PLATE XX. 



Fig. 1. Cerithiopsis Sigsbeean a Da\\; 10.5. Page 254. 



" 2. Cerithiopsis Martensii Dall ; 11.25. Page 255. 



" 3. Cerithiopsis crystallina Dall ; 16.0. Poor figure. Page 254. 



" 4. Cerithiopsis (Eumeta ?) subulata Montagu ; 14.25. Page 252. 



" 5. Cerithiopsis abrupta Watson ; 4.3. Page 257. 



" 5 a. Triforis triserialis Dall ; 8.25. Page 246. 



" 6. Triforis cylindrella Dall ; 6.5. Page 250. 



" 6 a. Triforis triser ialis Dall ; 15.5. Page 246. 



" 7. Mathilda yucatecana Dall ; 8.0. Page 266. 



" 8. Triforis triserialis var. intermedia Dall ; 11.0. Page 247. 



" 9. Triforis abrupta Dall ; 7.5. Page 249. 



" 10. Triforis longissima Dall ; 26.0. Page 246. 

 "11. Triforis bigemma var. hircus Dall ; 12.5. Page 249. 

 " 11 b. Triforis torticula Dall ; 10.5. Page 249. 

 "12. Triforis colon Dall ; 12.0. Page 247. 

 " 12 b. Triforis inflata Watson var. ibex Dall ; 11.0. Page 249. 



