436 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



diagonally backward from sides of oral sucker. Genital pore a muscular, 

 transverse slit opposite base of pharynx. 



Testes rounded, smooth, symmetrical, far apart, wholly or chiefly ex- 

 tracecal, a short distance posterior to acetabulum. Seminal vesicle some- 

 times inconspicuous, a more or less straight tube extending from pars 

 prostatica to acetabulum. Prostate gland large, free in parenchyma, fill- 

 ing intercecal space from immediately dorsal and posterior to sinus sac 

 almost halfway to acetabulum, surrounding a finely tubular pars pro- 

 statica and small spherical prostatic vesicle. Sinus sac large, ovoid, thick 

 walled, a little larger than pharynx, overlapping intestinal bifurcation, 

 containing in its basal half a tubular, thick-walled portion of the genital 

 sinus, in its anterior half a more or less spherical portion of the duct with 

 radiating muscles. 



Ovary globular, smooth, median, halfway between testes and poste- 

 rior end of body. Flask-shaped seminal receptacle to right of ovary, ex- 

 tending anteriorly. Mehlis' gland just posterior to seminal receptacle at 

 right posterior border of ovary. Two large, compact vitellaria, smooth or 

 with only slightest indication of lobing, directly to the right of ovary, one 

 diagonally posterior to the other; anterior vitellarium more globular and 

 chiefly extracecal, partly ventral to right cecum; posterior vitellarium 

 more elongate, median to cecum, and largely posterior to ovary. Uterus 

 extending backward to a level opposite posterior edge of hind vitellarium, 

 then forward in transverse coils, straightening opposite acetabulum, again 

 coiling between acetabulum and sinus sac. Eggs 31 to 37 by 10 to 15 /x. 



Excretory pore subterminal; excretory vesicle at first wide, then 

 abruptly narrowing and bending to the left as if it were a left branch, 

 then extending forward dorsally, forking opposite anterior ends of testes. 

 The two crura diverge to pass lateral to acetabulum. Anterior to acetabu- 

 lum they become greatly inflated and convoluted, filling body lateral to 

 ceca and overlapping ceca. One of these folds on each side is longer than 

 the others and corresponds to the pronounced bend of these organs in 

 Leurodera decora. The crura unite dorsal to the oral sucker. 



The name pacifica is for the locality. 



Comparisons. This species is very similar to the Atlantic form and is 

 the only other species yet known in the genus. It dififers from L. decora in 

 more broadly rounded posterior end, more anterior genital pore, larger 

 prostate gland, in slightly larger acetabulum, in unlobed vitellaria, in the 

 intercecal position of the posterior vitellarium, and in slightly smaller 

 eggs. While the crura of the excretory vesicle are more inflated in L. 



