THE TREMATODE TARASU'ES OF FISHES. 



49c 



Prosorhynchus trig-lae sp. in(|. (Fig. 5). 



Single specimens of this species were found on two occasions, once in 

 the intestine and once in the stomach of Trigla (jurruirdus. Both speci- 

 mens were quite immature, so that it is impossible to give a complete 

 description of the species, which appears to be hitherto unrecorded. 

 It measures ■2-2-24 mm. in length and -75 mm. in maximum breadth. 

 At the anterior end there is a wedge-shaped rostellum resembling that in 



KSt:i 



Fig. 5. — Prosorhynchus triglae. Ventral view x 40. C.B. Cirrus-pouch; Ex. Excretory 

 vesicle; K.St. Ovary; Ph. Pharynx; T. Testes. G. Roberts del. 



P. crucihuJum (diameter -3 mm.). The small ventral sucker (pharynx) 

 is situated nearly in the middle of the body (diameter -1 mm.). 



The intestinal sac extends forwards and is not of very large size. 

 The excretory vesicle extends about one-half or two-thirds the distance 

 between the posterior end of the body and the pharynx. 



The cirrus-pouch is about half the length of the excretory vesicle. The 

 testes are fairly large, close together and nearly tandem. The posterior 

 (left) testis is contiguous with the cirrus-pouch in one and displaced to 

 the left in the other. 



