Land- Mollusks from Java. 401 



In the depressions between one raised portion and another 

 the epidermal cells have the usual characters, and it is in 

 these depressed areas that the various unicellular glands open 

 to the surface. The pigment is contained in a series of 

 branched connective-tissue cells, which are most numerous 

 around the region of the glands. In all other features the 

 structure agreed very closely with that described by Plate (1) 

 in Daudehardia. 



The Generative Organs. — There is a large somewhat 

 triangular-shaped vestibule. Looked at dorsally the vagina 

 is seen to open into this on the ventral portion of the right 

 side. The receptacular duct is very short, in fact only when 

 looked at from the ventral side does there seem to be one 

 (PI. VIII. fig. 17). Dorsally the pyriform receptaculum 

 seminis seems to open directly into the vagina. The penis 

 opens into the middle portion of the vestibule on its ventral 

 side (PI. VIII. fig. 16). Distally it has a hammer-shaped 

 enlargement, terminating on one side as a beak-shaped 

 process, and on the other gradually becomes smaller and 

 gives place to the vas deferens. When dissected open the 

 })enis is seen to have a very different appearance (PI. VIII. 

 fig. 18), agreeing in this respect with M. Austeni, Simr. At 

 the point of junction of vas deferens and penis- tube there is 

 scarcely any perceptible difference ; further on the tube widens 

 and forms a cavity in the distal head of the penis; then 

 follows another tube-like portion, this latter dilating and 

 again becoming tube-like, and passing towards the vestibule, 

 it again dilates at its external proximal end. The retractor 

 muscle of the penis is inserted just below the liaramer-shaped 

 head. The vas deferens passes beneath the proximal portion 

 of the penis and joins the prostatic portion of the common 

 duct on the ventral side (PI. VIII. figs. 16 and 17). The 

 intervening portion below this and above the receptaculum 

 seminis is the free oviduct ; it is slightly convoluted, gradually 

 enlarging distally, and ultimately widens out into a spirally 

 coiled oviducal portion, whose folds almost Iiide the prostatic 

 canal ; dorsally they entirely do so (c/. PI. VIII. figs. 16 and 

 17). The albumen-gland and the hermaphroJite-gland and 

 duct are very similar to those in il/. Austeai, Simr., excepting 

 that the latter is longer and more convoluted. The dart-sac 

 opens into the vestibule on the extreme left, and makes a 

 bend to the right side, passing dorsal to the penis and vagina 

 (PI. VII I. fig. 16, d.s.). It is covered by a loose muscular 

 sheath, the walls of which hide that portion passing across 

 the penis and vagina, so that at first sight it has the appear- 

 ance of entering the vestibule on the right side. Distally 



