TESTACEA. 35 



ThOi shell of the preceding animals is generally simply conical, con- 

 tracting gradually upwards, and terminating in a vertex. Some others 

 decline with less uniformity and regularity, and terminate in different 

 kinds of recurvature. 



The character of the preceding animals is also in common corre- 

 spondence. The form of the Limax, however, is very variously modified, 

 as well as the tenement wherein it dwells. 



It would be vain to attempt accounting for such diversities, con- 

 sidering that its ductile body may be moulded to almost any form ; and 

 that its expansive and contractile Hiculty precludes its restriction to 

 special space. 



PiLEOPSis HuNGARicA — Plate VII., Figs. 10, 11, 12. 



Shell nearly circular in the orifice, the diameter of which is about 

 an inch ; summit shghtly recurved, obtuse ; height about half an inch, 

 striated down from the summit. 



Two stout tentacula originate from the head of the animal, with an 

 eye seated on the side of each. They become more slender nearer the 

 extremities. 



The animal was very inactive, remaining long stationary. One 

 specimen survived about six months. 



Pelagic : rare. 



Plate VII. 



Fig. 10. Pileo^ms Hungarica, animal, under surface. 

 11. Anterior portion, somewhat enlarged. 

 J 2. Shell. 



Velutina I/^vigata. — Plate VII., Fig. 13, 14. 



It is doubtful whether this subject be one in transition to the flat- 

 tened spiral shells, to the animals of which its tenant bears much resem- 

 blance. 



