LEPETA. 251 



coloured specimens; and the 2nd is Zetlandic. I am 

 not aware that T. fulva has been found fossil in this 

 country. Mr. Searles Wood^s specimens from the 

 Coralline Crag^ which he described as this species, ap- 

 pear to belong to Lepeta casca. Sars has enumerated it 

 among the shells from the older and newer glacial for- 

 mations near Christiania ; in the former at a height of 

 400-440 ft., and in the latter at 120 ft. Its foreign 

 habitat is entirely Scandinavian, and comprises all that 

 coast between Finmark and Bohuslan, its bathymetrical 

 range extending from 10 to 160 f. 



The animal swims or floats in an inverted posture, 

 but slowly. Its lingual apparatus does not seem to 

 differ materially from that of T. testudinalis or T. vir- 

 ginea. In all of them the central teeth are square, and 

 the laterals elongated and hooked. T. fulva, however, 

 has but a single row, while each of the other two 

 species has a double row of central teeth. The shell is 

 often encrusted by zoophytes and sessile Foraminifera. 

 It differs from T. virginea in texture, colour, and 

 sculpture. It is never so large as that shell ; my finest 

 specimen is ^oths of an inch long. 



This is the Patella Forbesii of James Smith. 



Genus IV. LE^PETA^ Gray. PL Y. f. 6. 



Body depressed : mantle thick-edged : tentacles short : eyes 

 wanting : foot thin. 



Shell conical, somewhat depressed, furnished with tuber- 

 culated striae, which radiate from the crown, and arc crossed 

 by concentric lines : heak in the embryonic state curved, and 

 always inclining towards the rear ; crown nearly central : 

 palUal scar j^laced within the margin. 



Indicated and named by Gray ; defined by H. and 



* Possibly derived from Lepas, the ancient name of the Umpet, 



