CALYPTR^ID^J. 105 



[Genus GALERICULUS, Seeley. 



This genus has two distinct septa, the larger one originating 

 below the incurved apex, the smaller one at the base. Only the 

 cast is as yet known ; the shell has the form of a Helcion, but 

 its upper surface has not been observed. G. altus, Seeley 

 (S. and S. Conch., t. Ixiv, f. 79). Cretaceous.] 



Genus CAPULUS, Montfort, 1810. 



Shell conical, provided with epidermis, apex posterior and 

 directed to the right, more or less spirally curved ; aperture 

 basal, the lip continuous, no interior process, the horseshoe- 

 shaped muscular impression on the inner wall. 



Animal with lengthened rostrum ; tentacles subulate, with 

 the eyes on bulgings at their outer bases ; mantle margin 

 fringed ; foot suborbicular, simple ; gill-plume placed obliquely 

 across the mantle-cavity, the elongate linear laminae partly 

 exposed. Central tooth of the radula trapezoidal, the reflected 

 margin triangular, having a long sharp median and very fine 

 lateral cusps, laterals multicuspidate, marginals simple (PI. 30, 

 fig. 5). 



The few species inhabit the seas of Europe, the East and 

 West Indies, Western America, etc. Fossil, the genus com- 

 menced with the Silurian, and about twenty species are known. 



These animals are said to feed on the seaweed that grows 

 around them, and on small marine organisms. They appear to 

 have but limited locomotion, being usually adherent and modi- 

 fying the margin of the aperture of the shell according to the 

 surface on which they live. Sometimes they wear away the 

 surface beneath their foot, forming shallow excavations, or they 

 secrete an imperfect shelly base by means of that organ. The 

 egg-cases are membranous and are attached in a tuft at the 

 front of the foot under the neck. 



PileopsiSj Lam., 1812, and Actita, Fischer de Waldheim, are 

 synonyms. 



Section CAPULACM^A, M. Sars. 



Shell thin, patelliform, with thin epidermis; apex not spiral, 

 somewhat inclined to the right and posteriorly. Boreal Seas. 

 Piliscus, Love'n, 1859, and Pilidium, Midd., not Forbes, are 

 synonyms. 



