CONCHYLIA— i}/THF/2.i. 55. 213 



Da Costa, p. 225, tab. 15, fig. 3. 



Donoi'cin, British Slieils, iii. tab. 73. 



Montagu, Test. Brit. p. 33. 



luiun. Trans, viii. p. 40. 



Turton, British Fauna, p. 146. 



Wood, Conch, p. 107, tab. 23, fig. 1-3. 



Diliwyn, Descript. Catal. p, 52. 



Turton, Conch. Diet. p. 106. 

 Musculus iiiger. Lister, Conch, tab. 149, fig. 4. 

 Mus. nost. In most rapid rivers. 



Shell two inches or more long, and four or five broad, covered 

 with a black wrinkled skin which fringes tlie margin ; inside 

 blackish-white mixed with green, with a blackish border round 

 the edge : the front margin a little contracted in the middle, 

 sivins: a somewhat curved outline to its fii-ure. 



Young shells have the interior marginal edge, under the liga- 

 ment, raised into a kind of laminar process ; but the teeth dis- 

 tinguish it from the last family, and the terminal cavity from 

 the next. 



55. ^lYfiCk— TURTON. 



Testa transversa, a-quirahHS, inecquilateralis, lateribus sub- 

 hianlibus ; umbonibns corrugato-verrucosis. Cardo dente 



2i 2 



