MOLLtJSCA OF INDIA. 



81 



Mr. Edgar Smith I have been enabled to examine this specimen, a 

 very fine typical form named by Mr. E. Smith Tropklophora het- 

 sileoensis. It is a female specimen and was very difficult to extract 

 without breaking the shell, which I retrained from doing as the 

 animal was too hard to do much with. The radula proved most 

 interesting, and it differs altogether from that of Otopoma (see 

 Plate LXVII. figs. 4-4 6) even in the formula, which is (3' . 3) 

 2 . 1 . C . 1 . 2 (3 . 3'). Before receiving this, Mr. W. Moss very 

 kindly forwarded me some well-mounted examples of radulte, 

 among them one labelled Otopoma wiifasciata, Mauritius. Nevill^ 

 m 'Amended Hand- List,' records two 'specimens of this species in 

 the Indian Museum, received from the collection of Dr. Dohrn, but 

 stated to be from Madagascar. Whether the species is found in 

 both these islands is therefore doubtful. The radula of this species 



Fig. 1. — Tropidop/iora? unifasciata. 



(fig. 1) differs remarkably from that of true Otopoma (Plate LXVII. 



^tigs. 4-4 6), and is altogether a beautiful object. It indicates so 



'considerable divergence from Otopoma, that when the animal comes 



to be examined and described it may give it a very distinctive 



position among the Cyclostomidae. 



The centre tooth is broad, sides sloping inwards from the base 

 with a large centre cusp, and three smaller on each side of it ; the 

 first side-tooth has similar sloping sides, rounded above, with 'four 

 cusps ; the second side-tooth has parallel sides and is five-cuspid ; 

 instead of the usual third side-tooth there are to all appearance 

 four, the outermost being broad, like a rake in form, with very fine 

 narrow sharp-pointed teethlets, set close together, about 14 in 

 number ; the next, or true third side-tooth, is narrower, with five 

 cusps, much larger and more rounded in form, contrasting strongly 

 with those on the outermost tooth; it is also apparent that this 

 outer tooth can fold most upon itself, the inside margins bein"- 

 attached. The formula is therefore * 



3'. 3 2 ~^ 



14-6 • 5 



The radula of the Tropidopliora (fig. 2, p. 32) in the British 

 Museum, undoubtedly from Madagascar, was equally interesting, 

 as it is of the type just described, not of Otopoma. 



