458 Mr. W. H. Benson’s Conchological Notices. 
Art. LXIII. Conchological Notices ; 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, umbilicata, peritremate acuto non reflexo. 
Animal cits repens. Corpus reticulosum, elongatum. Pallium 
amplum, foramine communi magno perforatum, peritrema amplexans ; 
processibus duobus transversé rugosis (quasi articulatis) omni latere 
mobilibus instructum; unico prope teste aperture angulum superiorem 
exoriente, altero apud peripheriam teste. Osanticum inter tentacula 
inferiora hians; labia ‘radiato-plicata. Tentacula superiora elongata, 
punctum percipiens tumore oblongo situm gerentia. Penis pregrandis, 
antrum cervicis elongatum latere dextro et prope tentacula situm. Solea 
complanata, pedis lateribus equans. 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 Férussac. 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 haye 
adopted above. 
