S3 



This species appears to me to be the Nerita rufa of 

 Montagu, and agrees very well with the description 

 given by Phillippi of his Natica helicina, which he 

 refers with a query to Brocchi's species of that name. 

 Nearly allied to my shell, but at the same time very 

 distinct, is the Natica helicoides of Johnston. When 

 placed on its mouth, the Natica Montagui resembles 

 a Littorina. 



Order. Scutibranchia. 



Fam. Calyptracea. 



XLVIII. Capulus, Montfort. 

 1. hungaricus. 



Capulus hungaricus, Flem. — Patella hunga- 

 rica, Lin. — Plleopsis hungarica. Lam. 

 Animal white, tentacula long, filiform ; the eyes 

 on a bulging below their centres externally ; proboscis 

 brownish. 



Shell sometimes white, sometimes rose colour in^ 

 ternally. Common on shells and stones in deep water 

 on all the coasts. 



Fam. Patelloidea. 



XLIX. Emarginula, Lam. 

 1. fissura. 



Emarginula fissura, Lam. — Patella fissura, 

 Lin. 

 The animal is figured by Muller. 

 On the Pecten maxim us and Pecten opercularis, 

 and other shells : frequent. 



