480 CORIUGESDA. 



Page 33. line 9, for Macrocheilbs Hrbb read Macrochbiixs (? Polyphbmoprih) Hbbe. 



Page 33, line 36 ; page 33, line 13 ; page 34, line 6 ; page 49, line 36, for the terminal us or us, in specific 



names, read ww» or dm. 

 Page 34, lines 6, 15, for Pi.blro.vbma read Callonbma. 

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

 Page 38, line 4, for obsolbta read obsolbscbhr. 



Page 39, line 19, and page 40. line 18, for attemcata read einaeeratum. 

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

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

 Page 46, 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 66, line 2, before decollated insert usually. 

 Page 60, line 3, 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. T. 

 Page 90, last line, add below Hydraulic beds. 



Page 99, line 4, for hyalisa read hyali.ius ; also in Explanation of Plate XXVI. 

 Page 100, line 3, for FIGS. 3-6 read FIGS. 3-10. 

 Page 102, line 13, for trillrata read triliratus. 

 Page 119, line 6, for 19-24 read 19-23. 



Page 123, line 6, for Subcbsds Cyrtonblla 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, dtle reference to fig. 2. 



Page 187. line 1, for acici llm read aciccla j also in Explanation of Plate 32 A. 

 Page 190, line 19, for gracilis read gracilb ; 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 JStofos. 

 Page 243, line 6, for obliquum read vastator. 

 Page 204, Hue 17, add Pratt's Falls, Onondaga county, N. Y. 

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

 Page 359, line 3, for Nautilus liratum read Nautilus liratus ; line 35, for Nautilus subliratum rend 



Nautilus sul >liratus. 

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

 Page 375, line 35, for Q. citum read C. cilum. 

 Page 433, line 24, for aquicostatus 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 prim*ves, likata and COXOOTA read prim*vum, liratdm and concinnum. 



Explanation of Plate XIII, change termination of species, except the 5th, 9th and 11th, to vm. 



Ktplanation of Plate XXV, refer Brllrhophon obsoletts to page 128. 



Explanation of Plate XXVI, refer Bbllrrophon kbpbrti's to page 128; and B. Lbda to page 110, 



instead of page 120. For B. trilbbatds, juvens, read B. triliratus, juvenis. 

 Explanation of Plate CXI, for GoRiocKRAst pandum read Tbochoceras 1 (Goniocbras 1) pandum, as in text, 



page 403. 



