458 Mr. W. H. Benson's Conchologlcal Notices. 



Art. LXIIf. Conchological JSTotices ; chiefly relating to the 

 Land and Fresh-water Shells of the Gangetic. Provinces 

 of Hindoostan. By W. H. Benson, Esq., of the 

 Bengal Civil Service. 



Genus Nanina, Gray.* 

 Testa heliciformis, umbillcata, peritreraale acuto non reflexo. 

 Animal cilo repens. Corpus reticulosum, elongatum. Pallium 

 amplura, foramine communi magno perforatum, peritrema amplexans ; 

 processibus duobus transverse rugosis (quasi articulatis) omni latere 

 mobilibus instructum ; unico prope testes aperturse angulum superiorem 

 exoriente, altero apud periphseriam testse. Os anticum inter tentacula 

 inferiora hians; labia radiato-plicata. Tentacula superiora elongata, 

 punctum percipiens tumore oblongo situm gerentia. Penis prsegrandis, 

 antrum cervicis elongatum latere dextro et prope tentacula situm. Solea 

 complanata, pedis lateribus sequans. Cauda tentaculata ; tentaculum 

 sub retractile, glandula ad basin posita humorem viscidum (animale 

 attrectato) exsudante. 



This animal appears to be intermediate between the genera Stenopus 

 of Guilding and Helicolimax of De Ferussac. To the former it is allied 

 by its tentaculated and pervious posterior extremity. In the form of its 

 shell it resembles Stenopus, while the mantle reverted over the lip of 

 the shell, and its lubricating processes, shew an approach on the other 

 side to Helicolimax. It differs from Stenopus in having its sole the whole 

 breadth of the foot, while it again resembles it, and thereby differs from 

 Helicolimax, in having very long superior tentacula. Like Stenopus the 

 animal in moist weather is rarely retracted within the shell, the foot 



* The peculiar form of the animal of this genus had long since induced me 

 to regard it as constituting a distinct group, to which I had, in my MSS,, 

 assigned the name of Tanychlamys. On submitting specimens, however, to the 

 Zoological Society at one of its late Meetings, I find that I have been anticipated 

 by Mr. Gray, who had just previously proposed for it the name which I have 

 adopted above. 



