1918.] N. AnnandAle : Molluscs of the tnle Lake. 129 



ridges. The longitudinal striae are coarser and more irregular on this 

 whorl and have sometimes almost the character of low ridges. 



Measurements of shells. 



Total length ... ... ... 



Greatest breadth 



Length of spire (on dorsal surface) 



Length of aperture 



Breadth of aperture ... 



Type-speci)iien. M. 11037/2, Zoological Survey of India (Ind. 

 Mus.). A cotype in the collection of the Geological Survey of India. 



Four shells of this species, two of which are immature, were found 

 in the cave-deposits of the Hsin-Dawng valley in red soil. 



Taia shanensis (Kobelt). 



Plate XV, figs. 14, 15 ; plate xvi, fig. 10 ; 

 plate xviii, figs. 4-6. 



1909. Vivipara shanensis, Kobelt {nee Theobald), ojx cit., p. 411, pi. Ixxvii, 



figs. 4, 5. 

 1915. Vivipara shanensis, Preston, op. cit., p. 93. 



There has been some confusion about the specific name shanensis. 

 It was first introduced into literature by Theobald in his " Catalogue " 

 (1876) as an absolute synonym of naticoides, a name which he had 

 himself used in 1865 for the species here called Taia naticoides. He 

 proposed the change of name under the impression that naticoides 

 was preoccupied in Paludina.^ Kobelt, however, in 1909, under 

 a misapprehension, revived the name shanensis, which had been 

 dropped by Nevill and other Indian authors, but applied it to a 

 dift'erent species. He did this, apparently, because he found in Moel- 

 lendorfE's collection specimens of this species labelled " shanensis " 

 and stated to have come from the " Gebiet der Shan in Hinterindien," 

 and because he was unaware that the types of Paludina naticoides, which 

 was described as from the " Upper Salween," also came from the Shan 

 States. He therefore concluded that the form shanensis was at least 

 a " sehr gute Lokalform." 



His Latin diagnosis is as follows : — 



" Testa exumbilicata, ovato-conica, solida, crassa, oblique striata, in aufractibus 

 inferis spiraliter et peculiariter costata, eostis nodosis, nitida, virescenti-fusca, subuni- 

 color vel subnigro trifasciata. Spira elata, apice acuto, nigro ; sutura distincta, inter 

 anfractus inferos subirregularis, impressa. Anfractus 7, superi 3 lentissime accre- 

 scentes laeves, conulum regularem formentes, superi subscalati, liris spiralibus rudibus 

 tribus primum laevibus, dein tuberculatis, sculpti ; ultimus postice fere 3 5 altitudinis 

 aequans, liris tuberculiferis vel sereibus tuberculorum obhquis 4-5 majoiibus nonnulhsque 

 minoribus cinctus, serie quarta peripherica peculiariter squamosa, aperturam versus 

 supra sub-declivis, snbangulatus, ad angulum productus, vix descendens. Apertura 

 irregulariter ovalis, supra accuminata, basi valde rccendens, intus concolor vel fasciata ; 

 lieristoma callo anguste nigro-marginato continuum, margine extemo tenui, acute, ad 



^ Strictly speaking he was correct in this view, for Ferussac's Paludina naticoides, 

 now placed in the Hydro biidae, has long priority. 



