228 ARISTOTLE'S ANAIMA. 



has a shell, has its coiled part uppermost, when the animal 

 is at the sm'face, and is not caused to sink by filling with 

 water. 



It does not seem to be possible to identify Aristotle's 

 marine animal having a shell like that of a snail. It may 

 be a gastropod, and Prof. E. Forbes suggested Carinaria 

 mediterranea* the shell of which is, however, very small 

 and not capable of containing the animal, when retracted. 

 A more satisfactory identification would be furnished by 

 gastropods of the marine genus Atlanta, in which the shell, 

 although small, is capable of containing the animal, while 

 the three lobes of the foot often project beyond the mouth 

 of the shell. There is nothing to show, however, that 

 Aristotle was acquainted with these gastropods. Nautilus 

 po7npilius, with which some have identified Aristotle's 

 animal, is not found in the Mediterranean. 



* Travels in Lycia, dc, vol. ii. p. 101. 



