44 



Diagnoses of Ne^at Species of Miocene 

 Fossils from South Australia. 



By Pkofessob E. Tate. 

 [Read June 13, 1882.] 



Pecten subbifrons, spec. nov. 



An equivalve, some what flattisli stell, having the general 

 form o£ the recent P. hifrons, and with the same shagreen-like 

 sculpture ; but from which it differs in its compressed and 

 truncated ribs. The ribs are about twelve in number, with one 

 or two longitudinal furrows and small tubercles ; one or two 

 slender ribs in the flat interstitial spaces. 



Locality and Horizon. — In the calciferous sandstones, Ade- 

 laide. 



Pecten asperrimus, Lamarck, var? 



A very common pecten in the Upper Aldinga series and its 

 equivalents, I refer with some doubt to the Lamarckian 

 species, P. asperrimus, of our waters, which has been subse- 

 quently named by Sowerby, and better known as P. australis. 



The chief differences are printed in italics in the following 

 brief characters : — 



Eibs, 24 to 26, flanked on each side by two or tliree secondary 

 ribs, with or without one rih in the furrow ; all the ribs with 

 imbricating sub-erect scales or lamellae. Ears rather larger than 

 in recent examples. Largest examples much exceeding recent 

 individuals. 



Locality and Horizon. — Upper Aldinga series at Adelaide, 

 Hallett's Cove, and Aldinga; Edithburgh, Yorke's Peninsula. 



Pecten spondyloides, 8'pec. nov. 



Shell equivalve, equilateral, inflated, about as long as broad, 

 covered with numerous compressed spiniferous ribs; the spines 

 are of the nature of compressed imbricating squam.T. There are 

 usually from seven to nine primary ribs, two or three secondaries 

 and a variable number of tertiaries between each pair of 

 primary ribs, all similarly ornan^ntcd, the dimensions of the 

 spines varying with the size of the ribs. 



Eront margin of valves curved or slightly crenulated, not at 

 all angular. 



Ears equal, of moderate size, truncated ; there is no byssal 



