PUILALAXKA. IIUTHVENIA. 25 



Lt.-Col. God win- Austen exiuniued the iinimal of a specimen 

 received from Mr. Collett. He discovered two embryonic shells 

 inside it, thus establisliing the fact tliat the species is ovo-vivi- 

 parous, a feature which it probably shares \\irh other species of 

 the jrenus. 



43. Pliilalanka? sinhila, Godwin- Aitsten. 



Latnproci/diii ? sinhila, Godwin- Austen, I'roc. Malac. Soc. London, 

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



Original description : — " Shell globose, solid for its size, scarcel\ 

 umbilicated ; 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; peristome simple ; 

 columellar margin suboblique. 



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



Hcd). 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, Gnde. 



Austenia, (nide. Science (iossip, n. s. iii. 1807, p. -"JOO, not Austeuia, 



Nevill (1878). 

 Sykesia, Gude, torn. cit. p. ',y.j2 ; ibid, vi, 1899, p. 149, not St/kesui, 



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

 Ruthvenia, Glide, Troc. 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 clathratida, Pfeiffer. 



llanqe. Southern India and Ceylon. 



Keij to the Species. 



A. One transverse parietal plate. 



a. Notched about the middle, a short support poste- 



riorly above. Habitat, Ceylon. 

 a. U uibilious wide, ribs and liraj prominent .... clatliratula. 

 /3. Umbilicus narrower, ribs and lirte obsolete . . y. compressa. 



b. Not notched. 



a. Straijrht, without support, umbilicus still nar- 

 rower. Habitat, India clathratidoide'' 



/3. Sinuous, wit h a short support anteriorly above ; 



umbilicus still narrower. Habitat, India . . retifera. 



