202 Records of the Indian Museum. [Vol. X, 



between the posterior suckers, the small hooks between the large 

 hooks. The large hooks measure 0'i5 mm. " and have a pro- 

 portionately deeper notch than those of P. integerrimum.'^ 



Comparing the foregoing description with our species from 

 Kachuga lineata, it will be seen that the two species differ in that 

 P. kachugae possesses a cirrus coronet of forty equal, instead of 

 sixteen unequal pieces, and in that it measures more than twice the 

 length of P. oblongum, whereas the egg measures only half the 

 length of that of P. oblongum. The number of the cotylophore 

 hooks also is different. 



Professor Wright continues — ' ' The mouth is transversely 

 oval, and is surrounded by a well-marked sucker It leads im- 

 mediately into a bowl-shaped pharynx, the walls of which possess 

 merely weak circular fibres, and from this the simple intestinal 

 caeca arch backwards directly." 



This oral sucker appears to correspond with the first pharynx 

 of P. kachugae, the weak bowl-shaped phar^-nx with the strong 

 globular second pharynx of P. kachugae. 



The testis of P. oblongum is a small solid sausage-shaped 

 gland differing greatly from the flat lobulated testis of P. kachugae. 



In P. oblongum two lateral cushions are present situated each 

 in a depression, as in P. kachugae, which communicate with 

 vaginae leading to the centre of the body. ''A third canal 

 originating from an oval body >vith brown contents (shell gland?) 

 situated on the left side of the middle line, likewise was observed 

 to take the same direction. The ovary is situated on the front of 

 the testis on the right side of the body." The shell gland may 

 correspond with the innominate gland of P. kachugae. 



(4) Polystomum coronatum, Leidy, 1888. (Lit. No. 13). A 

 parasite of Cistudo Carolina, Gray. Three specimens were found 

 in the throat, one in the nose. "These pertain to a different 

 species from" P. oblongum, Leidy, 1888 (not the true P. oblongum, 

 Wright, 1884) " and may prove to be the P. ocellatum found in 



a similar position in the European turtle, Emys europea 



Bodv when elongated lanceolate. Caudal disk wider than the 

 body, cordiform with three pairs of bothria and with the body 

 attached between the anterior two pairs ; changeable in form to 

 oblong, circular, or quadrate ; with three pairs of minute hooks 

 between the anterior pairs of the bothria and with a larger pair 

 and two smaller pairs between the last pair of bothria. Genital 

 aperture with a circular or a transverse oval coronet of thirty-two 

 hooks of equal length. No eyes visible. Length elongated from 

 46 mm., contracting to about half the length and widening pro- 

 portionately ". 



Polystomum kachugae accordingly differs from this species in 

 the following points of anatomy, — the caudal disk is narrower, 

 not wider than the bod}^ does not bear hooks between the anterior 

 pair of suckers, bears one pair of large and one of small hooks 

 between the posterior pair of suckers. The genital aperture is 

 furnished with forty hooks, not thirty-two. 



