Class VL NAUTILUS. SAIL-SHELL. 251 



Mont. Test. Br. Sup. 86. t. IQ. f. 5. 20. spinu- 



losus. 



* N. with a shell with three globose articula- 

 tions of a pale chesnut color, covered with 

 reflected spines ; minute. 



Mont. Test. Br. Sup. 86. 21. bicari- 



NATUS. 



* N. with a subcylindric shell, bent, having 

 eleven subglobose bicarinated orbiculations ; 

 minute. 



Mont. Test. Br. Sup. 87. t. 30. /. 9. 22. linea- 



ris. 



# N. with a strait smooth glossy shell, some- 

 what tapering, a little compressed, with faint 

 ribs at the smaller end ; minute. 



