4 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



than the anterior part of the body; pharynx small; intestines ap- 

 parently much branched, though they are so completely covered by 

 the vitellarium that they can not be plainly seen. A prolongation is 

 sent into the fixation disk and into the appendix. Genital pore small 

 and round, just behind the bifurcation of the intestinal ceca. Vaginal 

 orifices a little posterior to this level, about halfway out to the margin 

 of the body. Vaginae run back separately to the vitelline duct. 

 Ovary much lobulated and folded. There is a large and conspicuous 

 recei^taculum seminis. Ootype fusiform, very thick-walled, and dis- 

 tinct, with eight longitudinal ribs formed by deeply stained cells. 

 Uterus runs straight forward from this and contains one or two 

 eggs, which arc very large and thin-walled. They measure 320^ in 

 length and 120/x, in breadth, and have at each pole a short, stout, re- 

 curved filament about one-third as long as the egg. There are about 

 25 lobules of the testis in the midline behind the ovary. The cirrus 

 is narrow and unarmed. 



The hooks of the large suckers measure 280/u, from tip to tip (fig. 

 1, /) ; the terminal booklet is sharply marked off and is much nar- 

 rower than the large portion. The other end shows a characteristic 

 abrupt stoppage of one part of its whole thickness so that there is a 

 projecting rounded end. The two small booklets in the appendix are 

 stout, with long recurved point and very blunt short branches at the 

 base. They measure 72/x, in length (fig. 1, /'). 



The excretory system can be seen to open on the dorsal surface, far 

 antero-laterally by an orifice on each side surrounded by a sharply 

 outlined mass of cells. 



It is difficult to fit this form into Cerfontaine's genera. It has a 

 small rounded oval sucker with transverse slit, followed by a small 

 pharynx. The genital organs are unarmed ; there is an ootype with 

 longitudinal ribs and faint longitudinal markings to correspond on 

 the egg. But the egg, instead of ending in a small tubercle, has at 

 each end a short recurved filament. Vaginal orifices are on a level 

 with or slightly behind the genital atrium ; the vaginae do not unite 

 to form a single tube but run back separately to enter the yolk duct. 

 The alimentary canal sends a prolongation into the fixation disk, 

 but does not ramify there. And this has not been foflnd as a para- 

 site of one of the Rajidae. It agrees, therefore, with RajoncJiocotijle 

 in the form of its mouth sucker, ootype, and general conformation, 

 but does not uphold the statement about the union of the vaginae, 

 the lack of filaments on the egg, or the habitat. On the other hand, 

 it differs from Squalonchocotyle in the form of the mouth sucker, but 

 agrees in other respects. It is probably best to class it with the latter 

 genus, temporarily at any rate, although it seems that the three 

 genera may have been based on characters not strictly separated in 

 all the forms. 



