TREMATODES PROM FISHES — LINTON 



149 



with the ventral sucker, in others at a considerable distance behind 

 the ventral sucker, with numerous folds of the uterus between 

 testis and ventral sucker; vitellaria in neck and extending from the 

 oral sucker to the testes, vitelline ducts continuing to the shell gland. 

 Ova, maxunimi in balsam, 0.030 by 0.018 mm. to 0.033 by 0.021 m.m. 



Table 37. — Measurements of five specimens of Orophocotyle foliata 



Measurement 



1» 



21 



31 



4> 



5» 



Length 



Maximum breadth 



Oral sucker, length 



Oral sucker, breadth 



Pharynx, length 



Pharynx, breadth 



Ventral sucker, length 



Ventral sucker, breadth 



Length ventral sucker and pedicel 



Mm. 

 15.00 

 .84 

 .63 

 .49 

 .28 

 .16 



1.33 

 .70 



1.96 



Mm. 

 16.00 



1.12 

 .67 

 .74 

 .44 

 .21 



1.40 

 .70 



1.12 



Mm. 



14.00 



.77 



.72 



.35 



.42 



.16 



1.33 



1.50 



2.10 



Mm. 



Mm. 



0.52 

 .21 

 .30 

 .15 



0.63 

 .39 

 .42 

 .23 



1 In balsam. 



' Sagittal sections. 



Host. — Ocean sunfish {Mola mola). 



Record of collections.— SeYeral (U.S.N.M. No. 8384), collected 

 July 20, 1914, from intestine of host. 



Eight (U.S.N.M. No. 8385), collected September 3, 1925, from 

 intestine of host ; lengths 8 to 22 mm. 



Twenty-seven, collected July 19, 1926, from intestine of host. 



Family DIDYMOZOONIDAE Monticelli, 1888 

 Genus DIDYMOZOON Tasclienberg, 1878 



DIDYMOZOON SCOMBRI Taschenberg 



Plate 23, Figures 305-309 



Didymozoon scomhri Taschenberg, Odhner, Surtrych ur "Zoologi-sche Stndien" 

 tillagnade T. Tullberg, pp. 311-323, text figs. 1, 2, pi. figs. 1-11, 1907. 



A tangled mass of trematodes (U.S.N.M. No. 8386), found in the 

 intestinal wall of a butterfish {Poronotus triacanthus) ., July 24, 

 1918, was straightened out on a slide and fixed under slight pres- 

 sure. The entire lot consists of seven individuals, aggregate length 

 in alcohol 264 mm. Length of one of the longest specimens in 

 balsam, 40 mm. ; breadth near oral sucker, 0.53 mm., elsewhere from 

 0.18 to 0.52 mm. ; oral sucker, length, 0.23 mm., breadth, 0.21 mm. In 

 another, diameter of oral sucker, 0.29 mm. ; breadth near oral sucker, 

 0.63 mm., for the first 2 mm. of the length; elsewhere the breadth 

 varies from 0.28 to 0.35 mm. ; rami of the intestines could be traced 

 for a short distance but were soon hidden by the uterus. In one 

 specimen, approximately 40 mm. in length, the anterior end of the 



