Ou tAvo new Amphistome parasites of Suinatran fishes. 677 



The intestinal coeca are simple and run back on eacli side to 

 tlie anterior level of tlie large sucker. They are lined with ratlier 

 high colnmnar cells which are covered with a thick layer of some 

 homogeneons material. 



The posterior sucker is rather thin-walled and has the usual 

 rauscular structure. 



Just in front of it is the ovary which g-ives off the oviduct 

 dorsally to a mass of cells, probably the shell gland, from which the 

 Laurer's canal runs backward dorsally to the median line. The 

 vitellarium lying- on each side is composed of rather coarse lobules 

 of tissue and extends forward almost to the posterior level of the 

 buccal Pouches and backward to a point a short distance in front 

 of the posterior sucker. It sends a duct from eacli side to the ovi- 

 duct where it passes the shellgland. Thence the uterus in many 

 coils passes forward, the coils being seen in front of the bifurcation 

 of the intestine. It opens by a narrow canal in the genital cloaca 

 on the ventral surface. The eggs are numeroiis and large, measur- 

 ing 0.145X0,064 mm. 



The festes are rounded and little, if at all, lobulated. They lie 

 side by side at about the juncture of the anterior and middle thirds 

 of the body. Each gives off a vas deferens which runs to the long, 

 thin-walled sac which opens into the thick-walled cirrus which is 

 evidently protrusible through the outlet of the musciilar genital 

 cloaca. 



The excretory System, as far as discernible, consists of a thin- 

 walled muscular excretory sac which opens dorsally directly over 

 the posterior sucker in the median line. Anteriorly it branches and 

 the branches are deeply pigmented, in this point resembling those 

 of the preceding form. 



The only one of Diesing's forms which could possibly be com- 

 pared with this is A. attemiatum, which is, however, larger (3,7 — 4,5 

 X2,25 mm) and tapers posteriorly to an extremity provided with 

 an oval, elongated sucker. This form was found in a species of 

 Salmo. From these differences, the description giving no particular 

 points of resemblance, I have no hesitation in concludiug that we 

 have a hitherto undescribed species, and naming it accordingly. 



