SOME LITTLE KNOWN GENERA OF AUSTRALIAN MOLLUSCA. 335 



6.— ON SOME NEW OR LITTLE KNOWN GENERA OF 

 AUSTRALIAN MOLLUSCA* 



By Ralph Tate, F.L.S., F.G.S., Professor of Natural Science 

 in the University of Adelaide. 



CCELODON. 



C. patulns, n.sp., di'edged in life in St. Vincent Gulf. This 

 genus, separated by Carpenter in 1864 from Pandora, has been 

 recorded in one Oriental species (C. elongattis, Carpenter) from 

 North Australia by Mr. E. A. Smith in the "Zoology of the 

 Challenger Expedition." 



RiETA. 



B. meridionaUs, n.sp., St. Vincent Gulf. A Mya-Wke Lutraria, 

 hitherto unrecorded from Australia, though represented in New 

 Zealand by R. perspicua, Hutton. 



EPHIPPODONTA. 



A new genus founded on Scintilla hinafa, Tate, and B. 

 McDouyalli, n.sp., inhabiting St. Vincent Gulf. It differs fi'om 

 Scintilla and Galeomma by possessing two erect cardinal teeth in 

 each valve, which are opposed to each other by their bifid ends 

 and not alternating. The animal has the creeping habit of 

 Galeomma ; the valves are flexible and spread out flat, indeed 

 while in life they cannot be brought into near proximity. Both 

 species live on the mud-formed burrows of the shrimp (Axus sp.), 

 sheltering beneath large stones and overhanging rock-ledges. 

 Mr. McDougall, the discoverer of both species, who has kept 

 them in confinement, informs me, when the animal is in motion 

 the anterior margins of the mantle are largely expanded in a 

 funnel form. 



SACCHIA. 



I venture to attach to this genus, the following species described 

 by Angas under Felania, a sub-genus of Mysia (or Diplodonta), as 

 F. Adajusi, and F. jacksoniensis, both from New South Wales, 

 though the former is now known to extend to St. Vincent Gulf. 

 The well-developed dental plate, deeply and largely excavated for 

 the cartilage, particularly distinguishes the genus from Diplodonta. 

 The genus has hitherto been known by a few species, living and 



*The new species are described and figiared in the Trans. Roy. Soc. S. Australia for 1888, 

 issued May, 1889, 



