132 Records of the Indian Museum,. [Vol. XV, 



The second one is not recognised by Scliuberg (10) as a species of 

 ConcJiophthirus the cytophaiynx of Tillina being ciliated. The third 

 species also cannot be considered to belong to the present genus. 



Schuberg also refused to admit C. curies as a distinct and separate 

 species from C. anodontae as they were found in the same host ; he 

 considered the former as a variety of C. anodontae. But as C. curies 

 has only been found in Lamellidens tnarginalis with two new species 

 of Conchophthirus (to be presently described), it cannot be considered 

 to be the same species as C. anodontae. 



Lastly three other species have been described by Certes (4), Andre 

 (1) and Mermod (9), raising the number to 6 in all. 



The two new species of Conchophthirus have been found in the 

 mantle chamber of Lamellidens marginalis with C. curtes in the same 

 specimens, the latter being exceedingly rare in occurrence. 



Conchophthirus elongatus, sp. nov. 



id, about 2J times as long as broad 



aded and sloj)ing to the back ( 



abruptly tapering and bluntly pointed at the posterior end ; right 



side nearly straight, slightly convex in front and behind, and faintly 



Body elongated, about 2J times as long as broad, wide anteriorly, 

 anterior end rounded and sloj)ing to the back (left side) ; rather 



Fig. 2. — Conchophthirus dongalus, sp. nov. 



concave in the middle ; left side with a shallow notch just behind the 

 anterior one-third of the body-length, where the peristome is situated ; 

 peristome small, elongately conical, directed forwards and to the 

 right ; longitudinal ciliary striae very marked at the anterior end, less 

 so on the remainder of the body. Macronucleus oval, posterior and 

 subterminal. C. V. single at the junction of the middle and posterior 

 one-third of the body-length, sometimes slightly displaced. Length 

 0-05 mm. 



Conchophthirus lamellidens, sp. nov. 



Body ovate, about 11 times as long as broad, bluntly pointed at 

 both ends ; right side strongly convex, left side, convex and minutely 



