120 



POPULAR CONCHOLOGY. 



Galerus sinensis. 



front; tentacula long, the eyes placed at less than one- 

 third of their length. 



The type of this genus is Calyptraa radians of Des- 

 hayes. 



Galerus. Gray. (Calyptraea Lam. part.) — Shell 

 conical, with circular base, and showing 

 outwardly no windings; the axis cen- 

 tral, and within a horizontal partition, 

 which is obliquely spiral. The type is 

 Calyptraea sinensis ; the animal of which 

 Forbes thus minutely describes : — A 

 broad and slightly produced muzzle ; 

 tentacula two, rather short, lanceolate, 

 unconnected, with the eyes on bulgings at their external 

 bases ; mantle with a simple edge ; branchial plume single ; 

 foot suborbicular, slightly angled in front ; its sides plain ; 

 tongue constituted as in Pileopsis (?). 



The British species G. (Calyptraea Lam.) sinensis is 

 abundant in the British Channel, and on our south coasts. 



Crepidula. Lam. (Sandalium Schum. ; Crypta Gray.) 

 — Shell irregular in shape, convex 

 at the back, but very flat ; the 

 inside partly covered with a plate, 

 so as to resemble a half-decked 

 boat; apex near the edge at one 

 end. Animal not differing very 

 considerably from Galerus sinensis, 

 as above described by Forbes. — 25 species; also fossil. 



This is a curious and often a very beautiful shell. The 

 Crepidula Onyx is of the most brilliant black in the in- 

 side, with the little half-deck, as it may be called, of a 

 beautiful white, and having the margin of the shell tinged 

 with a rich brown. These shells are found on rocks, and 



Crepidula. 



