48 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



hidden by the vitellaria. The genital pore is on the left of the median 

 line about on a level with the forking of the intestine. The cirrus 

 pouch is relatively large and long, its base dorsal to the ventral 

 sucker, whence it curves forward and to the left to the genital pore. 

 The testes are rounded lateral, opposite, at about the middle of the 

 postacetabular space. The specimen was slightly damaged and the 

 left testis was not clearly defined. Ovary somewhat subtriangular in 

 outline, at right lateral border of ventral sucker. The vitellaria con- 

 sist of a cluster of compact follicles on each lateral margin, from 

 about the anterior border of the ventral sucker to about the anterior 

 edge of the testes. The uterus lies between the testes and fills the 

 middle space between the vitellaria and behind the ovary, and oc- 

 cupies a considerable portion of the posttesticular space. The ex- 

 cretory pore is surrounded by deeply staining cells, but the excretory 

 vessels are not distinguishable. The granular appearance of the 

 parenchyma, especially conspicuous in the neck, is a characteristic of 

 this species. The dimensions of these bodies in this specimen are 

 rather smaller than those given by Manter, very few of them measur- 

 ing as much as 0.015 mm. in diameter. 



Measurements in balsam: Length, 1.75 mm.; breadth, at level of 

 ventral sucker, 0.62 mm., maximum about 0.7 mm. ; distance of ven- 

 tral sucker from anterior end 0.62 mm. ; diameter of oral sucker 0.14 

 mm., of pharynx 0.05 nmi., of ventral sucker 0.14 mm.; length of 

 esophagus 0.3 mm.; ova about 0.039 by 0.024 mm. 



There is also in Mr. Edwards' collection an example of this species 

 (U.S.N.M. No. 3196) from Acanthocottus octodecimspinosus ; date 

 of collecting not given. Measurements in balsam : Length, 2.35 mm. ; 

 maximum breadth, at middle of length, 1 mm.; diameter of oral 

 sucker, 0.19 mm., of pharynx, 0.06 mm., of ventral sucker, 0.021 mm. ; 

 length of esophagus about 0.4 mm. ; cirrus pouch, length, 0.45 imn., 

 breadth, 0.18 mm. ; ova 0.03 by 0.015 mm. to 0.034 by 0.018 mm. 



The ventral sucker is weak and was at first overlooked. In ventral 

 view the posterior end of the cirrus pouch with the enclosed seminal 

 vesicle can be seen plainly through its walls. The uterus is volumi- 

 nous, its folds lying between the testes and filling the greater part 

 of the posttesticular region; ova numerous. The body in front of 

 the vitellaria is filled with round, oval, and pyriform granular bodies 

 from 0.01 to 0.03 mm. in diameter ; also the excretoiy vessel, near the 

 terminal excretory pore, is surrounded by pyriform cells. 



This species has been recorded by both Stafford and Manter from 

 the halibut {Hippoglossus hippoglossus) . 



