318 



"THETIS'' SCIENTIFIC RESULTS. 



material taken previously by a Museum dredging excursion at 

 Watson's Bay. 



CONDYLOCARDIA PECTIN ATA, Tate dt Mmj, sp. 



Carditella peotinata, Tate & May, Trans. Roy. Soc. S.A., xxiv., 

 1900, p. 103; Id, Linn. Soc. N.S.W., xxvi., 1901, p. 435, 

 pi. xxvii, ff. 96-97. 



Station 49. 



A few immature valves from 63-75 fathoms off Port Kembla. 

 The species also occurs in Sydney Harbour. 



Family CARDITIT:)^. 



C A R D I T A, Bruguiere. 



CARDITA CAVATICA, sp. nov. 



(Fig. 58.) 



Station 49. 



Shell inflated, ovate-oblong in the largest specimen, inclining to 

 a square outline when young, very inequilateral, posterior side 



thrice as long as the anterior. 

 Colour dull cream, sparsely irregu- 

 larly spotted with chocolate. 

 Sculpture : numerous close, nar- 

 row, erect, radiating ribs, 26 in 

 number on the type specimen. 

 These radii are surmounted by 

 scales, about 70 to a rib, which 

 ventrally are low, Inroad and 

 crowded, while dorsally they 

 gradually become narrow, erect 

 and distant hollow spines. The 

 deep interstices are about the 

 breadth of the radii, and sculp- 

 tured by concentric threads in 

 Ijroken lengths. Lunule short, 

 cordate and deeply impressed. 

 Inner ventral margin double, 

 developing an interlocking tubercle beneath each furrow of the 

 external sculpture. Length, 17 ; height, 14 ; dej)th of single 

 valve, 6 mm. 



Probaljly this is the Cardita, sp., noted in the Challenger 

 Report as from Port Jackson.* By its remarkable sculpture it 



Caedita cavitica. 

 Fig. 58. 



Smith— Cliall. Rop., Zool.. xiii., 1885, p. 213. 



