480 
CORRIGENDA. 
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 dm. 
Page 34, lines 6, 15, for Pleuronema read Callonema. 
Page 37, line 1, for -iltonia read -iltonice. 
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 infun dibi l if or mis read infundibuliformis. 
Page 226, line 23, for Casteln. read Stokes. 
Page 243, line 5, for obliquum read vastator. 
Pag-e 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 Gr. citum read C. citum. 
Page 432, line 24, for wquicostatus 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 primievus, lirata and concinna read primjevum, liratum and concinnum. 
Explanation of Plate XIII, change termination of species, except the 5th, 9th and 11th, to um. 
Explanation of Plate XXV, refer Belleropiion obsoletus to page 128. 
Explanation of Plate XXVI, refer Belleropiion 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 1 (Gonioceras ?) pandum, as in text, 
page 403. 
