54 ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 



Body elongated, leaf-like, tapering at anterior end and rounded 

 at posterior end, 6.283 to 11.093 mm. in length by 0.848 to 0.953 mm. 

 in greatest width just anterior to haptor. Posterior haptor long, over 

 one half total body length, 0.953 to 1.256 mm. in width at widest 

 part, with two hooks at posterior end. These hooks measure 0.024 

 to 0.056 mm. in length and have sharp recurved points. Posterior 

 suckers 223 to 245 in number arranged along each side of haptor, 

 elliptical, broader than long, 0.072 to 0.076 mm. in length by 0.076 

 to 0.080 mm. in width. Chitinous skeleton of each sucker (fig. 35) 

 consists of fifteen pieces; one median, large; two elongated, curved, 

 in each side; two short curved pieces in base of sucker; and four 

 pairs straight, slender, chitinous rods imbedded in wall on each 

 side, equidistant from each other and in posterior half of sucker. 

 Mouth ventral, sub-terminal. Pharynx bulb-shaped, slightly longer 

 than broad, 0.056 to 0.064 mm. in length by 0.040 to 0.056 mm, in 

 width. Esophagus relatively large in diameter with several lateral 

 branches on each side, bifurcating just in front of genital pore. In- 

 testinal limbs with lateral branches, uniting near posterior end. An- 

 terior suckers elliptical, longer than broad, without membranous 

 septa, 0.080 to 0.108 mm. in length by 0.044 to 0.048 mm. in width. 

 Genital pore well forward about one third distance from anterior 

 end to vitellaria. Genital atrium a large, globular cavity heavily 

 armed with numerous (several hundred) spines 0.020 to 0.048 mm. 

 in length, elliptical, twice as wide as long (fig. 33). Vas deferens 

 dorsal to the uterus, opening at the flattened tip of an irregular glob- 

 ular-shaped papilla which projects into cavity of genital atrium. This 

 papilla may be the homologue of the cirrus of other forms. It appears 

 to be muscular. Testes fifty-three to eighty-five in number, relatively 

 small, irregular, smooth, posterior to ovary. Ovary situated at about 

 middle of body in mid-line forming an inverted U, right arm shorter 

 and of greater diameter than left arm, left arm with distinct en- 

 largement at posterior end. Oviduct arises from lower end of right 

 arm. Vitellaria relatively fine, acinous, extending from posterior part 

 of anterior fifth of body to posterior end of animal, confluent be- 

 hind, separated in front. Yolk ducts unite in mid-line at level of 

 posterior third of ovary. Common yolk duct relatively short and 

 slender. Eggs elliptical, over twice as long as wide, 0.140 to 0.208 

 mm. in length by 0.052 to 0.084 mm. in width, long polar filament 

 at each end. Eggs vary in number from several to forty-seven. Ex- 

 cretory pores open dorsally almost at extreme lateral edge of animal. 



