347 



and very high. The ribs may be acute and scaly, or may 

 become nearly obsolete, especially behind the umbo-ventral 

 ridge. 



It may attain a transverse length of 65 mm., 10 mm. 

 more than that of Lamarck's type. This may vary consider- 

 ably in proportion to the umbo-ventral height, as may also 

 the prominence of the curved costal scales. 



Mytilicardia calyculata, Linnaeus. 



Chama calyculata, Linnaeus; Svst, Nat., 1767, p. 1138. 



Cardita calyculata, Lamarck; Anim. S. Vert., 1819, vol, vi., 

 part 1, p. 24. 



Cardita aviculina, Lamarck; op. cit., p. 26, No. 20. 



Cardita excavata, Deshayes ; Proc. Zool. Soc, Lond., 1852, 

 p. 100, pi. xvii., f. 1-3. 



Mytilicardia tasmanica, Tenison-AVoods ; Proc. Roy. Soc, 

 Tasm., 1876, p. 161. 



Taken on the beach at Venus Bay, West Coast of South 

 Australia; very rarely dredged. 



Mytilicardia concamerata, Chemnitz. 



Cardita concamerata, Reeve, Men., t. 9, f. 42. 



Thecalia macrotheca, A. Adams and Angas, Proc. Zool. Soc, 

 Lond., 1864, p. 39. 



Mytilicardia concamerata, Chemnitz, Tate, Trans. Rov. Soc, 

 S. Austr., vol. ix., 1886, p. 100. 



The habitat is given as "under stones at low tide," 

 'Rapid Bay, South Australia" (Coll. Angas). But there were 

 no specimens in Tate's collection. I have not taken it any- 

 where, nor has any collector other than Angas recognized it. 

 It does not appear to have been recorded from Victoria, Tas- 

 mania, or Western Australia. Possibly some shells from else- 

 where were by mistake placed among those in Angas's collec- 

 tion from South Australia. 



Venericardia dilecta, E. A. Smith. 



PI. xiv., f. 8. 



Cardita dilecta, E. A. Smith; Challenger Rep., Zool., 1885, 

 vol. xiii., p. 213, pl. xv., f. 4, 4a. Dim. — Length 8 mm., height 

 6 mm., diameter oo. Hah. — "Off East Moncoeur Island. Bass 

 Strait,' in 38 to 40 fathoms. 



This has been dredged in Backstairs Passage in 17 

 fathoms, two alive and many valves; in 22 fathoms, two alive 

 and forty-eight valves; and in Gulf St. Vincent, depth un- 

 noted, many alive and dead; in 25 fathoms off Beachport, two 

 poor valves; in 45 fathoms east of the Neptune Islands, one 

 alive and eighteen valves; in 55 fathoms off Cape Borda, two 

 poor valves; in 100 fathoms off Beachport, eight valves in 

 poor and nine in moderate condition; in 130 fathoms off Cape 



