6o4 Records of the Indian Mttseum. [Vol. VIII, 



there is no flagellum shown and the spermatheca rises at the 

 generative aperture. 



Stoliczka^ however, does not give the habitat of the animal 

 he dissected, but as the paper is on the land shells of Penang 

 Island, castra from that place was at the time he wrote before him, 

 thus the difference. It is very doubtful if typical castra from 

 Sikhim is the same, and has such an extended range. 



In the radula (text- fig. i, D) the central and admedian teeth 

 are small, the latter having a small cusp on the outer side, the 

 marginals are slightly longer, narrow and bicuspid 



Formula? ? i.g.i.g.i.?, there may be about 20 to 25 mar- 

 ginals, but they were so crowded together I could not count them. 

 Jaw not seen. 



I have no hesitation in removing this species from the Family 

 Trochomorphidae to the Zonitidae. Pilsbry defines the anatomi- 

 cal characters of the former " without a mucous gland," 

 '^ spermatheca on a short duct," the opposite is found in castra 

 from the Eastern Himalaya, besides which there is a flagellum in 

 the penis. I have figured {Proceedings Malacological Society, 

 vol. i, pt. 6, 1895, p. 281, pi. xix) the generative organs of Videna 

 irilineatus oi Great 'N'lcohar , bicolor of Borneo, and conicoides; it 

 will be seen they differ altogether from Sivella castra. 



Sivella castra var. koboncnsis, nov. 



Locality. — Kobo, Abor Hills. No. 6013, Ind. Mus. (5. W. 

 Kemp). 



Shell very depressedly pyramidal, flat on base, keel sharp, 

 sculpture irregular rather distant transverse folds, fewer on base, 

 where rather close concentric striae are conspicuous, colour umber 

 brown, spire moderately high, sides flat, apex rounded, suture 

 linear. Whorls 5, very flat, regularly increasing, aperture oblique, 

 quadrate, peristome thin, columellar margin suboblique. 



Size: major diameter 8'9, alt. axis 3*25 mm. 



Only two specimens were received and one is small compared 

 with the Dafla Hill form, the nearest locality on the west, it is 

 flatter on the side of the spire and rather more tumid below the 

 keel, but not nearly so flat on the base as in Sivella castra of 

 Sikhim. More specimens are required and in a fuller stage of 

 growth to show the variation. 



Family HELICIDAE. 

 Landouria, gen. nov. 



Type : H. huttoni, Pfr. 



A dart-sac with accessory glands is not present. The penis 

 is short with short epiphallus, flagellum and vas deferens, the 

 spermatheca swollen at the base of a thin duct terminating in a 

 globose sac. 



