TREMATODES FROM FISHES — LINTON 75 



Measurements in balsam : Length, 1.56 mm. ; breadth, anterior, 0.09 

 mm. ; at level of ventral sucker, 0.4 mm., at level of ovary, 0.21 mm., 

 at level of second testis, 0.17 mm., near posterior end, 0.11 mm. ; oral 

 sucker, length, 0.07 mm., breadth, 0.08 mm.; pharynx, length, 0.05 

 mm., breadth, 0.04 mm.; ventral sucker, length, 0.14 mm., breadth, 

 0.15 mm.; first testis, length, 0.15 mm., breadth, 0.12 mm.; second 

 testis, length, 0.17 mm., breadth, 0.14 mm. ; ventral sucker to ovary, 

 0.24 mm. ; second testis to posterior end, 0.26 mm. 



Host. — Chinook salmon {OncorJiynchus tscJiawytscha) . 



One (U.S.N.M. No. 8246), found on slide with specimens of 

 Genarches infir'mus, from young salmon, Sacramento Basin, Calif., 

 May 1900. 



Genus CYMBEPHALLUS Linton, 1934 



The genus Cynibephallus differs from Podocotyle in having a 

 muscular sucker at the opening of the ejaculatory duct and a raised 

 border surrounding the ventral sucker, this border being more or less 

 scalloped, papillate, or fimbriate. 



CYMBEPHALLUS VITELLOSUS (Linton) 



Plate 2, Figures 18-20 



Distomum vitellosum Linton, Bull. U. S. Fish Comm. for 1899, p. 290, figs. 38, 

 39, 1900; ibid., p. 416 (page references to hosts in Woods Hole, Mass., region), 

 figs. 333-340, 1901; Bull. U. S. Bur. Fish., vol. 24, p. 335 (page references 

 to hosts in Beaufort, N. C, region), figs. 17&-178, 1905; Proc. U. S. Nat. 

 Mus., vol. 33, p. 105, figs. 63, 64 (notes on parasites of Bermuda fishes), 

 1907.— Sumner, Osbtjrn, and Cole, Bull. Bur. Fish., vol. 31, pt. 2, p. 584 (list 

 of hosts in Woods Hole region), 1911. 



Cymbephallus vitellosus (Linton), Journ. Washington Acad. Sci., vol. 24, p. 81, 

 1934. 



Body smooth, of various shapes, often in living specimens with 

 breadth one-third the length; under pressure, or when placed in 

 fresh water, they tend to become turgid and may elongate until the 

 length is six or more times the breadth; frequently tapering to a 

 blunt point posteriorly; neck tapering, short-conical, often reflected 

 dorsally in turgid specimens. Ventral sucker larger than oral, 

 average ratio about 8 : 5, surrounded by a raised border, which may 

 appear to be sinuous, or may be seen to bear four or five lobes on 

 the posterior border and about four on the anterior border, often 

 inconspicuous in mounted material. In turgid specimens the ventral 

 sucker may be more or less prominent, or even pedicellate. Pharynx 

 usually a little longer than broad, and a little less than the oral sucker, 

 average ratio about 4 : 5. Prepharynx very short or none ; esophagus 

 as long as or longer than pharynx. The intestines reach nearly to the 

 posterior end, usually hidden by the dense vitellaria. Genital pores 



