GQ6 



39. Artemis torrida (pi. cxlii. f. 46), Reere, Concli. Icon. 

 Artemis, pi. x. f. 60. 



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

 tantam excavata, costellis ad latera vix elevatis. 



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

 riblets not so much elevated and corrugated at the sides. 



Mouth of the river Gaboon, Western Africa. 



40. Artemis Africana (pi. cxhi. f. 48), Grai/, Analyst, 

 1838. "Dosin," AdansonF 



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

 concinne subundulatira sulcata ; sulcis ad latera elevatis, conver- 

 gentibus, posticc ad marginem areas ligamenti angulatim pro- 

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

 profunda. 



Nearly white, sometimes tinged with delicate pink, obliquely 

 elevated, with very sloping dorsal margins ; the ligameutal 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), PMlippi, Abbild. 

 C^i/i. pi. viii. f. 2. 



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

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

 ginem arese 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. Artemis Adansoni (pi. cxlii. f. 52), PJdlippi, Abbild. 

 Cj/ih. t. ii. f. 2. "Dosin," Adansoni 



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 la;vi, lanceolata, subexcavata ; 

 lunula parva, impressa. 



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

 ligameutal area not so much excavated nor so distinctly defined. 



Senegal. 



