REPORT ON THE LAMELLIBRANCHIATA. 141 



a conspicuous impressed line. Tlie hinder dorsal slope is .a little arched, oblique, and 

 longer than the anterior, which is also feebly curved and a trifle more descending. The 

 front lateral margin is regularly well curved ; the posterior a little more acutely, which 

 is more marked as tlie shell increases in size. The lower outline is an even Ijroad 

 curve. Hinge rather similar to that of the European Circe minima, but differs in 

 having the hindmost tooth in tlie right valve, and the central one in the left thicker 

 and bifid. The ligamental groove is elongate and narrow. The muscular scars are 

 large, and the pallial is large, triangular, reaches half across the valves, and terminates 

 in a rounded tip. 



Length 8^ mm., height 7, diameter 5 ; a smaller specimen is 5| long, 5 high, and 

 4 in diameter. 



A larger valve has come to hand since giving the above dimensions. It is 10 mm. 

 lono- and 9 high. 



Habitat. — Torres Strait, North Australia, at a depth of 3 to 1 1 fathoms. Also 

 Station 188, west of Cape York, North Australia, in 28 fathoms ; mud. 



Cijtherea (Dionc) lihiliiypinarum , Hauley. 



Cytherea ijhiUppinurnm, Hanley, Rec. Biv. Shells, p. 356, pi. xv. fig. 36. 



Cytherea pliilippinarum, Reeve, Conch. Icon., vol. xiv. fig. 4:7, a, h. 



Cythenea philippiiiarum, Sowerby, Thes. Conch., vol. iL p. 627, pi. cxxxvi. fig. 177. 



Merefrix philippinarum, Deshayes, Cat. Conchif. Brit. Mus., p. 39. 



Cyfliereu (Dione) j'hilippinarum, Rijmer, Monog. Venus, vol. i. p. 139, pi. xxxvii. figs. 2-2e 



(very exceUeut). 

 Cytherea inemlana, Philippi, Zeitschr. f. Malak., vol. viii., 1851, p. 72. 



Habitat. — Levuka, Fiji Islands, at a depth of 12 fathoms; and in Tahiti Harbour in 

 20 fathoms ; also at the Banda Islands, in shallow water. 



The only localities from which this pretty species appears to have been hitherto 

 recorded are the Philippine and Marquesas Islands, the former on the authority of Mr. 

 Cuming and the latter on that of Philippi. 



Circe, Schumacher. 



Circe .icrijJta (Linne). 



Venus scrip)fa, Linno, Syst. Nat., cd. 12, p. 1135. 



Circe script a, Sowerby, Thes. Conch., vol. ii. pi. csxxis. figs. 38-42. 



Circe scripfa, Reeve, Conch. Icon., fig. 1. 



Vcntig (Circe) gcri2jfa, Ro'mer, Monog. VeneriJse, vol. i. p. 193, pi. lii. fig. 1. 



Habitat. — Port Jackson, New South Wales, in 4 to 18 fathoms; and Torres Strait, 

 at a depth of .3 to 11 fathom?. 



