ADDENDA.

(REFERENCES TO PLATES XXVI-XXX.)

NOTE. The printing of the text of the Gasteropeda before the completion of Plates XXVI-XXX, has necessitated the following additional references:

Page 14, line 19, add PLATE XXIX, FIG. 8.

Page 16, line 7, add PLATE XXVIII, FIG. 20.

Page 27, line 19, add PLATE XXVIH, FIG. 16.

Page 33, line 17, adı PLATE XXVIII, FIG. 17.

Page 40, line 2, add PLATE XXVIII, FIG. 5; line 22, add PLATE XXVIII, FIG. 4.

Page 43, line 20, add PLATE XXVIII, FIGS. 1-3.

Page 44, line 2, add PLATE XXVIII, FIG. 8.

Page 45, line 2, add PLATE XXVIII, FIGS.*6, 7, 7 a.

Page 47, line 2, add PLATE XXVIII, FIG. 15.

Page 51, line 7, add PLATE XXVIII, FIGS. 18, 19.

Page 55, line 6, add PLATE XXVII, FIGS. 1-4; PLATE XXIX, FIG. 7.

Page 56, line 28, after PLATE XXVII, add FIG. 8.

Page 62, line 11, add PLATE XXVII, FIGS. 5, 6.

Page 64, line 3, add PLATE XXX, FIGS. 26, 27.

Page 67, line 2, add PLATE XXX, FIGS. 10, 11, 23, ? 24.

Page 69, line 2, add PLATE XXX, FIGS. 8, 9.

Page 73, line 18, for XXVIII read XXX, FIGS. 15-17.

Page 74, lines 17, 18, for plate 28 read plate 30.

Page 76, line 8, add PLATE XXX, FIG. 2.

Page 79, line 2, add PLATE XXX, FIG. 13.

Page 80, line 12, add PLATE XXX, FIG. 1.
Page 81, line 19, add PLATE XXX, FIG. 3.
Page 85, line 8, for FIG. 19 read FIGS. 4, 19.

Page 86, line 2, for FIG. 18 read FIGS. 12, 18.

Page 87, line 2, for FIG. 25 read FIGS. 5, 25; line 20, for FIGS. 20, 21 read FIGS. 6, 20, 21, 22.

Page 92, line 17, for PLATE XXVIII read PLATE XXX.

Page 93, line 8, add PLATE XXX, FIG. 28.

Page 95, line 14, add PLATE XXVI, FIG. 1.

Page 100, line 3, add PLATE XXVI, FIGS. 10-12.

Page 106, line 6, add PLATE XXVI, FIG. 18.

Page 110, line 17, add PLATE XXVI, FIG. 24.

CORRIGENDA.

Page 3, line 26, add PLATE II, FIGS. 30, 31.

Page 17, line 18, dele “and P. dumosum:” line 19, should refer only to plate 7.

Page 21, line 7; page 22, lines 3, 22; page 23, lines 1, 12, 21, 27, 30; page 24, lines 1, 20, 27; page 25, lines 15, 18; page 26, lines 7, 19; page 27, lines 11, 18; page 28, line 16; page 29, lines 7, 12, 17, 21, 25; page 31, line 8; page 35, line 23; page 36, line 27; page 38, lines 4, 21; page 39, line 21; page 40, lines 1, 21; page 41, lines 7, 14, 24; page 42, lines 13, 19; page 43, lines 10, 14; page 44, lines 1, 18; page 46, lines 1, 23; page 49, line 5; page 50, lines 9, 17, 35; page 51, lines 1, 6; page 52, line 18; page 53, line 4, for the terminal a or A, in specific names, read um or UM.

Page 32, line 9, for MACROCHEILUS HEBE read Macrocheilus (? Polyphemopsis) Hebe.

Page 32, line 26; page 33, line 12; page 34, line 6; page 49, line 26, for the terminal us or us, in specific names, read um or Uм.

Page 34, lines 6, 15, for PLEURONEMA read CALLONEMA.

Page 37, line 1, for -iltonia read -iltonia.

Page 38, line 4, for OBSOLETA read OBSOLESCENS.

Page 39, line 19, and page 40, line 18, for attenuata read emaceratum.

Page 40, line 2, for FIGS. 1-6 read FIGS 1-3.

Page 44, lines 16-17, for Upper Helderberg read Hamilton."

Page 45, line 27, for delphicola read Delphicola.

Page 47, line 1, for DELPHICOLA read DELPHICOLA.

Page 52, line 20, add to Ohio river, below hydraulic beds.

Page 56, line 2, before decollated insert usually.

Page 60, line 2, for 16-18 read 17, 18.

Page 67, line 11, for anterior read external.

Page 69, line 20, for coronate read carinate.

Page 70, line 14, for Upper Helderberg read Hamilton.

Page 78, last line, add and in the Chemung group, at Ithaca, N. Y.

Page 90, last line, add below Hydraulic beds.

Page 99, line 4, for HYALINA read HYALINUS; also in Explanation of Plate XXVI.
Page 100, line 3, for FIGS. 3-6 read FIGS. 3–10.

Page 102, line 13, for trilirata read triliratus.

Page 119, line 5, for 19-24 read 19-23.

Page 123, line 6, for SUBGENUS CYRTONELLA read CYRTONELLA, n. subgen.

Page 145, line 31, for crassicostata read crassicostatus.

Page 158, line 29, for 159 and 165 read 161 and 167.

Page 179, last line, for gracilistriata read gracilistriatus.

Page 180, line 2, dele reference to fig. 2.

Page 187, line 1, for ACICULUM read ACICULA; also in Explanation of Plate 32 A.

Page 190, line 19, for GRACILIS read GRACILE; also in Explanation of Plate 32 A.
Page 194, line 26, for four read six.

Page 219, line 13, for infundibiliformis read infundibuliformis.

Page 226, line 23, for Casteln. read Stokes.

Page 243, line 5, for OBLIQUUum read vastator.

Page 294, line 17, add Pratt's Falls, Onondaga county, N. Y.

Page 352, line 20, for FIG. 2 read FIGS. 1, 2.

Page 359, line 2, for Nautilus liratum read Nautilus liratus; line 25, for Nautilus subliratum read Nautilus subliratus.

Page 360, line 24, for PLATE CXIV read PLATE CXI.

Page 375, line 25, for G. citum read C. citum.

Page 432, line 24, for æquicostatus read equicostatus.

Explanations of Plates IX and X, in first four species change the terminal A in species and varieties

to UM.

Explanation of Plate XI, in first two species make the above change.

Explanation of Plate XII, for PRIMÆVUS, LIRATA and CONCINNA read PRIMÆVUM, LIRATUM and CONCINNUM. Explanation of Plate XIII, change termination of species, except the 5th, 9th and 11th, to UM. Explanation of Plate XXV, refer BELLEROPHON OBSOLETUS to page 128.

Explanation of Plate XXVI, refer BELLEROPHON REPERTUS to page 128; and B. LEDA to page 110, instead of page 120. For B. TRILERATUS, juvens, read B. TRILIRATUS, juvenis.

Explanation of Plate CXI, for GONIOCERAS? PANDUM read TROCHOCERAS? (GONIOCERAS) PANDUM, as in text, page 403.