358 



Vincent, very many; in 40, 45, 49, 55, 62, 110, and 130 

 fathoms, from Beachport to the Neptune Islands, but mostly 

 in poor condition. 



Diagnosis. — From C. concentricu, Hedley, by its curved 

 lateral and non-denticulated ventral borders; from C. 

 edentata, by its larger size and curved lateral borders; from 

 C. atkinsoni, by the character of the hinge and the non- 

 denticulated border. 



Type in Dr. Verco's collection. 



Condylocardia subradiata, Tate, sp. PI. xvii., f. 25 to 28. 



CarditcUa suhradiafa, Tate, Trans. Roy. Soc, S. Austr., vol. 

 xi., 1888, pi. xi., f. 7. Type locality — Shell sand, Royston Head. 



Dredged off Royston Head, 20 fathoms, one alive, large; 

 Backstairs Passage, 22 fathoms, one alive and six valves; off 

 Beachport in 40 fathoms, fourteen valves; in 49 fathoms, very 

 •many valves, good; in 110 fathoms, nine whole and very many 

 valves : in 90 fathoms off Cape Jaffa, many valves ; 

 east of North Neptune Island in 45 fathoms, one 

 whole, three valves, all poor; north-west of Cape Borda in 

 62 fathoms, five alive and many valves, good ; thirty-five miles 

 south-west of Neptune Islands in 104 fathoms, four valves, 

 poor. It seems to live in water from 20 to 100 fathoms. 



Its generic location has been changed. Tate did not 

 allude to its dentition in his description, and only the ex- 

 ternal surface was figured. His type, which is the only ex- 

 ample in his collection, was fixed on a card to show the outer 

 surface, and was regarded by him as a left Carditella valve, 

 produced posteriorly : but it proves to be a right Condylocardia 

 valve, produced anteriorly. It has a distinct prodissoconch 

 scale, separated by a narrow groove from the hinge-plate be- 

 low. A large subcentral cartilage pit is bounded in front by 

 a comparatively long diverging cardinal tooth, and behind 

 by a thinner, lower, and shorter diverging lamina. The 

 long antero-lateral tooth is separated from the margin by a 

 groove, and the postero-lateral tooth is marginal. 



Two other valves have furnished the illustrations of the 

 hinge of this species, which may be more fully described 

 thus : accepting Bernard's conclusion for his genus that the 

 anterior is the produced side. The right valve has a diverg- 

 ing front cardinal tooth, and a long antero-lateral separated 

 from the margin by a groove ; this receives the antero-lateral 

 marginal lamina of the left valve : this lamina is continued 

 as a sort of hook round the dorsum of the right cardinal, and 

 as a diverging left cardinal down its posterior side, where it 

 rests on a low narrow shelf at the base of, and forms the 

 socket of, the right cardinal and also the anterior wall of 



