56 



white, ventricose, with thick, rounded, concentric ridges, and brownish 

 black epidermis, a depressed area under the beak, marked by a notch in the 

 ventral valve. Rather uncommon. Long. 17, lat. 29, alt. 12. 



LiMOPSis TENisoNi, MiM. This shell was named by me L. cancellata in 

 Roy. Soc. Proc. Tas., 1876, but I find the name has been given by Reeve. 

 I therefore dedicate the shell to Colonel Tenison, of Kilronan Castle, Lord 

 Lieutenant of the County of Roscommon, Ireland. 



Pecten fumatus. Linn^, Syst. Nat., 12 edit, _p. 1144. This I regard as 

 identical with P. laticostatus, Gray, which occurs also in New Zealand. 

 They would have been recognised as identical long ago, but for the foregone 

 conclusion that the common shells were necessarily different because of the 

 dififerent habitat. Facts, proving exceptions to the rule, have been evaded by 

 the creation of new species, by which science has been burdened and re- 

 tarded. 



Pecten asperrimus. Lamarck, Vol. 7, V; ^^^- "^^ry common in all 

 S.A. and Tasmania. Wonderfully variable in color ; specimens of every 

 hue, — violet, orange, yellow, scarlet, and purple, may be found ; gracefully 

 ribbed, each main rib having smaller ones beside it, and all studded with 

 small spines, always regular in form, and never disturbed with lines of 

 growth. It has received many names from its varieties, such as P. australiSf 

 P. Tuhrum, etc. FossU specimens are very common in the pliocene rocks of 

 Government House quarry, Adelaide. 



Pecten bifrons, Lamarck, Vol. 7, 2^. 131. Common and in S.A. A 

 depressed oblique shell, about the dimensions of P. laticostatus,h\xt variable 

 in form. It has a few radiating main plaits upon the valves, which are 

 thickly lined with fine radiating riblets. The siu-f ace is finely shagreened in 

 a reticulate manner, and the insides of the valves are deeply saturated with 

 violet purple ; the ribs vary very much, sometimes they are few, and like 

 flattened keels ; for this reason I cannot distinguish Messrs. Adams and 

 Angas's P. tasmanmis (Zool. Proc, 1863, p. 428), whose specific character 

 as distinguished from P. bifrons is merely in the form of the ribs. 



Pecten mari^. Tenison- Woods. 



Radulalima. Linn4. Syst. Nat, 12 edit., p. 1147. Waxy white, with 

 many lamellose or spinous ribs. Ll ot common and very small, though in 

 S.E.A, it is often found 120 mil. long. 



Radula bullata. Born. Sow. Gen., Jig. 3. Narrow, inflated, white, 

 faintly rayed, -ears small. Long. 25, lat. 15, alt. 12, N. Coast only, Not 

 very common. 



Placunanomia ? A broken valve adhering to Mytilus latus, 



but too imperfect for determination, was shown to me. It had some of the 

 characters of P. zelandica (Gray in Dieffenbach's, N.Z. Vol. 2, x>- 260.) 



OsTREA EDULis. Linn6. loc. cit., p. 1148. The common species, world- 

 wide in its distribution, with the upper valve flat, and the lamellae of the 

 lower forming imbricated folds. . There are specimens in the Museum of the 

 Royal Society of Tasmania, from N.W. Bay, measuring 185 long, by 123 

 mil. wide; The variety of P. purpurescens, of S.A., is not known here, 

 neither is 0. virescens, Angas. 



OsTREA MORDAX. GoiUd, Proc. Bost. Soc, Vol. 3, ?). 345. The "rock 

 oyster" of N.S. Wales. Not common, being found in one or two places 

 only on the E. Coast. 



OsTREA RUTUPINA. Jeff, vav 0. edulis. The small, regularly formed 

 variety, not flaky, to which th^ " native oyster " belongs. Not common. 



OsTREA ANGASi. Soiverby in Reeve's Icon. pil. 13, fig. 28, species 27. An 

 inequivalve, laminately frilled species. Rare. The Tasmanian species are 

 smaller than Reeve's figure, 



