482 Records of the Indian Museum. [Vol. XXII, 



1897. Viiiipara javanica van moussoiii, von Martens, op. cit,, p. 22. 

 iqoq. Vivipara javanica moussoni, Kobelt, o/;. f;Y., p. 256, pi. lii, figs. 

 10, II. 



This interesting variety is represented b}^ two lots of speci- 

 mens. Of tlie iirst lot collected by Mr. den Doop atMedan (Deli), 

 the specimens are mostly brownish in colour. A few. however, 

 have a darkish colour owing to a clayey deposit on the surface. 

 The apex of the shells is, in most cases, eroded, and many show 

 rather low varices in the regions of growth. A very low but dis- 

 tinct keel is present near the lower edge of the body-whorl ; it is 

 better marked in some specimens than in others. The operculum 

 resembles Kobelt's figure. The largest specimen of this lot 

 measures 29'! mm. by 22"5 mm., the aperture being 14-6 mm. by 

 12 mm. 



The second lot of specimens was collected near Medan by 

 Mr. J. B. Corporaal. The shells are rather smaller and much 

 lighter in colour than those in the other lot.. 



var. scalaris, Mousson. 



igog. ]'ivip(ira jnvanica scalaris, Kobelt, op. cit., p. 237, pi. liii, figs. 

 I, 2, pi. 1\'. fiys. 8, g. 



This beautiful variety has a highly evolved type of shell. 

 It is represented in the collection by a few young shells and some 

 adults collected from the fresh- water lake, Anak Laut (Sabang). 



The shells are of an olive brown colour with a few vertical 

 stripes of a darker shade more marlced on the body-whorl than on 

 the rest of the shell. The adult shell consists of 6 -6i somewhat 

 inflated whorls, with a deeply impressed and oblique suture, and 

 with a large body-whorl ; the keel on the body-whorl is more dis- 

 tinct in young than in fully-grown adults, in which it becomes 

 even quite obsolete. The shells are broadly rimate and perforate. 

 The largest specimen measures 33-4 mm. by 22-6 mm., and the 

 aperture is 18 mm. by 15-5 mm. in size. 



The variety was hitherto known from Java only. 



var. borneensis, Kobelt. 



igog. Vivipara javanica borneensis. Kobelt. op. cit., p. 257, pi. Ilii, 

 figs. T,, 4, IQ, 20. 



Kobelt in the paper cited above has given a very complete 

 description of this form and pointed out its distinguishing charac- 

 ters very well. The shell is rather small, nearly smooth, ovato- 

 conical in form with an acute apex ; the whorls are very little 

 swollen and the suture is oblique and faintly impressed. 



The two shells that I identify with borneensis are from near 

 }.Iedan. They agree closely with figs. 3, 4 of the Bornean shells 

 in Kobelt's Monograph. 



