666 



39. Artemis toriuda (pi. cxlii. 1'. 46), Reeve, Concli. Icon. 

 Artemis, pi. x. f. 60. 



Art. testa A. Orbignii simili, sed latiore ; area ligamenti baud 

 tantum excavata, costellis ad latera vix elevatis. 



It is not unlike A. Orbiginii, but it is not so high and the 

 riblcts not so much elevated and corrugated at the sides. 



Mouth of the river Gaboon, Western Africa. 



40. Artemis Africana (pi. cxlii. f. 48), Gray, Analyst, 

 1838. "Dosin," Adanson? 



Art. testa pallide fulva, crassa, oblique elevata, concentrice 

 concinne subundulatira sulcata ; sulcis ad latera elevatis, conver- 

 gentibus, postice ad marginem area? ligamenti angulatim pro- 

 duces ; area ligamenti planulata, late excavata ; lunula distincta, 

 profunda. 



Nearly white, sometimes tinged with delicate pink, obliquely 

 elevated, with very sloping dorsal margins ; the ligamental area 

 excavated and flattened, and defined by the acutely produced 

 ridges, which are elevated and convergent at the sides, and 

 smooth and shining at the central disc. 



Senegal. 



41. Artemis Gruneri (pi. cxlii. f. 47), Pkilippi, Abbild. 

 CytL pi. viii. f. 2. 



Art. testa pallide fulva, crassa,, subelevata, concentrice valide 

 sulcata ; sulcis ad latera elevatis, convergentibus, postice ad mar- 

 ginem areas ligamenti angulatim productis ; area ligamenti planu- 

 lata, late excavata ; lunula distincta, valide impressa. 



Broader and coarser than A. Africana, and not so obliquely 

 elevated towards the umboes. 



China. 



42. Autemis Adansoni (pi. cxlii. f. 52), PMlippi, Abbild. 

 Cyth. t. ii. f. 2. "Dosin," Adanson? 



Art. testa albida, versus umbones subrosea, suborbiculari, sub- 

 compressa, concentrice minute striata, striis ad latus posticum 

 angulatim elevatis, utrinque undulatim convergentibus ; margine 

 dorsali subelevato ; area ligamenti lasvi, lanceolata, subexcavata ; 

 lunula parva, impressa. 



liounder, flatter, and smoother than A. Gruneri or A. Africana; 

 ligamental area not so much excavated nor so distinctly defined. 



Senegal. 



