SUCCIXEA. LITHOTIS. 457 



45(). Succinea ceylanica, Pfeiffer. 



Sucdneacei/Ianicd, Pfeiffer, P. Z. S. 1854, p. ■297; ibid.,Mon. Helic. 



Viv. iv/l8oi», ]). 810: Nevill, Eninn. lielic. Ceylon, 1S71, p. -'5; 



llaulev & Theobald, Conch. Ind. 1876, pi. 158,% 10; Nevill 



Hand "List, i, 1878, p. 212; Godwin-Austen, P. Z. S. 1895, 



p. 443(var.). 

 Succinea (Tapada) cei/kmica, Vieiffev k Clessin, Xomencl. Ilelic. 



Viv. 1881,p. 413. 

 Kerifostoma ceylanicum, Jousseaume, 31ein. Soc. Zool. France, vii, 



1894, p. 269. 



Original description : — " S. teslii ovato-conica, solidula, distincte 

 striata, diapliana, liyalino-albida, plennnqiie luto obdiicta ; spira 

 c'onica, submucronata; anfract. 3 cum apice punctit'ormi, supens 

 convexis, ultimo | longitudinis formante, basi pavum attenuate ; 

 columella anoulatim a ventre ant'raetus penultimi recedente, sub- 

 stricta ; apertura obliqua, angulato-ovali ; perist. simplice, margine 

 dextro regulariter arcuato. 



" Long. 7i, lat. 4, alt. 3^ mill." (Pfeiffer.) 



Hah. Ceylon {Layanl)~, Kandy {^'evill). Nicobar Islands: 

 Batte Malve (var. God win- Austen). 



Three shells, collected by Layard, with Pfeifier's label are in the 

 Cuming collection. These are probably part of the original coii- 

 signment, but none of them can be the type as they measure only 

 6-75x4 x;3-o mm. 



Genus LITHOTIS, Blaaford. 



Lithotis, Blanford, A. M. ^■. fl. ser. 3, xii, 1863, p. 180 (as 

 subgeuns of Succinea); Bland & Binney, Ann. Lye. Nat. 

 Hist. New York, x, 1874, p. 346 (jaw and radula) ; Binney, 

 Proc. Acad. Nat. Sci. Philadelphia, 1874, p. 54, pi. 5, figs. 3-0 

 (jaw and radida of L. lupicola) ; Fischer, Man. Conchyl. 1883, 

 p. 492 (as genus). 



Type, Succinea (Lithotis) rujricola, Blanford. 



Range : Central India. 



Shell auriculate-ovate, thin, with a very short spire, a supra- 

 peripheral keel extending from the apex to the aperture, with a 

 corresponding furrow inrernally ; whorls l\-'2\', aperture large, 

 ovate ; peristome simple, acute. 



Jiland and Binney have examined the jaw and radula of 

 L. rupicola and state that the former is " arcuate, with a de- 

 ])ression or excavation at the centre of its upper margin ; scarcely 

 attenuated towards the ends ; cutting edge with a decided median 

 projection; anterior surface with vertical stria*, but no trace 

 of ribs.'' 



The lingual ribbon they find " as usual in the Helicinae, the 

 marginal teeth being quadrate, not aculeate. The centrals are 

 long and narrow, with lateral expansions at the lower margin ; 

 the reflected portion has one stout median cusp with a point 



