1912. ] J. HornELL: Cestodes from Indian Fishes. 203 
The following measurements are from a specimen preserved in 
alcohol :— 
Millimetres. 
Extreme length Set me 36°00 
Length of scolex without neck .. a 8°00 
Length of bothridia .. a a 2°00 
Breadth do. Ne I'60 
Length of region of coiled proboscis sheaths .. 2°00 
Breadth do do Le 0°70 
Length of contractile bulbs ae Hts 380 
Breadth of this region.. a sf I°00 
Length of neck Ne os 1°75 
Breadth of neck at anterior SGM ae ie 1°25 
Do. posterior end .. 1°00 
Length of a mature proglottis .. i 75 to 2°00 
Breadth do. including genital eminence 1°20 
This Tetrarhynchid is closely mised to T. tenuicolle, Rudolphi, 
and to T. macroporus, Shipley and Hornell. From the former it 
is sharply divergent in the much greater length of the contractile 
proboscidial bulbs, while from the latter it is equally sharply 
marked off by the form of the bothridia which is simple and 
entire in 7. annandale:, whereas in T. macroporus each is divided 
into halves. ‘The proboscis hooks in the latter appear also to be 
shorter and stouter and it is stated that there is practically no 
neck. In both the latter species the relative proportions of the 
two regions of the head are nearly the same and there is also 
approximation in the number and general form of the proglottides 
and in the great prominence of the lips of the genital pore. 
Diagnosis of T. annandalei :— 
Length 3°6cm. Head cylindrical, and fairly long, about 8 mm. 
Bothridia two, lateral, longer than broad, slightly emarginate 
on the posterior edge and with a raised and thickened margin. 
Proboscides four, long, and strongly armed with curved hooks, 
the majority long and sabre-shaped, fairly stout; a small number 
of very minute recurved forms with elongated base also present. 
The proboscis sheaths long and arranged in closely set spirals : 
this region of the head including with it the part overlaid by the 
bothridia is about equal in length to the posterior section contain- 
ing the contractile sacs. The latter region ts characteristically of 
great relative elongation and is slightly wider than the anterior head 
region. The sacs are cylindrical, with the oblique decussation of 
the muscle fibres well marked. Neck short, one and a half times 
as long as wide; greatest breadth seen in this worm occurs in the 
anterior part which increases in width abruptly immediately behind 
the contractile sacs. Neck wrinkled slightly transversely. 
Proglottides about 25. Anteriorly they are wider than long, 
but soon become square and then rapidly elongate and in the matur- 
