66 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.88 



0.18 mm. ; breadth of first testis, 0.33 mm., of second testis, 0,3 mm. ; 

 ova about 0.075 by 0.036 mm. 



Recorded from rusty dab : Linton, Bull. U. S. Fish Comm. for 1899, 

 p. 485, 1901. A reexamination of balsam mounts shows that these 

 distomes belong here. Dimensions in balsam: Length, 2.71 mm., 

 breadth, 0.84 mm. ; oral sucker, length, 0.14 mm., breadth, 0.17 mm. ; 

 pharynx, length, 0.07 mm., breadth, 0.1 mm. ; ventral sucker, length, 

 0.24 mm., breadth, 0.3 mm. ; breadth of first testis, 0.29 mm., second 

 testis, 0.28 mm.; ova, 0.084 by 0.048 mm. In the lateral view of 

 another specimen the length of the pharynx is 0.07 mm., of the esoph- 

 agus, 0.14 mm. (U.S.N.M. No. 8223). 



One (U.S.N.M. No. 8224), collected March 31, 1913, from tomcod, 

 in a lot of 75 or more distomes, all of which, except this, belong to the 

 species P. ollsoni. Dimensions in balsam : Length, 3.20 mm., breadth, 

 1.18 mm. ; length of esophagus, 0.17 mm. ; first testis, length, 0.18 mm., 

 breadth, 0.30 mm. 



Two (U.S.N.M. No. 8225), collected February 17, 1913, from 

 grubby. 



Five, collected February 3, 1915, from grubby; 8 fishes examined. 

 Two of these are immature, length, 1,85 and 1.96 mm.; lengths of 

 others, mature, 2.94 to 3.29 mm. Length of one in balsam, 3.1 mm. ; 

 breadth, 0.96 mm. ; length of esophagus, 0.24 mm. ; first testis, length, 

 0.25 mm., breadth, 0.25 mm. 



One (U.S.N.M. No. 8226), collected July 21, 1924, from common 

 gurnard. Yellowish, and minutely rugose before compression ; cirrus 

 short, seminal vesicle enclosed in cirrus bulb; posterior end of seminal 

 vesicle at anterior border of ventral sucker. Measurements in balsam : 

 Length, 2.66 mm., breadth, 0.67 mm.; diameter of oral sucker, 0.22 

 mm.; pharynx, length, 0.1 mm.; breadth, 0.13 mm.; ventral sucker, 

 length, 0.24 nun., breadth, 0.32 mm. ; length of prepharynx, 0.04 mm., 

 of esophagus, 0.13 mm. ; ova, 0.075 by 0.036 mm. 



Distomes referred to this species were collected by Vinal N. Ed- 

 wards from the Avinter flounder on 19 dates in six different years in 

 the months of February, April, May, October, and December. The 

 infestation in all cases was light. Thus, the record shows that on 12 

 dates 131 fishes were examined and a total of 97 distomes found. 

 The highest average per host on any date was less than five, when 19 

 distomes were obtained from four fishes. On four dates the record 

 for each date was one distome, although on those dates 66 fishes were 

 examined. The smallest adult with ova measures, in balsam, 1.22 

 mm., in length, the largest, 5.18 nmi. An average of six gave the 

 breadth, 0.95 mm., and breadth of first testis 0.31 mm. (U.S.N.M. 

 Nos, 8227, 8228,) 



