SUCCINEA. LITHOTIS. 457 



456. Succinea ceylanica, Pfeiffer. 



Succinea ceylanica, Pfeiffer, P. Z. S. 1854, p. 297 ; ibid., Mon. Helic. 



Viv. iv, 1859, p. 810 ; Nevill, Enum. Helic. Ceylon, 1871, p. 3 ; 



Hanley & Theobald, Conch. Ind. 1876, pi. 158, fig. 10; Nevill 



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



p. 443 (var.). 

 Succinea ( Tapada] ceylanica, Pfeiffer & Clessin, Nomencl. Helic. 



Viv. 1881, p. 413. 

 Neritostoma ceylanicnm, Jousseaume, Mem. Soc. Zool. France, vii, 



1894, p. 269. 



Original description : " S. testa ovato-comca, solidula, distincte 

 striata, diaphana, hyalino-albida, plerumque luto obducta ; spira 

 eonica, submucronata ; anfract. 3 cum apice punctiformi, superis 

 convexis, ultimo f longitudinis formante, basi parum attenuate ; 

 columella angulatim a ventre anfractus penultinii recedente, sub- 

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

 dextro regulariter arcuato. 



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



Hob. Ceylon (Layard) ; Kandy (Nevill). Nicobar Islands : 

 Batte Malve (var. Godivin- Austen). 



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

 Cumin g collection. These are probably part of the original con- 

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

 6-75x4x3-5 mm. 



Genus LITHOTIS, Blanford. 



Lithotis, Blanford, A. M. N. H. ser. 3, xii, 1863, p. 186 (as 

 subgenus 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. 3-6 

 (jaw and radula of L. rupicola) Fischer, Man. Conchyl. 1883, 

 p. 492 (as genus). 



TYPE, Succinea (Lithotis) rupicola, Blauford. 



Range : Central India. 



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

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

 corresponding furrow internally ; whorls l;j-2i ; aperture large, 

 ovate ; peristome simple, acute. 



Bland and Binney have examined the jaw and radula of 

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

 pression 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 striae, but no trace 

 of ribs." 



| iThe 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 



