83 



Gulf ; Coffin Bay (S. Aust. Mug. /) ; and off the mouth of the 

 Patawalonga, Holdfast Bay (Bednall!). Common at Corio 

 Bay, Port Phillip, thence extending to Queensland. 



An oblong inequilateral shell, widely gaping and curved 

 upwards posteriorly ; length, two and a half inches. 



15. Anatina gracilis, Eeeve, Mon., t. 2, f. 9. 



Port Adelaide Creek, Holdfast Bay, and Wallaroo. Also 

 Moreton Bay, Queensland. 



A narrow oblong shell, almost equilateral, one and three- 

 quarter inches long. 



16. Mtodora brevis, Sowerby ; Eeeve, Mon., t. 1, f . 7. 

 Denial Bay, Great Australian Bight. Also Tasmania to 



Queensland and New Zealand. 



Eight valve with small much incurved beak, triangular, 

 ornamented with flexuous ribs. 



17. Mtodora oyata, Eeeve, Mon., t. 1, f. 4. 



Port Adelaide Creek(!) ; Encounter Bay (R. H. Rulleine I) . 

 Also Tasmania and New South Wales ; doubtfully Philippine 

 Islands {Reeve). 



Eight valve ovate, somewhat triangular, with about 20 thick 

 concentric ribs. 



18. Mtodora a^custata, Angas (Alicia), in Proc. Zool. Soc, 

 1867, t. 44, f. 1, p. 908. 



Dead shells dredged in 22 fathoms, Encounter Bay (R. H. 

 Rulleinel). Also in New South Wales. 



A narrowly oblong shell with the aspect of a Thracia, upon 

 which Angas founded the genus of Alicia, but which E. A. 

 Smith, in Toy. of Challenger, removed to Myodora • length, 

 half an inch. 



EAMILT MACTRIDiE. 



19. Mactra rufescens, Lamarck, An. s. Vert., v., p. 476. 

 Great Australian Bight ; Encounter Bay and southward. 



Extends from Shark Bay (Lamarck) to Tasmania. 



Broadly triangular, solid, pale-brown, somewhat pointed at 

 the extremities, towards which the surface is nexuously wrinkled; 

 length, two inches. 



20. Mactra pura, Deshayes, in Proc. Zool. Soc, 1853, p. 15. 

 St. Vincent and Spencer Gulfs ; Fowler Bay, Head of the Great 

 Bight, and Eucla. Also King George Sound and Tasmania. 



Solid, ivory-white beneath a light-brown silky epidermis ; 

 larger, more solid, and less equilateral than the last; length, 

 one and three-quarter inches. 



