MOLLUSCA — IIKDI-KV. 



■Ml 



Faniihj CONDYLOCARDIID^. 



C O N D Y L O C A 11 I) T A, Bernard. 



CONDYLOCARDIA PROJECTA, sp. n.n. 



(Fig. r)7.) 



Stations 13, 4!). 



Shell extremely small, cream coloured, mudeiately inflated, 

 ovate cuneate, very inequilateral, the anterior side four times as 

 long as the posterior. Dorsal mar- 

 gin straight, anterior end tapering ; 

 ventral margin rounded, posterior 

 end rapidly descending, hollow above, 

 projecting below. Prodissoconch 

 very large, consisting of a medially 

 cleft protuberance, arising from a 

 thick lipped basin, contained in a 

 second basin. Dorsal area lanceolate, 

 hollow, smooth, bounded by a ci'est 

 whereon terminates the concentric 

 sculptui'e. Sculpture : there are 

 about sixteen narrow, elevated, 

 curled, reversely imbricating ridges, 

 crowded above, wider spaced below, 

 without trace of radials. Hinge 

 margin long and straight, a line of 

 primiti^■e crenulations above, chon- 

 drophore medial well immersed ; in 

 the right valve a feeble anterior and 

 posterior cardinal ; in the left a single 

 massive posterior cardinal ; in each 

 valve an anterior lateral. Muscular 

 impressions invisible. Inner ventral margin with about twenty- 

 five interlocking rounded tubercles. Height, 1 mm. ; length, 

 1'2 mm. 



This species is smaller than any Australian bivalve yet described. 

 It represents a genus new to Australian seas. As framed by its 

 author,*" Condylocardia contains two species from Stewart Island, 

 New Zealand, two from St. Paul's in the Indian Ocean, and a 

 French Tertiary fossil. 



A few odd valves were taken by the "Thetis" off Port 

 Kembla in 63-75 fathoms, and off Cape Three Points in 41-50 

 fathoms. My figures and description are deri^ed from better 



CONDTLOCARDIA PROJECTA. 



Fig. 57. 



* Bernard— Journ. de Conch,, xliv., 1896 (1897), p. 169-206. 



