74 collinge: non-operculate land and freshwater molluscs. 



Shell ainber coloured, thin, membranaceous, apex distinct, whorls 2. 



Maj. diam. 9'5, min. 5 millim. 



Body cavity not extending posterior to the visceral mass. Intest- 

 inal tract short. Generative organs Parmario?i-\ike. Well developed 

 penis with beak-like head, no penis papilla. Dart-gland and dart-sac, 

 latter containing fleshy dart. 



Hah. — Gunong Inas, 3,500 ft.. State of Perak. 



I have pleasure in associating with this interesting species the 

 name of Mr. F. J. Partridge, who" has spared no pains to faithfully 

 represent by his skillful brush and pencil, most of the specimens in 

 this collection. 



Tlie Alhnenfary Canal {VX. iv, fig. 7). — The intestinal tract is both 

 short and simple. Commencing at the fairly large buccal cavity, the 

 oesophagus passes off from the dorsal side, and after a short course 

 enters the wide pyriform crop, which has, at its posterior end, a sharp 

 constriction marking the division between the crop and the ill-defined 

 stomach. The intestine passes off from the posterior end of the 

 stomach, and making a bend forward and to the right side forms the 

 second loop of the intestinal tract, then gradually narrowing, a very 

 short backwardly directed loop follows, which again bends forward 

 to form the rectal portion, and terminates at the anus. 



Lying at each side of the forepart of the crop is a conspicuous 

 salivary gland, which gives off a duct opening at the side of the oeso- 

 phagus, on the dorsal region of the buccal cavity. 



The Generative On/ans (PI. iv, figs. 8-1 1). — ^The form and general 

 character of these organs at once indicate the Parmarion relationship 

 of this genus. The vagina, which opens into the vestibule by an 

 opening common to this organ and the dart-sac, is short and wide ; at 

 its posterior end it becomes constricted, and on the right side the 

 duct of the pyriform receptaculum seminis opens into it. Beyond the 

 constriction is the free-oviduct, which at first is a wide, sac-like cavity, 

 suddenly narrowing into a tube, w hich as it passes backward gradually 

 widens until it joins the oviducal portion of the common duct. 

 Externally the lower portion has its wall thrown into a series of folds 

 which give it a fluted appearance. The penis is a long tube-like 

 organ, with a sharply differentiated beak-like head At the distal end 

 of the tube-like portion, the retractor muscle is inserted. The two 

 portions of the penis are connected together by a short neck. The 

 head is marked by a series of crescent shaped constrictions, while 

 just below the point where the vas deferens joins the penis, there is a 

 peculiar little outgrowth (PI. iv, fig. 9, x). Internally the cavity of the 

 penis differs considerably from the external form. Commencing as a 



