C)2 LAND ANB FUESHWATEK 



which are nevertheless quite distinct, collected in Pulo Penang by 

 Dr. Cantor, and by Dr. Jerdou in Southern India." 



Localit)j. Meetan, under the Mule-it Eange, Tenasserim : very 

 abundant (0. Limborg). 



Shell very narrowly perforate, ovately globose. Sculpture smooth 

 on last whorl, with regular shallow ribbing under a strong lens ; 

 the apical whorls are regularly and finely striate, crossed by fine 

 oblique ribbing, and almost decussate. Colour, when living, pale 

 greenish ochre, whitish towards the apex ; with animal removed, 

 very pale ochraceous. Spire low, convex. Suture rather shallow. 

 Whorls 3| to 4, adpressed, well rounded. Aperture broadly ovate, 

 oblique. . Peristome thin ; columellar margin rounded, slightly 

 reflected, not at all solid. 



Large specimen : major diam. 9, minor diam. 7'2, alt. axis 4-5 mm. ; 

 diam. aperture 5-7, alt. aperture 5-0 mm. The ordinary size is 

 7'0 major diameter. 



Living animal. Pale ochre, with a dusky line on the upper part 

 of the extremity of the foot, also on the neck ; tentacles moderately 

 long ; foot with mucous gland (Plate LXXVI. fig. 2 h), lobe over it 

 moderate. A broad tongue-like expansion {r.s.l.) on the right side 

 of the aperture, another on the left margin of the mantle (l.s.l.^ 

 which is reflected over the edge of the peristome and widens out 

 into a broad flap. Left neck-lobe (l.d.l.) moderate. The length of 

 the animal with a shell 0-4 in major diameter was 0*75 inch. 

 Figs. 2 and 2 a show the shell and dorsal lobes of a specimen pre- 

 served in spirit. 



The pallial fringe is very wide, the pallial line remarkably dis- 

 tinct, between two parallel grooves. The foot below has a distinct 

 central area about one-third the breadth ; the margins of the foot 

 regularly segmented, both on the outside and viewed from below. 



Generative organs (PI, LXXVI. fig. 6). Neither the ovo-testes, 

 hermaphrodite duct, nor albumen-gland have 1 been able to make 

 out in the spirit-specimens. 



The spermatheca (sp.) is short, thick, and wide at the base, with 

 a narrow neck above and a swollen round terminal portion (vide 

 Comdema, Stoliczka). The amatorial organ is large and cylindrical, 

 being twisted in form from its position in the spire of the shell ; at 

 the anterior end it terminates in a well-developed pointed knob. 

 At the posterior end is a retractor muscle ; it swells out rapidly 

 and narrows at about half the total length. Viewed by reflected 

 light (fig. 6 a) the homologue of the dart is well seen, a long, cylin- 

 drical, hard, muscular organ occupying the centre, thick at the 

 posterior end, and terminating fine and pointed. In the male organ 

 the vas deferens joins it close below the retractor muscle ; it is 

 thickened and convolute just below the actual junction, thence from 

 the retractor forwards it is a long ample sheath. 



The buccal mass is short in length, very globose in shape, and 

 rounded at the back. The jaw (fig. 4), shown very much enlarged, 

 is 0-044 in. in length, very thin and membranaceous, nearly straight 

 on the edge, with a very slight rise in the centre, convex above ; 



