OF CONCHOLOGY. f9 



DESCRIPTIONS OP NEW SPECIES OP AUSTRALIAN 

 FRESH-WATER SHELLS. 



BY T. A. CONRAD. 



I published, in the " Proceedings of the Academy of Nat- 

 ural Sciences of Philadelphia," Vol. V., p. 10—11, Feb., 1850, 

 descriptions of several new species of fresh-water shells from 

 Australia. The Unios contained in that paper, were afterwards 

 more fully described by me in the "Journal of the Academy," 

 with lithographic figures; but the univalve shells have,untilnow, 

 remained unfigured. Finding that a number of new species 

 from the same country have 'been recently described in the 

 "Zoological Proceedings," London, I now re-publish mine, 

 with colored illustrations, in order to enable naturalists to 

 make more satisfactory comparisons. 



1 . Vivipara sublineata, Conrad. — 1. 1, f. 8. 



Description. — "Ventricose, conoidal, sub-umbilicate ; volu- 

 tions 5, ventricose ; epidermis olive, polished, with minute obso- 

 lete revolving lines ; body whorl sub-carinated in the middle ; 

 aperture sub-oval. |, f ." 



Paludina sublineata, Conrad. — Proc. Acad. Nat. Sci., 1850, 



p. 11. 

 Locality. — Darling Eiver, Australia. 



Observations. — This species belongs to a very distinct group 

 of Viviparidae of exotic distribution, and which is represented 

 by V. melanostoma, Benson ; V. Ceylonica, Dohrn ; V. prse- 

 morsa, Benson; V. amplior, Mousson; V. dissimilis, Muller, 

 etc. 



It is very distinct from all of the above, and does not re- 

 semble the descriptions of any of the Australian Viviparida^. 

 The revolving lines are closely arranged, but so minute as to 

 be invisible without a lens. 



