49 



mollusc. I have foimd them ou many different shells. Rare, but some« 

 what common in S.E.A. 



Mtochama sp ? Parasitic on Pectens at Long Bay. W. F. Petterd. 



Chamostrea albida. Lamarck, Vol. 6, p. 585 ( Cleidotlicerus chamoides 

 Sow., Genera of SJiells, Jigs. 1, 2, 3.) Somewhat common in shallow places, 

 such as Sorell, Pittwater, etc. This curious shell, which is always attached, 

 was made the type of a very interesting genus by Sowerby, because of the 

 loose ossicle in the hinge, . The size varies from 20 to 50, or even 60 mil., 

 but the latter size only in N.S. Wales. 



Mactra rufescens. Lamarck, Vol. 6, p. 102. A soHd, flexuously 

 wrinkled shell, of pale brown color, but stained with purple inside and out. 

 Long. 62, lat. 55, alt. 28. Common. 



Mactra pur a. Desliayes, Zool. Proc, 1853, p. 15. Solid, white, with 

 thin, silky periostraca, triangular, eqvdlateral, obtusely angled, posteriorly 

 and obsoletely striate. Extends through Bass' Straits to W.A. Not 

 common, E. and S. Coasts. Long. 46, lat. 50, alt. 27. 



Mactra cretacea. Angas., Proc. Zool. Soc, 1867,^;. 909 (as Spisula). 

 Small, transversely trigonal, chalky-looking white species, without any 

 periostraca, and a distinct posterior angle. Long. 16, lat. 12 J, alt. 8. 

 Tamar Heads. 



Anapa triquetrum. Hanley, Zool. Proc, 1843, p. 101. A very thick, 

 triangular tumid shell, whitish and concentrically striate. Long. 30, lat. 31, 

 alt. 25. Kare in Tasmania, habitat very doubtful, though Mr. Hanley 

 quotes it as from Tasmania. Very common in S. A., Guichen Bay especially. 

 Mr. H. says, " I know of no species which could possibly be confounded 

 with this extraordinary shell, which from the peciiliar triangular cavity 

 between the beak may prove the type of a sub-genus," 



Anapa tasmanica. Mihi. Possibly only a small variety of preceding. 



Tellina deltoidalis. LamarcTc, Vol. 6, p. 206. Rather smooth, deltoid, 

 compressed, arcuate, beaked anteriorly. Long. 38, lat. 46, alt. 11 ; much 

 smaller in S.E.A. " This species varies greatly in size and aspect, and has 

 a wide range over the south portions of Australia, Tasmania, and New Zea- 

 land." — Angas, Zool. Proc, 1865. 



Tellina albinella. Lamarck, Vol. 6, y. 194. The rose-colored and 

 white zoned variety of this shell is the common species in Tasmania. Long. 

 30, lat. 54, alt. 5. On all exposed surf -beaten beaches. Very common at the 

 mouth of the Murray, in S. Australia. 



Tellina diemanensis. Desliayes, Zool. Proc, 1854, p. 361. A much 

 lighter, thinner, and more curved shell than T. deltoidalis, and of pale fawn 

 color. Very rare, I have not been able to meet with the species, 



Tellina tristis. Desliayes, lac. cit. Trigonal with eroded periostraca. 

 Not known to me. 



Tellina (Arcopagia) decussata. Lamarck, Vol.6, p. 205. An orbicu- 

 larly trigonal shell, subequilateral, conspicuously decussate. B. Sts. only. 

 Long. 38, lat. 43, alt. 20. Common in S.A. 



Tellina marine. Tenison- Woods. 



Gari cosipta. Desliayes, Zool. Proc, 1854, ^j. 321. A species reticulated 

 with cross striae, and with red- violet rays, which I have not seen. 



Gari striata. Desliayes, Zool. Proc, 1854, p. 321. Shining, com- 

 pressed, finely striate, zoned with livid brown and purple. Long. 15, lat. 

 20, alt. 5. Common. 



Gari zonalis. Lamarck, Vol. '6, p. 182. Smooth, compressed, very 

 finely striate, with livid zones. Reeve, on the authority of R. C. Gimn, 

 gives N. Tasmania as the habitat, but his figures and descriptions do not 

 agree >yith those of Lamarck. 



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