ERRATA. 



Page 2 line 5 from the top, for and Say, read Say and T. Peale. 

 5 8 for Opeculum, read Operculum. 

 7 7 for and Say, read Say and Peale. 

 53 1 for Webb, read Web. 

 3 do. do. 



130 8 after the word observed add a colon. 



12 after the word species insert a comma instead of a period. 

 170 5 for seven- twentieths read seven-tenths. 



7 for -whirls read whorls. 

 175 3 foi labrum read labium. 

 184 4 after ammonia insert a comma. 



11 for the first 100 read 150. 

 243 11 for w/»Wread -whorl. 



11 for s/»/ne read s/rcre. 



257 4 before pasilla insert NaUca. 



18 for N. read T. 

 262 18 for hirudo read hirundo. 

 267 19 for striahdus read striatulus. 

 272 15 before elevata insert V. 

 360 23 after egg add ". 



24 dele ". 



21 dele ". 



372 8 from the bottom for Harrigate read Harrowgate. 



373 3 dele *. 



12 fox Harrigate read Harrowgate. 



375 11 do. do. 



376 12 do. do. 



