(Hill 



Art. testa subtrigona, lata, crassiuscula, alba, ferrugiueo-tincta, 

 concentrice irregulariter striata; area ligamenti simplici; lunula 

 amplissima, vix distincta. 



I think it is erroneous to place this species in the genus Oy- 

 thercm, for, notwithstanding its trigonal form, it has the essential 

 characters of Artemis. It is ribbed, of a white colour, tinged 

 with rusty-brown. The lunule is very broad and scarcely marked, 

 and the area is simple. 



Bed Sea. 



17. Artemis subtrigona (pi. cxli. f. 21), Sowerby,jun. 



Art. testa albida, tenni, subtrigona, tenue et confertim elevatim 

 striata ; area ligamenti paululum depressa ; lunula magna, laevi- 

 gata, vix distincta. 



Rather white, thin, of a subtrigonal form, with very fine, close, 

 concentric riblets. The lunule is large, circumscribed by a 

 faintly impressed bne. The ligamental area not very distinctly 

 depressed. 



Locality unknown. In Mr. Sowerby^s collection. 



IS. Artemis isocardia (pi. cxli. f. 29, 30), Bunker, Phil. 

 Abbild. Cyt/t. p. 36. pi. viii. f. 5. 



Art. testa glauca, violaceo-tincta, alta, cordata, gibbosa, con- 

 centrice minute et acute striata; area ligamenti paululum exca- 

 vata ; lunula cordata, subimpressa. Variat fusco-maculata, mar- 

 gines et lunula violaceis, intus purpurea. 



Heart-shaped, narrow, and ventricose; greyish-buff, tinged 

 with purple ; finely, evenly, and sharply striated ; lunule defined 

 by a slightly depressed line ; ligamental area rather excavated. 



Guinea. 



19. Artemis nanus (pi. cxli. f. 31), Reeve, Conch. Icon. Ar- 

 temis, pi. x. f. 57. 



Art. testa sordide alba, subcordata, subgibbosa, concentrice 

 costata, costis acutis, validis; area ligamenti simplici; lunula 

 ampla, vix impressa. 



A small whitish shell, with the ridges very large in proportion 

 to its size, and the lunule occupying a large part of the anterior 

 side. There is no distinctly marked ligamental area. 



Locality unknown. In Mr. Cuming's cabinet. 



