84 



21. Mactra pol it a, Chemnitz ; M. australis, Lamarck, An. 

 s. Yert., v., p. 475. 



Common in sand at low water. St. Vincent and Spencer 

 Gulfs ; Eowler Bay and Head of Great Australian Bight. 

 Also King George Sound (Lamarck's type). 



Triangularly ovate, rounded anteriorly ; banded with light- 

 grey and violet beneath a pale-brown epidermis • length, one 

 and a half inches. 



22. Mactra jacksoxiensis, E. A. Smith, Toy. Challenger, 

 t. 5, fig. 9, p. 62, 1885. 



Hog Bay, Kangaroo Island ; Streaky Bay, Great Australian 

 Bight. Also Port Jackson ! 



Triangularly elongate, equilateral, shining usually white 

 rayed with brown ; five-eighths of an inch long. 



23. Mactra amygdala, Crosse & Fischer, in Journ. de 

 Conch., 1865, p. 426, 1. 11, f. 3. 



Head of Spencer Gulf {Angas). 



An oval white species, truncated posteriorly, about half an 

 inch long. 



24. Mactra (Hemimactra) versicolor, Tate, antea, p. 64, 

 t. 4, figs. Yla—Ylb. 



Lake MacDonnell towards the Great Australian Bight. 



Triangularly ovate, obliquely truncated behind, shining, white, 

 yellow, brown, purplish or bluish-white, concentrically lirate ; 

 leDgth, half an inch. 



25. Mactra (Hemimactra) oyallna., Lamarck in An. s. Vert., 

 v., p. 477 (1818). Sjpisula Adelaides, Angas in Proc. Zool. 

 Soc, 1865. 



Holdfast, Aldinga, and Encounter Bays ; Port Adelaide 

 Creek (type of S. Adelaides) . Also Victoria and New South 

 Wales. 



Ovate, white, rufous tinted about the umbos, posterior slope 

 slightly keeled, rather gapiug posteriorly ; about one inch long 

 by three-eighths high. 



26. Mactra (Mullnia) pi^ t guis, Crosse & Eischer, Journ. 

 de Conch., 1865, t. 11, £. 2, p. 427. 



Port Lincoln {Angas) . 



Oval trigonal, much inflated and thick, fulvous, colour 

 darker towards the extremities ; length about one inch. 



27. Lutraria rhtnch^ena, Reeve, Mon., t. 4, f. 16. 

 Dredged on oyster banks off Port Lincoln {Angas) . 

 Obliquely arched, with the anterior side beaked. 



