Class VI. NAUTILUS. SAIL-SHELL. 247 



Gm. Lin. 3370. Mont. Test. Br. 18?. Sup. 6. CRISPDS. 



Lin. Tr. viii. 115. . /. 18. /. 5. 



* N. with a spiral shell; half heart-shaped 

 aperture ; spires connected ; about twenty 

 joints, crenated; minute; inhabits the sea. 



Devonshire, Dorsetshire, and on the south 

 coast of JVales. 



Gm. Lin. 3370. Mont. Test. Br. 186. id. 7- BECCARU. 



Lin. Tr. viii. 1 16. Sup. 74. t. 18. /. 4. 



* N. with a spiral shell, aperture obovate, vo- 

 lutions four or five, swelling, connected ; joints 

 furrowed. 



Inhabits the sea. ' ' . 



* N. with the volutions reversed ; agrees with var. b. 



' PERVERSUS. 



the preceding in every other respect. 



Mont. Test. Br. Sup. 81. /. 18. /. 3. 8. INFLATUS. 



* N. with a spiral, brown, opaque shell, ^^ith 

 three lobated volutions ; the anterior end sub- 

 globose ; minute. 



Sand on the coast of Drcon ; rare. 



