PHILALANKA. RUTHVENIA. 25 



Lt.-Col. Godwin- Austen examined the animal of a specimen 

 received from Mr. Collett. He discovered two embryonic shells 

 inside it, thus establishing the fact that the species is ovo-vivi- 

 parous, a feature which it probably shares with other species of 

 the genus. 



43. Philalanka? sinhila, Godwin-Austen. 



Lamprocystis ? sinhita, God win- Austen, Proc. Malac. Soc. London, 

 ii, 1897, p. 178, pi. 14, fig. 2. 



Original description : <l Shell globose, solid for its size, scarcely 

 urn bill cated ; sculpture smooth, with a strong periostracum ; 

 colour ? (bleached). Spire low, depressedly conic, apex very 

 blunt ; suture shallow ; whorls 5, closely wound, regularly 

 increasing. Aperture narrowly lunate, vertical; peristorne simple ; 

 columellar margin suboblique. 



44 Maj. diam. 3"t> ; alt. axis 1 mm." (Godwin-Austen.) 



Hob. Ceylon : Uda Pussellawa, Watawala (Preston). 



A specimen received from Mr. Preston enables me to supple- 

 ment the foregoing description in one respect, namely, as regards 

 colour, which is pale corneous. It also shows distinct microscopic 

 spirals, and agrees therefore with the other members of this 

 group, a fact which induces me to include it here. 



Genus RUTHVENIA, Gude. 



Austenia, Gude, Science Gossip, N. s. iii. 1897, p. 390, not Austeuia, 



Neyill (1878). 

 Sykesia, Gude, torn. cit. p. 332 ; ibid, vi, 1899, p. 149, not Sykesia, 



Pomel (1883) ; Godwin- Austen, Moll. India, ii, 1907, p. 196. 

 Ruthvenia, Gude, Proc. Malac. Soc. London, ix, 1911, p. 271. 



Dextral, shell translucent, with straight acute edges, acutely 

 keeled, with one or more fringed spiral lirse. Parietal and palatal 

 armature present. 



TYPE, Helix datliratula, Pfeiffer. 



Range. Southern India and Ceylon. 



Key to the Species. 



A. One transverse parietal plate. 



. Notched about the middle, a short support poste- 

 riorly above. Habitat, Ceylon. 



a. Umbilicus wide, ribs and liras prominent .... clathratula. 

 /3. Umbilicus narrower, ribs and lirae obsolete . . v. compressa. 

 b. Not notched. 



a. Straight, without support, umbilicus still nar- 

 rower. Habitat, India , clathratuloides. 



0. Sinuous, with a short support anteriorly above ; 



umbilicus still narrower. Habitat, India . . retifera. 



