MOLLUSC A OF INDIA. 317 



and partially reflected ; surface of the shell polished, finely striated 

 by minute lines of growth, and ornamented with longitudinal bead- 

 like lines or strings of minute bubbles, which can be seen only 

 under a strong lens. Uppersido depressed, flattened; underside 

 rounded, ventricose. Length 1| lines." 



Hyalinia, Per., 1819. 

 Sect. ZoNiTOiDES, Lehmann, 1864. 



In a paper ou new species from Ceylon in the ' Proceedings of 

 the Malacological Society of London,' July 1897, vol. ii. p. 235, 

 Mr. E. 11. Sykes described Polita notabilis with figures of the shell. 

 PL xvi. figs. 21-23. 



In March 1912, when looking through spirit-specimens in my 

 collection, I came across a tube of this species collected at Amba- 

 gamua, Ceylon. Being go interesting a form from this locality, 

 I examined the animal ; fortunately there were a good number of 

 specimens, for as they were in a brittle state, some six had to be 

 dissected before I could decide satisfactorily its generic position. 

 Mr. Sykes writes, after describing P, notabilis, as follows : — 



" It is almost hopeless to devise a description of a species of 

 this form which will prove suflScient for its recognition, and the 

 assistance of the artist must be called in, if there is to be any hope 

 of its identification by future workers. The genus FoUta, although 

 one would hardly expect to find it in Ceylon, appears conchologically 

 quite suitable, and until we are acquainted with its anatomy, the 

 species may be placed there M'ith F. nitida, &c." As will be 

 seen, this was a remarkably close identification on Mr, Sykes's 

 part. 



ZoNiToiDEs notabilis, Sykcs. (Plate CLII. figs. 2-2^.) 



The animal (figs. 2, 2 a) is dark coloured, foot not divided, 

 pointed ; not in a state to see the mucous gland if it be present ; a 

 peripodial margin with two grooves above ; right dorsal lobe small, 

 left in two nearly equal parts and narrow. 



The radula was typical of Hyalinia, having the formula 



26 . 6 . 1 . 6 . 26. 



Three specimens examined. The jaw (fig. 2 c) rather straignt in 

 front with a large central projection, rather angulate above. The 

 extreme marginal teeth are very minute and aculeate. 



In the generative organs (figs. 2 d-2 g) the most conspicuous 

 adjunct is the dart-sac; it is elongate, solid, bluntly headed, curved 

 more or less at the distal end, with a small pear-shaped coronal 

 gland, and having a long retractor muscle. Within the rounded 

 head is a pear-shaped or elongate more solid mass from the stalk 

 end of which is a thin, long, beautifully shaped, finely pointed 

 dart, the base of which is funnel-shaped (fig. 2f). The penis is 

 •seen through the transparent wall of the visceral sac lying beside 



