99 



Holdfast Bay and Salt Creek, St. Vincent Gulf ; Streaky 

 Bay ; also in the Pleistocene shell-limestone of the Port Ade- 

 laide Creek, not uncommon. 



Quadrately orbicular, flat, umbo produced, acute, a little in 

 front of the centre ; microscopically sculptured with concentric 

 and radial striae ; attains to three-eighths of an inch long. 



107. Lepton trigonale, Tate, Trans. Eoy. Soc. S. Aust., 

 1879, t, 5, fig. 5. 



Fowler and Streaky Bays, Port Lincoln, St. Vincent Gulf. 

 Trangularly ovate, with finely shagreen-sculpture on the 

 sides, umbones produced, small, acute. 



108. Leptox ovatuai, Tate, antea, p. 68, t. 5, f. 11. 

 In shell sand, Holdfast Bay. 



Minute, ovate-oblong, umbones obtuse, oramented with dis- 

 tant growth lines and very minute granules. 



109. LASiEA rubra, Montague. 



Between tide marks in rock crevices and among mussels, &c; 

 throughout our coast line. 



This cosmopolitan species has a host of synonyms, and the 

 following specific names have been established on Southern 

 examples : — Poronia australis, Sow., T. Woods, Angas ; Poronia 

 purpurata, scalaris, JParreysi, Philippi. 



A minute cordately-ovate shell, varying from broadly con- 

 centrically ribbed to almost smooth ; reddish to white, red 

 stained along the hinge line. 



110. Mtsella donaciformis, Angas, Proc. Zool. Soc, 1878, 

 p. 863. t. 54, f. 13. 



Fowler, Streaky, and Laura Bays, Great Australian Bight ; 

 St. Vincent Gulf ; also King George Sound ! 



A cuneiform, somewhat solid shell, about one-fourth of an 

 inch long. 



The genus My sella (M. anomala, Angas, op. cit., 1877) was 

 placed by its author in the family Tellinidae, but the absence 

 of a pallial sinus, the internal cartilage, and the dentition 

 bring it in close relation to Montacuta. 



111. Scintilla lunata, Tate, antea, p. 69, t. 4, f. 8. 

 Creeping on rocks at extreme low tide, Edithburg, Yorke 



Peninsula {McDougalT). 



Ovate-lanceolate, pellucid, compressed. 



Family Solemtidj:. 



112. Solemya australis, Lamarck, An. s. Vert., v., p. 489. 

 St. Vincent Gulf; occasionally cast up in considerable num- 

 bers at Holdfast Bay; also King George Sound (type). 



