NO. 14 MANTER: DIGENETICTREMATODES OF FISHES 385 



1:2. Prepharynx very short; pharynx large, muscular, 0.130 to 0.170 

 long by 0.088 to 0.094 wide; esophagus short; intestinal bifurcation a 

 short distance anterior to acetabulum; ceca wide, extending to near pos- 

 terior end of body. Genital pore only slightly to left of midline, a short 

 distance anterior to acetabulum, opposite left cecum, close to intestinal 

 bifurcation. Testes smooth, rounded, diagonal, immediately posterior to 

 midbody ; posttesticular space 0.270 to 0.487. Cirrus sac clavate, extending 

 diagonally in space between intestinal bifurcation and acetabulum, some- 

 times overlapping anterior border of acetabulum slightly or only reaching 

 to acetabulum, containing a large, tubular, sinuous seminal vesicle, fairly 

 well-developed prostatic cells, and a muscular, sinuous cirrus which ex- 

 tends approximately 34 length of cirrus sac. Ovaiy veiy distinctly divided 

 into rounded lobes which seem to be almost completely separated. Usually 

 3 lobes can be seen, but in one specimen there were 4, one of which per- 

 haps represented the central body of the ovary; the other 3 lobes were 

 chiefly posterior to it. Ovary located to right of anterior testis and may 

 even overlap posterior testis; seminal receptacle spherical or ovoid, imme- 

 diately anterior to ovary; vitellaria begin abruptly at level of posterior 

 edge of acetabulum and extend, close together, dorsal, ventral, and lateral 

 to ceca to posterior end of body; uterus preovarian but usually overlap- 

 ping anterior testis; metraterm extending from genital pore to anterior 

 edge of acetabulum ; eggs thin shelled, almost rounded, almost colorless, 

 without constant ribs or folds, sometimes truncate at one end, 36 to 43 by 

 26 to 32 [X. Excretory vesicle extending to slightly in front of ovary. 



The name breviformis refers to the rather short body. 



Comparisons. The Podocotyle species most similar to P. breviformis 

 are P. atherinae Nicoll, P. pearsei Manter, P. levinseni Issaitschikov and 

 P. blennicottusi Park. P. breviformis differs from P. pearsei in the shape 

 and position of the ovaiy, in its much shorter esophagus, in location of the 

 intestinal bifurcation, in its much shorter and wider eggs, and in poste- 

 rior extent of cirrus sac. P. levinseni differs in shape and location of the 

 ovary, the tandem position of the testes, the longer esophagus, and very 

 much larger eggs (80 to 95 ii as compared with 36 to 43 jx). P. brevifor- 

 mis keys to P. blennicottusi in the key offered by Park (1937), but P. 

 blennicottusi differs in shape and location of the ovary, in shape and loca- 

 tion of the testes, in different posterior extent of the cirrus sac, in anterior 

 extent of vitellaria, and in egg size. P. breviformis is most similar to P. 

 atherinae, named by Nicoll (1914) as a species inquirenda. The two 

 agree in body form, diagonal testes, and position of ovaiy but differ in 



