REPORT ON THE LAMELLIBRxVNCHIATA, 211 



Cardita canaliculata, Eeeve. 



Cardita canaliailafa, Reeve, Conch. Icon., vol. i. fig. 40. 



Cardita cardioides, Reeve, he. cit, fig. 49. 



Oardita mmingii, Deshayes, Proc. Zool. Soc. Lend., 18.52, p. 102, p], xvii. fig. 1.5. 



Habitat. — Station 212, Malanipa, Basilan Strait, Philippine Islands, in 10 fathoms; 

 .sand. 



On closely comparing the above forms, I fail to appreciate any just grounds for their 

 separation. Cardita crermlata, Deshayes, is also very similar, and will in all probability 

 eventually prove to be but a slight variety, the hinge being exactly the same in all. 



Cardita beddomei, n. sp. (PL XV. figs. 5-5a). 



Testa insequilateralis, subtrigono-rotundata, crassiuscula, mediocriter convexa, albida, 

 postice rufo notata, costis tenuibus radiautibus nodulosis circa 25 (sulcis intervenien- 

 tibus subfequalibus) instructa : margo dorsi posticus valde declivis, vix curvatus, 

 ventralis parum arcuatus. Umbones promineutes ; lunula parva, cordata, laevis. 



Var. Testa magis quadrata, costis circa 27 instructa. 



This species is considerably inequilateral, moderately convex, thickish, trigonally 

 rounded, whitish and dotted and spotted with a reddish colour down the posterior side. 

 It is ornamented with about twenty-five fine radiating ribs, which are either equal to the 

 intervening sulci or rather broader, and covered with numerous small nodules or solidi- 

 fied scales which are more or less compressed, especially those near the ventral margin. 

 The beaks in the typical form are well raised, so that the dorsal margins become very 

 oblique on both sides. The posterior is long and only very slightly excurved, the 

 anterior in the region of the small cordate smooth lunule being a little excavated. 



The interior is white, with a tinge of pale red towards the umbones. 



Length 17 mm., height 16, diameter 11. 



Habitat. — Station 162, oflf East Moncceur Island, Bass Strait, in 38 to 40 fathoms. 



In the British Museum there are two or three specimens dredged in Bass Strait by 

 Macgillivray during the voyage of the " Eattlesnake " which slightly vary from the 

 Challenger specimen. They are rather more quadrate, and have a few additional costa;. 



This species closely resembles Cardita bimacidata of Deshayes from New Zealand, 

 but has more numerous ribs, less epidermis, a shorter lunule, and lacks the orange colour 

 on the muscular impressions. 



Cardita bimaculata, Deshayes. 



Cardita bimaculata, Deshayes, Proc. Zool. Soc. Lend., 1852, p. 102, pi. xvii. figs. 4, 5. 

 Testa subquadrata, valde insequilateralis, modice convexa, albida, pallide rufo punctata. 



