ANATOMY OF A COLLECTION OF SLUGS FROM N.W. BORNEO. 307 



5 and 10 per cent, solutions of hydrochloric acid, but no effect was obtained. Strong 

 hydrochloric acid caused the matrix to coagulate. 



2. Isselentia glohosa, n. sp. 

 PL III. fig. 50. 



Animal smaller but not at all unlike I. plicata ; the ground colour, however, is 

 lighter, and the posterior portions of the dorsum considerably lighter. The plications 

 of the mantle lobes are only slightly developed. 



Hob. — Poeh Mountain (3500 feet), Sarawak (A. H. Everett). 



Type in collection of British Museum. Two specimens. 



When recently examining these two specimens, I felt inclined to refer them to 

 /. plicata, but an examination of the generative organs shows that they exhibit some 

 important differences. 



Generative Organs. — (PL III. fig. 50.) 



The vestibule is small. The penis consists of a sac-like portion, above which it 

 becomes suddenly constricted and then dilates into a bulbous head. From the distal 

 portion of the penis, above the vas deferens, is a short diverticulum, partially covered 

 by the strong retractor muscle (PL III. fig. 50). From the side of the bulbous head of the 

 penis the vas deferens passes off as a thick tube, narrowing gradually as it approaches the 

 prostatic portion of the common duct. The receptaculum seminis is somewhat ovoid 

 and sessile, and opens into the vagina ; to the right of this is the opening of the free- 

 oviduct. The first portion of this organ is thrown into a series of constrictions. The 

 oviduct is a wide tube and densely folded, the prostatic and oviducal portions 

 terminating in a bulbous head lying immediately in front of the globular albumen gland. 

 The hermaphrodite gland is almost circular and flattened, showing a slight fold or 

 indentation in the centre. The dart-gland is a large, thick, muscular-walled tube, making 

 a sharp S-shaped bend distally. Just below this is the dart-sac, which contains a 

 calcareous dart similar in shape to that in /. plicata (PL III. fig. 39), but whether or 

 not it is perforated I cannot say, as the head had been broken away. 



VII. The Genus Veronicella, Blainv. 

 1. Veronicella shelf ordiana, n. sp. 

 PL I. figs. 16, 17. 



Animal dark-brown dorsally, with dense yellow spotting and median dorsal 

 yellowish-brown stripe. Hyponotum and foot-sole light-brown. 



Length (in alcohol) 20 millim. ; foot-sole 2*5 millim. broad; hyponotum 4 millim. 

 broad. Female generative orifice on the right side, 3 millim. from the foot-sole, 11-5 



