268 cerithiopsid^e. 



at Loken in the south of Sweden, and Martin another 

 in the Gulf of Lyons. 



The animal crawls and swims actively and with ap- 

 parent ease. When at rest, it spins a fine transparent 

 thread, which issues from the opening in the centre of 

 the foot-sole, its end being attached by the point of the 

 toot to some foreign substance. I drew the shell up by 

 this thread with a camel's -hair brush, and kept it thus 

 suspended in the water for several seconds, the foot 

 being doubled up. Several other univalves and many 

 bivalves possess the same faculty of anchoring them- 

 selves. There are giants as well as dwarfs among the 

 shells of this species. My largest specimen is barely 

 3^ lines long ; but Mr. Norman has one from the Clyde 

 district measuring half an inch. 



Philippi described and figured it as Cerithium pyg- 

 maum, and Nyst as C. Henkelusii (afterwards Henkelii) ; 

 C. acicula and C. minimum of Brusina appear also to be 

 the same as our species. Cerithiopsis tuberculata of P. 

 Carpenter, from the west coast of North America, is dif- 

 ferent. " The elegant subpellucid white variety " no- 

 ticed by Montagu as having been found by Laskey near 

 Dunbar, was probably an exotic shell. 



2. C. Barlee'i* Jeffreys. 



Shell forming an elongated pyramid with a broadish base 

 (which is excavated), thinner than the last species, nearly 

 semitransparent, and glossy : sculpture, that of G. tubercularis, 

 except in not having any basal ridge, and in the whole surface 

 being marked by numerous microscopical lines of growth ; the 

 top whorls are also glossy, but the succeeding two, instead of 

 being smooth, are finely and closely striated in the direction 

 of the spire : colour pale yellowish-white, with a faint tinge 



* In memory of my late friend and brother conchologist, Mr. George 

 Barlee. 



