1918.] 



E. Ghosh: Studieii on Infusoria. 



133 



dentate in the anterior and slightly notched in the posterior half. 

 Peristome in the anterior portion of the notch, short and tubular, 

 being directed forwards, and to the left. Generally a dark granular 

 zone in the anterior one-third of the endoplasm. Longitudinal striae 



Fig. 3. — Coiuhophlhirus luniclliden-:, sp. nov. 



very distinct, specially in the anterior half of the left margin. 

 Macronucleus oval or triangular, posterior and subterminal, C. V. one, 

 subcentral, generally in the middle third of the body-length at its pos- 

 terior end. Length 0-09 mm. 



Conchophthirus curtes, Engelmann. 



My specimens differ from the specimens described by Engelmann 



in the following points : The oval 

 macronucleus is mostly j)laced with 

 its long axis in the same line as the 

 long axis of the body. C. V. without 

 accessory vesicles. The cytopharynx 

 is not only directed backwards (to 

 the right side) but also curves pos- 

 teriorly at a little distance behind the 

 macronucleus. 



Fig. 4. — Conchophthirus curies, Engelm. 



The species of Conchophthirus are thus raised to 8 in number. They 

 may be tabulated in the following synopsis : — 



a. Peristome in the anterior body half far removed forward from the middle of 

 the body-length. 



a^. Peristome widely cup-shaped, at the anterior end of the left side ; a 

 small fascicle of bristles anteriorly ; macronucici 7 in number (monili- 

 form 1) ; C. V. sub-central ; body oval, body length^l j times the width, 

 length 0-13 to 0-093 mm. 



1. C. skenstrupeh Stein. 



