STYLIFER. 227 



the length of the body-whovl ; the peritreme is incomplete, 

 and has a very thin margin ; at its superior junction with 

 the body it is slightly appressed and unites with it at a 

 rather acute angle; below, it widens out, and in the 

 lowest part is rounded with a slight obliquity towards 

 the axis. The pillar-lip is prominent, very slightly 

 thickened or marginated above, becoming thinner below ; 

 it is slightly reflected, and there is no trace of an umbi- 

 licus. 



The only account of the animal is contained in Mr. 

 Alder's Catalogue of the Mollusca of Northumberland 

 and Durham, " We lately obtained a specimen of this 

 species alive on the spines of an Echi7ius at Cullercoats, 

 but rather injured and in a very sickly state. We placed 

 it in a glass of fresh sea- water, hoping that it might recover 

 and display itself more distinctly ; but in this we were 

 disappointed, as it soon died, and being left unlooked for 

 awhile, had partially decayed. The animal was white, had 

 a rather large foot, without operculum, and a rounded 

 head with two cylindrical tentacles and minute eyes at the 

 (external or posterior) base. No portion of the shell was 

 covered by the fleshy parts, but we are not prepared to 

 say, that, in a state of vigour, the animal has not the 

 power of extending some part of the mantle or foot 

 over it." ^Ve have seen the preserved specimen. 



It was first discovered on the spines oi Echinus spJiitra 

 at Torbay. Dr. Johnston has taken it in a similar situa- 

 tion at Berwick, and Mr. Alder and Mr. E. Howse on the 

 coasts of Northumberland and Durham. Mr. Jeffreys 

 has it from Cork, where it was taken by I\Ir. J. D. Hum- 

 phreys. It must be regarded as a very rare shell ; we 

 have never met with it, though seldom has an Echinus past 

 through our hands without a search being made for the 



