ART. 18 THE TREMATODE FAMILY SCHISTOSOMIDAE PRICE 29 



club-shaped, sometimes branched, lateral ceca. Testes about 110 in 

 number, situated along the common cecum for its entire length. 

 Seminal vesicle long, spiral, and situated in the anterior sixth of 

 body. The genital pore is located on the left side about 1.35 mm. 

 from anterior end of body. 



Female (according to Semenov (1927) 1.5657 mm. long by 0.2875 

 mm. wide. Body divided into two parts by an irregular transverse 

 groove, the anterior portion being 0,4228 mm. long and the posterior 

 portion 1.1427 mm. long. Suckers absent. Oral aperture terminal. 

 Esophagus slightly wavy; common cecum zigzag and extending to 

 posterior end of body. Ovary 0.1028 mm. long by 0.0914 mm. wide, 

 situated iraLmediately caudad of the transverse groove and to one side 

 of median line. Vitelline follicles numerous and distributed 

 throughout posterior part of body. 



Gercai^ unknown or unrecognized. 



Hosts. — Primary, birds {Querquedula querqued<ula {'=Anas quer- 

 quedula) and Anas platyrhynchos { — A. hoschas)) ; secondary, un- 

 known. 



Location. — Blood vessels. 



DistHhution. — Africa (Dongola, Sudan), and Europe (Russia). 



DENDRITOBILHARZIA LOOSSI Skrjabin. 1924 



Specific diagnosis. — Dendritohilharzia. 



Male unknown. 



Female 14.2 mm. long by 1.41 mm. wide. Oral sucker and acetabu- 

 lum absent. Eso^^hagus 450/a long ; intestinal ceca united posteriorly 

 about 3.47 mm. from the esophageal bifurcation; common cecum as 

 in D. fulvervlenta. Genital organs, consisting of a spiral, tubular 

 ovary, and an unpaired vitelline duct, lie in the space between the 

 intestinal ceca. The vitellaria consist of follicles situated along 

 the course of the common cecum. 



Cercaria unknown or unrecognized. 



Hosts. — Primary, birds {Pelecanus onocrotalus) ; secondary, un- 

 known. 



Location. — Blood vessels. 



Distribution. — Europe (Russia) . 



This description is taken from that of Skrjabin (1924). Un- 

 fortunately very little detail is given as the description was based 

 upon a single female specimen. In discussing this species, Skrjabin 

 regards it as unlikely that this form could be identical with D. 

 pulverfiilenta because of the great difference in size. 



Genus TRICHOBILHARIA Skrjabin and Zakharow, 1920 



Generic diagnosis. — Bilharziellinae ; body slender and divided into 

 two portions; the anterior wider portion separated from the posterior 



