76 



ZONITID.t. 



114. Ratnadvipia irradians, Pfr. (Vitrina) P. Z. S. 1852, p. 156 ; 

 id. (Vitrina) Mon. Hel. iii,* 1853, p. 3; id. t. c. vii, 1876, p. 14; 

 //. $ T. (Vitrina) C. /. 1876, p. 29, pi. 66, figs. 8, 9 ; Godwin- 

 Austen, Mol. Ind. ii, 1898, p. 93, pi. 85, figs. 1-8 (animal & 

 anatomy); Cottinge, Jour. Mai. viii, 1901, p. 65, pis. 5, 6 (anatomy). 



Shell imperforate or subperforate, depressed, thin, diaphanous, 

 dull brownish horny above, striated and decussated with rather 

 uneven impressed lines, rather paler, smooth, and polished beneath; 

 spire scarcely raised, suture impressed ; whorls 4, flattened above, 



Fig. 39. Eatnadvipia irradians. 



rapidly increasing, the last much broader than the others, rounded 

 at the periphery, convex beneath ; aperture large, very oblique, 

 luiiately oval ; peristoine simple, thin, the upper margin arcuate, 

 colurnellar margin regularly curved, briefly reflected close to the 

 junction with the body-whorl. 



Major diam. 24, min. 19, axis 11 mm. 



Hab. South-western Ceylon, Kandy ( Collett) ; Peradeniya (Free- 

 man). There are specimens in the British Museum said to be 

 from Southern India, but the locality is regarded as very doubtful. 



115. Ratnadvipia ? edgariana, s. (Vitrina) A. M. N. H. (2) xii, 

 1853, p. 93 ; Pfr. (Vitrina) Mon. Hel. iv, 1859, p. 792 ; Nev. (Heli- 

 carion) Hand-l. i, 1878, p. 15. 



" Shell much depressed, very thin, membrauaceous beneath, 

 highly polished, pellucid, striated obsoletely and obliquely above, 

 ornamented by a few impressed spiral lines, yellowish horny ; 

 spire rather flat, apex prominent, suture impressed ; whorls 3, 

 rapidly increasing, somewhat flat, the last very convex at the 

 periphery ; aperture oblique, ovately lunate. 



" Major diam. 10, minor 8, height 4mm." (Benson, in Latin.) 



Hab. At Colombo, Hangwelle, and Eatnapura in the island of 

 Ceylon. 



It is very difficult to form any idea of the affinities of the 

 present species. The presence of spiral impressed lines may 

 indicate a relationship with It. irradians. Unfortunately no 

 specimens are available for examination. 



