276 HALIOTID^. 



Lamarckj C. succinea, Risso^ C.Polii, Sc^cchi, C. vulgaris, 

 Philippic and C. mamma, Krynicki fide Middendorff. 



Crepidula sinuosa of Turton was included by him in 

 the catalogue of British shells^ in consequence of Mr. 

 Bean having taken specimens at Scarborough, " from 

 the bottom of a ship just arrived from North America/^ 

 It is the C. j)lana of Say; but I question its being iden- 

 tical with the Patella crepidula of Linne or C. ungui- 

 formis of Lamarck, as was supposed by Sowerby and 

 Gould. 



Family V. HALIO'TID^, Fleming. 



Body oblong, depressed, partly spiral : mantle puckered in 

 small folds at intervals on the right hand : head broad, with 

 a short snout : tentacles filiform, long and tapering, separated 

 by a fringed lobe or membrane, which forms a head-veil : ei/es 

 placed on cyhndrical, but short, stalks at the outer bases of the 

 tentacles : (/ills two, unequal in size : foot extremely large, 

 thick and fleshy, encircled by a double row of festoons. 



Shell ear-shaped, nacreous, pierced on the right side by 

 a series of holes, which are closed in the course of growth, 

 after ceasing to be of use in containing the pallial folds ; the 

 hole last formed commences as an open notch : sjnre very short, 

 placed on the left side, although almost terminal : mouth ex- 

 tremely large and open, occupying nearly the whole of the 

 base ; borders curved, that on the right being thick, and 

 the other thin : inside highly iridescent. 



This family has several points of relationship to the 

 Fissurellidce ; but the shape is different, the orifices are 

 numerous, and the shell is remarkably nacreous. There 

 appears to be a homogeneity between all the genera or 

 members of the Haliotidce, making it difficult to dis- 

 tinguish one from another. We have only the typical 

 genus. 



