EEPORT ON THE LAMELLIBRANCHIATA. 217 



CarditeUa torresi, n. sp. (PL XV. figs. 8-8a). 



Testa parva, inajquilateralis, eonlata, alhida, rufu sparsim uotata, costis radiantiltus 

 tc'iiuibus (juiudcuis pulcherrime .s(|iiainulatis instructa. Lunula cordata, kevis, profunda ; 

 area dorsalis postica angusta, lanceolata, Ifevis, subprofunda. Margo dorsi posticus paulo 

 obli(iUus, rectus, anticus l)revior, concavus, lunida convexa interruptus. Latus anticiim 

 angustum, obtuse .sul)angulatuni, postieum subtruncatum. Cardo ut in ConUtella 

 angdsi. 



This pretty little species is rather convex, somewhat cordate, narrowed in front, Ijroad 

 and sulitruucatc behind. It is whitish and sometimes spotted more or less with red. 

 The sculpture consists of fifteen fine well-raised radiating ribs, which are beset with 

 numerous small arched scales. The interstices between the ridges are fully twice their 

 width, and exhibit strong wrinkled lines of growth and frequently a feeble radiating lira 

 on each side of the costse. The posterior dorsal slope is straight, and only a little oblique, 

 the anterior, on the contrary, jjeing very suddenly sloping and concave except where the 

 small smooth cordate lunule projects a little along its central line. The hinder slope 

 exhibits a narrow lanceolate smooth dorsal area which is also somewhat sunken. The 

 umbones are a little elevated, incurved some distance in advance of the centre, and curve 

 over towards the front. The ventral margin is well curved, and on each side where it 

 meets the dorsal slopes forms a rounded angle. The hinge is composed of a strong 

 central almost horizontally placed cardinal tooth in the right valve, fitting in between 

 two in the left, of which the anterior is small, conical, and the posterior long and 

 subparallel with the dorsal line. A lateral tooth is present on each side in both vah'es, 

 the anterior in the right and the posterior in the left being the most distinct, and 

 separated from the outer edge by a deep groove. The ligament is small and placed on 

 the hiuge-line above the posterior cardinal of the left valve. The interior is grooved, the 

 grooves corresponding with the external ribs, and the outer margin is strongly and 

 squarely dentate. 



Length 5 mm., height 4;^, diameter 3f. 



Habitat. — Station 188, south of New Guinea, in 28 fathoms ; also Torres Strait, in 

 3 to 11 fathoms. 



In this species and CarditeUa aiKjasi imil CarditeUa capensis the hinge-plate between 

 the cardinal and lateral teeth is peculiarly striated with wrinkles. 



CarditeUa ancjasi, n. sj). (PI. XV. figs. 9-9a). 



Testa subquadrata, valde inasquilateralis, antice angusta, postice lata, rotuude trun- 

 cata, alba, supra costas rufo irregulariter maculata, costis radiantibus tenuibus nodulosis 



(ZOOL. CHALL. EXP.— PART XXXV. — 1885.) ■ Mm 28 



