246 NAUTILUS. SAIL-SHELL. Ci^ass VI. 



rotatus. Lin. Tr. viii. 114. I89. /. 15. /. 4. id. Sup. 



N. calcar. Mont. Test. Br. 76. 



* N. with a spiral smooth shell ; aperture half 

 heart-shaped ; of six cells marked with elevat- 

 ed, flexuous stria ; ridge very entire ; minute. 

 Inhabits the sea. 



3. laviga- Lin. Tr. viii. 115. Mont. Test. Br. 188. id. 

 tulus. Sup. 75it f 18, f. 7, 8. 



* N. with a spiral shell and smooth joints; 

 minute. 



Inhabits the sea. 



4. depressu- Lin. Tr. viii. 115. Mont. Test. Br. 190. id. 



Lvs - Sup. 78. t. 18. f. 9. 



* N. with a spiral shell somewhat umbilicated 

 on the sides, joints numerous, depressed ; color 

 dull white ; minute. 



Found very rarely at Reculver in Kent. 



5. UMBILI- Lin. Tr. viii. 115. Mont. Test. Br. 191. id. 



CATULUS. 



Sup. 78. t. 18. /. 1. 



* N. with a spiral shell; umbilicated joints 

 furrowed ; minute. An inhabitant of the sea. 

 Sandwich. 



