KEPORT ON THE LAMELLIBRANCHIATA. 133 



It has been recorded from the south uud west coasts of Enghuid, tlie coasts of France and 

 Portugal, throughout the Mediterranean, and from the Canary Ishmds. It is also found 

 fossil in the Coralline Crag and in the Tertiary formations of Italy and Sicily. 



Cytherea (Callista) rutila, Sowerby. 



Cijtherea rutila, Sowerby, Thes. Concb., vol. ii. p. 743, pi. clxiii. fig. 20-5. 

 Diow rutila, Reeve, Couch. Icon., fig. IS. 

 . Dione rutila, Deshayes, Cat. Conchif. Brit. Mus., p. 58. 



Habitat. — Station 162, off East MonccBur Island, Bass Strait, at a depth of 38 to 40 

 fathoms ; sand and shells. 



The following are the measurements in millimetres of three specimens in the Cumin- 

 gian collection and the single valve (the smallest) from the above locality. 



In many respects Cytherea rutila resembles Cytherea cliemenensis, and, indeed, at 

 one time I was inclined to consider them forms of one and the same species, which may 

 yet be shown to be the case. The former, judging from the three large specimens and a 

 fourth in the young state in the Cumingian collection, is not so long as the latter 

 species, smoother, has large blotches on the hinder dorsal slope, and a slightly more 

 elongate lunule, and appears to attain a larger size. The brown rays are frequently 

 interrupted or partially concealed by broad and narrow concentric pale zones. Another 

 distinction is the absence of the purple ray which occurs in Cytherea diemenensis. The 

 two young odd valves from Station 162, off East Moncoeur Island, and a small specimen 

 in the Cumingian collection, are rather more elongate than the typical form. 



Cytherea I^CaUista) lilaeina, Lamarck. 



Cijtherea lilaeina, Lamarck, Anim. sans vert., ed. 2, vol. vi. p. 303, No. 15. 



Cytherea lilaeina, Hanley, Rec. Shells, p. 98, pi. xv. fig. 12. 



Cytherea lilaeina, Sowerby, Thes. Conch., vol. ii. pi. cx.xx. fig. 74. 



Dione lilaeina, Reeve, Conch. Icon., vol. xiv. fig. 5. 



Cytherea (Callida) lilaeina, Rbmer, Monogr. Venus, vol. i. p. 61, jil. xviii. figs. 2-2t. 



Cytherea pectoruli)-, ? Lamarck, loc. eit., p. 304. 



Cytherea pectoralis, Sowerby, loc. cit, pi. cxxx. fig. 75. 



Dione grata, Deshayes, Cat. Conchif. Brit. Mus., p. 62. 



Dione grata. Reeve, loc. eit., fig. 14, a, b. 



Cytherea (Callista) grata, Romer, loc. cit., p. 64, pi. xix. fig. 5. 



Habitat. — Station 212, south of the Philippine Islands, in 10 to 20 fathoms ; .sand. 



