f OLLINGK : MOLLUSCA OF BORNEO. 81 



the shorter dart gland and dart-sac. The penis protrudes from its sheath, 

 at the distal end, and on the opposite side there is a small conical papilla 

 distal to which the retractor muscle is inserted. Only a portion of the 

 dart was present in the dart-sac, and this agrees in form with the proximal 

 portion of that of C. struhelli, Simr. 



Parmarion, P. Fisch. 



Parmarion shelfopdi, n.gp, 



PI. vii, figs. 7, 8 ; PI. viii, figs. 15, 16. 



Animal : the whole of the head, mantle and dorsum is blue, with the 

 medio-lateral portions yellow, the lateral margins of the mantle are also 

 yellow, and there is a prominent lateral keel on the mantle, encircling 

 a little more than two-thirds of the visceral mass. The peripodial groove 

 is distinct and rugae only faintly marked. Foot-fringe blue with deeply 

 indented blotches of yellow. Foot-sole yellowish-brown, divided into 

 median and lateral planes. 



Length (in alcohol) 32 millim. 



Shell thin, membranaceous oval, with thinner, irregular l)order, apex 

 indistinct. 



Diam. max. 13, min. 8 millim. 



Hah. — Kuching. 



In my former paper I stated that possibly the genus Parmarion, 

 sens, str., did not occur in Borneo, but there can be no question, I think, 

 as to the generic position of the mollusc here described. 



The Genera'ive Organs (PI. viii, figs. 15, 16). — These are characterised 

 by the long free-oviduct, the form of the penis, the short vas deferens, 

 and the form and shape of the dart. The penis has the beak-like distal 

 portion, so characteristic of most species of the genus, and immediately 

 below this is a collar-like sheath, while beyond, the organ becomes more 

 globose. The vas deferens is very short, also the duct of the recep- 

 taculum seminis. The dart at its free end is somewhat flattened, with a 

 sharp cutting edge at each side. Above the aperture leading into the 

 cavity of the dart is a solid calcareous head. Passing downward the 

 flattened form gradually disappears until it becomes oval (PI. viii. 

 fig. 16). 



Philomyeus, Raf. 

 Philomyeus, sp. 



From Matang there is a small slug belonging to this genus, which 

 probably may prove to be only a variety of P. hiUneatm, Bens. It is 

 a l)right yellow in colour, with irregular dark brown (almost black) spots 

 and blotches. In alcohol the specimen measures 20 milHm. in length. 



I am not aware that the genus has hitherto been recorded from 

 Borneo, 



