ORDER GASTEROPODA. 



55 



coast of Africa, &c. It is rather a handsome shell, 

 which seldom exceeds an inch and a half in length. 



Umbrella Crcphhda Fissurella 



Mediterranca. unguiformis: nimhosa. 



The Fissurella very much resembles our limpet, but 

 differs from it by having a small, rather oval -formed 

 hole in the summit of the shell, affording a passage to a 

 small canal through which the water is discharged, after 

 having passed over the branchiEe. 



The Hu^^garian Bonnet Shell, 



{Pileopsis Ungarica.) 



The Pileopsis Ungarica is extremely elegant both in its 



form and markings; it is of a delicate white, slightly 



Pikopsls Ungarica. 



