673 



formibus cinctfi; ligamento cons])icuo, iterum lamellis spinse- 

 formibus circumdato." 



White, rather squarish, and remarkable for a deeply-impressed 

 line dividing off a portion of the dorsal edge ; near this line the 

 concentric ridges are laminated and produced into points. 



Catauuau, island of Luzon, Philippines ; in fine sand at low 

 water. Cuming. 



65. Artemis striatissima (pi. cxliv. f. 71-84), Sowerby, 

 junior. 



Art. testa subrotundata, alba, radiatim minutissime striata, 

 concentrice costellata; costellis parvis, subdistantibus ; margine 

 dorsali linea impressa aream elevatam circumscribente ; lunula 

 tumida, margine profundi; impresso. 



More rounded than A. pubescens, with the concentric ridges 

 more distant and less produced at the margins, and with fine ra- 

 diating striaj. It resembles that species in having a defined sup- 

 plemental area. 



Locality unknown. In Mr. Cuming's collection. 



Sect. 7. Dorsal area laminated in one valve, smooth in the 



other. 



66. Artemis rota (pi. cxliv. f. 77), Lamarck (Cytheraa), 

 sp. 37. 



Art. testa rufa, varie albo-radiata et interrupta, rotundata, sub- 

 ventricosa, crassa, concentrice subplano-costata ; costellis ad la- 

 tera elevatiusculis : lunula brevi, plana, impressa, dorso rotundato ; 

 area ligamenti striata, planiuscula, excavata. 



Rounded, rather ventricose, thick, concentrically ribbed; the 

 ribs flattened in the middle and slightly elevated at the sides. 

 Ligamental area striated, rather flattened and hollowed out. 



Locality unknown. 



67. Artemis juvenilis (pi. cxliv. f. 74, 75, 76), Gmelin 

 (Venus), Syst. Nat. p. 3287. V. juvenis, Chemnitz. 



Art. testa alba, rufo late intcrruptim et varie radiata, rotun- 

 data, compressa, concentrice costata ; costellis in medio planatis, 

 ad latera paucis, laminatis, elevatis ; lunula brevi, impressa ; area, 

 ligamenti angustata, striata, paululum excavata. 



The dorsal margin is less rounded than in A. rufa; the shell 



