NEW TREMATODE PARASITES OE P.IRDS 

 By EMMETT W. PRICE 



Zflolnr/ica! Dh'ixioii. Bureau of .hiimal Industry, VS. Department of 



Agriculture 



(With One Plate) 



This is the first of several papers dealing with the parasitic worms 

 collected by the writer during the winter of 1933 while a member of 

 the scientific staff of the Johnson-Smithsonian Deep-Sea ILxpedition. 

 While on this cruise to Puerto Rico and adjacent areas, a few birds 

 were taken and examined for parasites ; these included a pelican 

 (Pelccanus occidentalis occideiifalis), a booby (Sula leucogastra), and 

 a duck {Nyroca affiiiis). Erom these hosts were collected five species 

 of trematodes that appear to be new, the preliminary descriptions of 

 which are given in this paper. A more extended discussion of these 

 forms will appear in a later paper dealing with all of the parasitic 

 worms collected l)v the expedition. 



Family HETEROPHYIDAE 

 Subfamily HETEROPHYINAE 

 GALACTOSOMUM JOHNSONI/ n. sp. 



Plate I, figs. I, 2 



Dcscripfio)!. — Body elongate, 0.97 to 1.03 mm long by 280 to 340 /x 

 wide. Cuticula covered with spines from anterior end of body as far 

 posteriorly as level of right testis. Oral sucker 60 to 90 /x in diam- 

 eter, its aperture slightly subterminal ; acetabulum absent. Pre- 

 pharynx slender. 120 to 280 fx long; pharynx well developed, ()0 /x 

 long by 40 to 50 /x wide ; esophagus 40 to 60 ju. long ; intestinal ceca 

 terminating near posterior end of body. Genital aperture median, 

 slightly preequatorial ; genital sinus occupied by a piriform gonotyl, 

 the protrusible ])ortion armed with several rows of minute spines. 



' Named in honor of Mr. Eldridge R. Johnson, sponsor of the e.\-i)edition. 



Smithsonian Miscellaneous Collections, Vol. 91. No. 6 



