60 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



laria in front of which is a slight constriction, 5.113 to 7.540 mm. in 

 length to 1.082 to 1.300 mm. in greatest width, with papilla-like tip 

 at anterior end. Surface of body smooth except ventral side with 

 several hundred close, simple, sharply recurved hooks located around 

 genital pore and extending from brain to ovary and laterally to 

 inner borders of intestinal limbs. Posterior haptor triangular, ap- 

 proximately one third total body length with twenty-seven to twenty- 

 nine suckers on short side and thirty-eight to forty on long side. 

 Posterior suckers 0.080 to 0.092 mm. in length by 0.140 to 0.184 mm. 

 in width. Chitinous framework (fig. 49) consists of five main pieces, 

 two curved, relatively heavy pieces on each side, one central piece Y- 

 shaped at each end, and a short stout piece distal to paired lateral 

 pieces, convex distally and inner end pointing toward mid-line of 

 sucker. Anterior suckers far apart, broader than long, without septa, 

 0.076 to 0.092 mm. in length by 0.120 to 0.168 mm. in width. Mouth 

 small, subterminal, ventral. Pharynx bulb-shaped, longer than 

 broad. Esophagus slender with few lateral branches bifurcating ap- 

 proximately halfway between brain and genital pore at level of 

 excretory pores. Intestinal limbs extending into haptor region, with 

 lateral branches ununited. Genital pore in mid-line halfway from 

 anterior end to vitellaria, unarmed except for the spines mentioned 

 above. Testes posterior to ovary to anterior end of short side of 

 haptor, ninety-three to 105 in number, close together, oval, unlobed. 

 Ovary in mid-line just in front of testes extending anteriorly from 

 oviduct region on right side winding horizontally six times, then 

 turning abruptly to left at right angles to right arm and after pass- 

 ing horizontally to left, again turning abruptly posteriorly, it then 

 bends and passes obliquely anterior and to right and after reaching 

 uterus passes dorsal to it and again bends obliquely posterior and 

 to right with slight enlargement at lower end of left arm. Vaginal 

 opening in mid-line on dorsal surface, unarmed, halfway from con- 

 striction at anterior fourth of body to anterior border of vitellaria, 

 opening into two ducts which extend to right and left in horizontal 

 plane expanding laterally and bending posteriorly about midway to 

 lateral borders of animal. It was not possible to follow them pos- 

 teriorly. Vitellaria in two distinct groups from constriction at level 

 of anterior fourth of animal to posterior border of testicular region, 

 one third of width of animal in mid-line free from them for entire 

 length. Yolk ducts unite to form common duct at middle of vitellaria 



