1918.] N. Annandale: MoJhiscs of the IvJe Lal-e. 135 



The external soft parts are precisely like those of Vivipara. The 

 radular teeth are elongate, those of the marginal and outer lateral rows 

 particularly so, and all have a rather pale brown colour. The 

 central teeth are short and broad, truncate and very slightly emar- 

 ginate above, with the sides slightly sinuous ; the lamellar projection 

 of the edge is broad, shallow and nearly symmetrical ; it has five small 

 denticulations on either side. The lateral teeth are stout, considerably 

 longer than the central teeth and produced vertically into a fine 

 process at the inner basal angle. Their lamellar process is broad, and 

 has three or four stout denticulations on either side of it. The teeth 

 of the two outer rows are sub-equal and much longer than those of the 

 inner lateral row. The inner marginal teeth are narrow and pro- 

 duced triangularly at the base ; the lamellar projection points slightly 

 inward but is submedian ; it is small and the denticulations are 

 rather feeble. The outer marginal teeth are similar in form but 

 slightly broader. Their denticulations are slender and rather long in 

 the middle of the edge, becoming gradually shorter on either side. 



Type-sj)ecimen. M. 11012/2, Zoological Survey of India {Ind. 

 Mils.). 



Habitat. This species lives in the Inle Lake. It is not found in 

 the middle of the lake, though it avoids water fouled with decaying 

 vegetation, but inhabits the outer edge of the marginal zone {i.e., the 

 intermediate zone of the lake), concealing itself amongst dense veo-eta- 

 tion. Individuals occasionally stray through the ring of floating islands 

 that surround the lake. We found a few shells in a pool in the swamp 

 at the northern end, and even in the canal at Yawnghwe. The species 

 is much less abundant than either T. intha or T. shanensis. We 

 obtained only 12 specimens. 



Taia intha, sp. nov, 



Plate XV, figs. 1-3 ; plate xvii, fig. 7 ; 

 plate xviii, figs. 10-12. 



The shell is fairly thin, of relatively small size, narrowly and 

 regularly conical, with the spire produced and tapering and the apex 

 sharply pointed ; it is not at all umbiHcate. When complete it has 

 eight whorls, but the apical whorl is minute and often disappears in 

 adult shells. It is, therefore, best ignored in reference to them. I 

 will describe the embryonic shell presently. In that of the adult the 

 first two whorls (apart from the vestigial apical whorl) are minute, 

 rounded and smooth ; the third whorl, though still very small, is as 

 long as the first and second together ; the fourth is twice as broad as 

 the third and as long as the second and third together. These four 

 whorls in a sense represent the protoconch, though they do not re- 

 present the complete embryonic shell. Below the fourth there is a 

 slight change in the direction of the spiral often accompanied by a 

 constriction of the shell. The upper part of the fifth whorl is very 

 little broader than the base of the fourth, and it does not increase 

 much in breadth towards its own base. The sixth whorl is much 

 broader and deeper, and increases gradually on to the seventh or 



