408 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



acetabular stalk, posterior to intestinal bifurcation. Testes spherical, 

 diagonal, not far apart but separated by a few eggs in the uterus, in pos- 

 terior half of body. Cirrus sac claviform, slightly curved, extending only 

 slightly posterior to acetabulum; 0.502 long by 0.130 in greatest width 

 (near its base), containing a coiled tubular seminal vesicle in its basal 

 third; a long pars prostatica and a short cirrus. Genital atrium large. 

 Cirrus may be inserted in terminal portion of uterus. Ovary spherical or 

 subspherical, a short distance pretesticular, separated from testes by uter- 

 ine coils; vitelline follicles few, in 2 lateral groups from anterior end of 

 ovary to anterior end of anterior testis; extending medianly dorsal to 

 uterus between ovary and testis; eggs 32 to 37 by 15 to 19 /i. Excretory 

 vesicle not traced. 



The name magnorus refers to the relatively large oral sucker. 



Comparisons. Two species of Proctoeces have been described, P. mac- 

 ulatus (Looss) Odhner, 1911 from Labrus merula and Crenilabrus pavo 

 from the Mediterranean (also reported by Yamaguti from several fishes 

 of Japan) and P. erythraeus Odhner, 1911 from Chrysophrys bifasciata 

 from the Red Sea. P. magnorus is very different from P. maculatus in 

 sucker ratio, in extent of vitellaria, and in egg size. It is more similar to 

 P. erythraeus. Odhner gives a very brief description and no figure of 

 P. erythraeus. Compared with P. maculatus, the acetabulum is "at least 

 Ys smaller," eggs about 45 /x long, and the vitellaria shorter. These differ- 

 ences are all in the direction of P. magnorus, which, however, seems to 

 have a larger oral sucker, making the sucker ratio even greater than in 

 P. erythraeus, and also to have smaller eggs (the largest of which is 37 fi 

 long) . It is probable the vitellaria are even shorter in P. magnorus than 

 in P. erythraeus. Assuming the other 2 species are alike in other respects, 

 P. magnorus shows slight differences in possessing an acetabular stalk, 

 shorter esophagus, cirrus sac not reaching ovary, and a longitudinal 

 groove within the acetabular cavity. 



Tergestia laticolHs (Rud., 1819) 



Host: Caranx caballus Giinther 

 Location : Intestine 

 Locality: Port Culebra, Costa Rica 

 Number : 5 specimens from one host 



The genus Tergestia was named by Stossich in 1899 with T. laticolHs 

 (Rud.) as type species. Odhner in 1911 redescribes the genus and the 



