( 201 ) 



N" 302. Planorbis Rosstiieri Ckossk. 



Jouru. Conch., 3^ sôrie , t. XI, p. iJOi lS7t. 



Testa utrinque late sed parum profonde umbiticata, lenticularis , 

 valde planata, sublœcifjata, tennis, transludda, lutco-cornea; spira 

 7nedio concaviuscula ; sutura impressa; anfr. 3 1.3 planati, ultinms 

 magnus, ad periphsriam acute carinatus; apcrtura horizonlalis, acute 

 clliptico-oi-ata, intus albida; perlstoma simplex acutum, margine 

 cxterno versus insertionem protracto. 



Diam. maj. o 12 mill.; min. 4 12; ait. 1 13 mil!. 



IIab. In insula Marc dicta (Loyally); ( R. Rossilcr) IL Crosse). 



