660 



Art. testa subtrigoiia, lata, crassiuscula, alba, fermgineo-tincta, 

 concentrice irregulariter striata; area ligamenti simplici; lunula 

 amplissima, vL\ distincta. 



I think it is erroneous to place tliis species in the genus Cij- 

 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, 



Eed Sea. 



17. Aktemis subtrigona- (pi. cxli. f. 21), Sowerbi/,jun. 



Art. testa albida, tenui, subtrigona, tenue et confertim elevatini 

 striata ; area ligamenti paululiim 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 hue. The ligamental area not very distinctly 

 depressed. 



Locality unknown. In Mr. Sowerb/s collection. 



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

 Abbild. Cyth. p. 36. pi. viii. f. 5. 



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

 centrice minute et acute striata ; area ligamenti paululiim exca- 

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

 gines et lunida violaceis, intiis 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 simphci ; lunula 

 ampla, vix impressa. 



A small wliitish 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. 



Locahty unknown. In Mr. Cuming's cabinet. 



