JOURNAL OF CONCHOLOGY. 24 1 



ON A NEW SPECIES OF SINISTRAL LIMN^A, 

 FROM CENTRAL AUSTRALIA, WITH SOME 

 REMARKS ON SO-CALLED SPECIES OF PHYSA, 

 ALSO FROM AUSTRALIA. 



By the rev. a. H. COOKE, M.A., F.Z.S. 



Curator in Zoology, Cambridge. 

 (Read before the Conchological Society.) 



Some years ago, ten or a dozen specimens of a fresh-water 

 shell were sent from Australia to my friend, Mr. H. M. 

 Gwatkin, of St. John's College, Cambridge, the exact locality 

 being given as " Paroo Creek, River Darling, 90 miles north of 

 Mount Murchison." The shell was sinistral, the dentition Mr. 

 Gwatkin at once determined to be that of a typical Lwincea, 

 such as our own stagnalis ox peregra. 



Failing to find the species described in the Monographs, 

 it occurred to me the other day to take specimens to the British 

 Museum, to see if the shell were known there. I found that 

 the species is probably new, but closely allied to two other 

 sinistral species in the British Museum, both from Australia. 



These however, curiously enough, were described, and have 

 always been regarded as Physa, not as LimtK^a. They are : — 

 I. Physa Hainesii Tryon, Amer. Journ. of Conch., vol. 

 ii., p. 9, pi. ii„ fig. 9. 

 „ „ Smith, Journ. Linn. Soc. Zool., vol. 



xvi.. On the Freshwater Shells of 

 Australia, p. 281. 

 „ ,, Klister, Mart, and Chem. Conch. Cab., 



Physa, nr. 252, p. 366, taf. 49, fig. i. 

 „ latilabiataSowb., Conch. Icon., vol. xix., Physa, 



fig- 33> <^- b. 

 „ Schayeri Troschel, Mus. Berolin. 



