359 



the central cartilage pit. The left valve has a posterior di- 

 verging cardinal tooth, and a long posterolateral tooth sep- 

 arated from the margin by a groove, which receives the pos- 

 tero-lateral marginal lamina of the right valve. The socket 

 of this cardinal is completed by a diverging tooth in the 

 right valve, lying anterior to it, where it rests on a low ledge, 

 and so forms also the posterior wall of the cartilage pit ; this 

 is completed dorsally by a horizontal projection forwards 

 from the right posterior cardinal jiist beneath the edge of 

 the prodissoconch, where there is a horizontal groove in each 

 valve. 



Condylocardia compressa, Hedley and May, sp. 



Cuna compressa, Hedlev and Mav. Records of the Aus- 

 tralian Museum, vol. vii., No. 2, 1908, p. 124, pi. xxiv., f. 29, 

 30, 31. 32. Type JocnUfy.— 100 fathoms, off Cape Pillar, Tas- 

 mania. 



Dredged off Beachport in 40 fathoms, three alive and ninety 

 valves; in 49 fathoms, one whole and fifty valves; in 110 

 fathoms, one whole, twenty-seven valves, several of them 

 poor; in 150 fathoms, twenty-five valves, rather poor; in 200 

 fathoms, two valves, poor; north-west of Cape Borda in 62 

 fathoms, twenty-three valves; and off Cape Jaffa in 130 

 fathoms, one valve. In 40 fathoms would appear to be its 

 real habitat. 



It comes very close to C. subradiafa, Tate, but its greater 

 number of less valid ribs and its more transverse shape when 

 young distinguish it. 



I suggested to Mr. Hedley that this species is a Coiidy- 

 Tocardia and not a Cuna; and he has re-examined the den- 

 tition and concurs in its generic transference. It is compara- 

 tively a gigantic species for the g^enus, which contains (with 

 the exception of C . suhradiata, Tate) only minute shells. 



Condylocardia ovata, Hedley. 

 Condylocardia ovata, Hedley, Proc. Linn. Soc, New South 

 Wales, 1905, part 4, vol. xxx., p. 539, pi. xxxi., f . 5, 6 ; Verco, 

 Trans. Roy. Soc, S. Austr., 1907, vol. xxxi., p. 109. 



Condylocardia trifoliata, Hedley. 



Condylocardia trifoliata, Hedley, Proc. Linn. Soc, 1906, 

 vol. xxxi.. p. 475; Yerco, Trans. Roy. Soc, S. Austr., 1907, vol. 

 xxxi., p. 109. 



Condylocardia pectinata, Tate and May. 



Carditella pectinata, Tate and Mav, Trans. Roy. Soc, S. 

 Austr., 1900, vol. xxiv., p. 103. Type Jocality.—' 'Berwent 

 Estuary, Tasmania" (W. L. May); Proc Linn. Soc, New South 

 Wales, 1901. vol. xxvi., part 3, p. 435, pi. xxvii., f. 96, 97. 



Condylocardia pectinata, Tate and May, sp., Hedlev, Mem. 

 Austr. Mus., 1902. vol. iv., part 5, p. 318, ''63-75 fathoms, off 



