INDRELLA. 49 



Type, /. ampulla (Bs.). 



Range. AVestern slopes of Syhadri Range in Malabar. 



Shell Vitrina-IWQ., imperforate, with few whorls and a very 

 large aperture. 



Animal similar to that of AriopJianfa, but larger, not full}'' 

 retractile within the sliell. Mucous pore of moderate size ; no 

 distinct overhangiing lobe or a small one. Sole undivided, very 

 smooth. ]Vo shell-lobes ; dorsal lobes- well developed, the left 

 divided into an anterior and a posterior part by a deep sinus. 

 Kale-sac small, receiving the vas deferens; retractor muscle attached 

 to long straight caecum given off at the junction of the flagellum 

 of the male organ. Spermatheca oval, very short, on a short 

 stem. A material organ (dart-sac) stout and long. Jaw straight, 

 with a slight convexity ou cutting-edge, no median projection. 

 Eadiila broad, with about 100 rows of teeth: 145 . 17 . 1 . 17 . 145; 

 median tooth and the 17 on each side (admedians) long, broadly 

 pointed, straight-sided, lateral cusps indistinct ; laterals curved, 

 aculeate, outer laterals bicuspid. 



77. Indrella ampulla, Bs. (Helix) A. M. N. H. (2) v, 1850, p. 213 ; 

 Pfr. (Helix) Mon. Hel. iii, 1853, p. 27 ; id. t. c. iv, p. 9 ; id. t. c. 

 vii, 1876, p. 57 ; Blf. J. A. S. B. xxxiv, 1866, p. 39 ; H. ^- T. 

 (Helix) C. I. pi. 25, tig. 4 ; Nev. (Xanina) Rand-l. i, 1878, p. 54 ; 

 Godwin-Austen, Proc. Mai. Soc. iv, 1901, p. 187, pi. 18 [auitnal 

 and anatomy]. 



Shell imperforate, obliquely ovate, globose, very thin, half the 

 thickness consisting of epidermis, marked throughout with plicate 

 Hues of growth, crossed by faint impressed spiral lines, and on 



Fig. 28. —Indrella amjnilla. 



the last whorl by shallow irregular furrows, brownish olive, some- 

 times darker brown; spire small, convex, obtuse; whorls 3|, 

 rapidly increasing, the last much larger, rounded at the periphery 

 and beneath ; aperture very large, oblique, roundly oval, the same 

 colour within as without, but smooth and glossy ; peristome thin, 

 membranaceous, columellar margin much curved inwards. 



