C50 



Shell always deeper from apex to ventral margin than the last 

 species ; a distinct posterior area, with beaded ribs very diverging, 

 then two or three broad beaded ribs, with distinct intervals reach- 

 ing from top to bottom ; the rest of the ribs rather smaller, bi- 

 furcated, and at the anterior side very diverging. 



Philippine Islands ; Cuming. Also Eed Sea. 



3. Circe divaricata (pi. exxxvii. f. 8, 9), Gmelin. 



Cir. testa subelongata, depressa, postice subacuminata ; costis 

 vix noduhferis, numerosis, postice obliquis, medio radiatis, prope 

 angulum posticum acutangulatim confluentibus. 



Shell like C. pectinata, but more oblique and acuminated pos- 

 teriorly, and the ribs, which are small and comparatively smooth, 

 unite more gradually and obliquely near the posterior angle. 

 The colouring is arranged in broad angular patches rising over 

 each other, and forming grotesque figures. Fig. 9 a, the ribs 

 form a series of acute angles at their posterior confluence ; Mr. 

 Sowerby's specimen. 



Eed Sea. Mozambique ; Hanley. Philippines ; Cuming. 



4. Circe jEQtjivoca (pi. exxxvii. f. 12, 13, 14, 15), Chem- 

 nitz (Venus), f. 1980. Cytheraa testudinalis, Lamarck, no. 67. 

 Var. C. placunanella, Lamarck, no. 69. C. cuneata, C. mixta, 



Lamarck ? 



Cir. testa plerumque alta, postice subobliqua, antice concen- 

 trice subsulcata, ; costis parvulis, numerosis, in medio acutangu- 

 latim divaricatis ; colore nonnunquam ad margines lineari. 



The ribs are generally finer than in the other species, the 

 posterior and anterior ones meeting in very acute angles near the 

 middle of the shell. 



Red Sea. 



5. Circe dispar (pi. exxxvii. f. 10, 11), Chemnitz, vol. xi. 

 t. 202. f. 1981, 1982. Cythersea muscaria, Lamarck, no. 59. 

 Cyth. pulicaria, Lamarck, no. 60. 



Cir. testa, rubro-punctata et angulatim variegata ; postice costis 

 divaricatis, antice concentricis. 



In some of the flatter varieties of the preceding species the 

 anterior rays are so crossed by concentric lines, that it is not easy 



