1897.] IfEW SLUGS FKOM BORNEO. 779 



Anatomy of the Generative Organs. 



The vagina is a thick-walled tube slightly constricted in its 

 upper portion ; from the louver portion the receptacular duct arises, 

 as a narrow, somewhat long tube, enlarging into a globose recep- 

 taculuni semiuis; in the example examined this was empty and 

 presented the large leaf-like appearance shown in the figure 

 (PI. XLIV. fig. 3 r.s.y The penis is short aud constricted in its lower 

 half, its upper portion being bead-Hke (PL XLIV. fig. 'dp), a feature 

 common to a large number of species, the vas deferens passes off 

 from the inner side (left-hand side) of the penis. The retractor 

 muscle has its attachment immediately above the commencement 

 of the vas deferens. The common duct formed by the oviducal 

 and prostatic canals is thrown into a series of closely wound folds. 

 The albumen-gland is somewhat ovoid in form. The hermaphro- 

 dite gland is a small oval-shaped body, attached to the thin 

 convohited tube, the hermaphrodite duct. The dart-sac is a com- 

 paratively short, wide tube, folded upon itself at its upper portion ; 

 unfortunately no dart was present. 



Affinities. 



The nearest species, as regards the internal anatomy, to this 

 species is the P. martensi, Simr., in which species (c/. PI. XLIV. fig. 4, 

 reproduced from Simroth's original figure') we have the elongated 

 form of the receptaculum seminis and a similar shaped penis. 

 P. everetti difi'ers however from P. martensi in the altogether 

 different shaped dart-sac ; in the latter species this organ is con- 

 stricted in its middle, the upper half being bent upon itself. 

 Externally the two species are quite unlike. 



Pabmaeion inteemeditjm, n. sp. 



Hab. Lombok (1500 ft.), Beww© (A. H. Everett). 



Shell oval in form, convex, membranaceous borders larger than 

 in P. everetti, and covered by the mantle, amber-coloured ; lines of 

 growth well marked, apex obscure. 



Major diam. 18-5 millim. ; minor diam. 12-5 niillim. 



Animal (PL XLIV. figs. 5 & 6) very dark green, almost black, 

 lighter beneath the mantle; sides of the body greenish brown; 

 posterior region of the body very dark green, almost black, 

 becoming lighter anteriorly. Mantle-lobes black. Eugae not very 

 prominent, elongated in the posterior region. Foot-fringe nearly 

 black, with fine yellow lineoles. Poot-sole divided into median 

 and lateral planes, the former yellow in colour, the latter almost 

 black. Caudal mucous pore a deep vertical slit, not extending to 

 the foot-sole, the sides of the pore are white (PL XLIV. fig. 7). 



Length (in alcoliol) 43 miUim. 



Anatomy of the Generative Organs. 

 The vestibule commences as a wide pouch-like cavity, from 



1 Zool. Ergebnisse einer Reise in Niedorlandisch Ost-Indien, 1893, pi. Tiii. 

 fig. 20. 



1 



