82 COLLINGE : MOLLUSCA OF BORNEO. 



AtOpoS, Simr. 



Atopos shelfordi, n.sp. 

 PI. vii, figs. 9-12. 

 Colour of the notum hluisli-brown, with a dark, smooth stripe extending 

 along the mid-dorsal line ; the whole of the dorsum is finely granulated 

 and spotted with yellow ; underside (perinotum ?) brown ; foot-sole 

 same colour. The keel of the notum is prominent. Length of notum 

 (in alcohol) 64, breadth 11, height 12 millim. Breadth of foot-sole 6 

 millim. Female generative orifice 12.5 millim. from the male generative 

 orifice. 



Hah. — Mt. Penrissen, 4,800 ft., N.W. Borneo. One specimen. 



The genus Atopos has not previously been recorded from Borneo. 



As only a single specimen has been found I am unable to give more 

 than a very brief description of the internal structure. Mr. Shelford 

 has very kindly given me permission to open the animal, but naturally 

 I have not cared to injure it more than was absolutely necessary to esta- 

 blish its specific distinctness. It differs from any known species in a 

 number of points in the form of the alimentary canal and generativ ' 

 organs, the latter being very distinct. I have not given figures of either 

 system, as the specimen examined is evidently not fully mature. 

 Reference Lktters. 



