NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 411 



width. Color in life, red. Oral sucker subspherical, 0.187 to 0.277 in 

 transverse diameter, with internal conelike elevation at its base ; acetabu- 

 lum longer than wide, protuberant on a short stalk, with longitudinal 

 aperture, 0.210 to 0.270 in depth (only one specimen in a position for 

 transverse measurement which was 0.345), 0.277 to 0.472 in length. The 

 ratio of transverse diameters about 3 :4. Depth of acetabulum only slight- 

 ly greater than width of oral sucker. Short prepharynx; pharynx cylindri- 

 cal, 0.102 to 0.178 long by 0.076 to 0.136 wide; esophagus fairly long, 

 joining ceca dorsal to acetabular stalk ; intestine H shaped ; anterior ceca 

 reaching to midpharynx level or beyond to the base of oral sucker. Nine 

 dorsal diverticula of varying length at the intestinal bifurcation (fig. 97). 

 Posterior ceca wide, extending to posterior end of body, uniting with ex- 

 cretory vesicle. 



Genital pore median, opposite base of oral sucker. Testes diagonal, 

 smooth, rounded, slightly longer than wide, in middle of body (midline 

 lies between the testes), anterior testis dorsal, posterior testis ventral, sep- 

 arated by coils of the uterus and by vitellaria. Seminal vesicle a much con- 

 voluted tube extending a short distance posterior and a short distance 

 anterior to acetabulum ; pars prostatica a straight tube extending almost 

 to the genital pore; prostatic gland free; no copulatory organs. Ovary 

 ovoid or bean shaped, smooth, wider than long, median, about Y^ from 

 posterior end of body; Mehlis' gland spherical; yolk reservoir ventral 

 to Mehlis' gland; vitellaria consisting of coiled tubes with numerous 

 branches (not of isolated fragments), extending from just posterior to 

 acetabular stalk to ovary (not posterior to ovary) ; uterus with ascending 

 (ventral) coil to near acetabulum, winding descending posterior coils be- 

 coming ventral posterior to testes reaching to near posterior end of body, 

 a dorsal ascending little coiled limb which passes ventral to anterior testis 

 then almost straight to near genital pore where it joins the male duct. 

 Eggs thin shelled, light yellow, ovoid, 22 to 25 by 14 to 17 /a (one speci- 

 men with many abnormal eggs had a few up to 32 by 25 ^u,, but egg size 

 seemed rather constant in normal specimens). Excretory vesicle short; 

 excretory tubes much coiled in anterior region of body, extending to oral 

 sucker. These tubes come close together, but whether or not they unite 

 was not determined. 



The name proctocolus is from procto (== anus) and -colus (= in- 

 habiting) and refers to the location of the parasite in the rectum. 



Discussion. In the 2 mm specimen the eggs had not reached the por- 

 tion of the uterus posterior to the ovary ; hence, it was but recently sexu- 

 ally mature. The number of dorsal diverticula of the intestinal bifurca- 



