TREMATODES FROM FISHES — LINTON 101 



Subfamily Stephanophialinae Nicoll, 1909 

 Genus CREPIDOSTOMUM Braun, 1900 



CREPIDOSTOMUM FARONIS (O. F. Muller) 



Plate 22, Figuee 2S9 



Crepidostomum laureatum (Zeder, ISOO), Bp^mjn, 1900, Sth.es and Hassaix, 



U. S. Hyg. Lab. Bull. 37, p. 140, 1908. 

 Crepidostomum -faronis (O. F. Muller), Luhe, in Brauer's Siisswasserfauna 



Deutschlands, vol. 17, Trematodes, p. 63, fig. 54, 1909. 



Body smooth, tapering slightly to each end ; six short, blunt papillae 

 around oral sucker, four dorsal and two ventral; ventral sucker 

 lr,rgGr than oral; prepharynx very short; pharynx much smaller 

 than oral sucker; esophagus about as long as pharynx; intestinal 

 rami extend nearly to posterior end. Genital pore on median line, 

 in front of working of intestine, near posterior end of pharynx; 

 cirrus smooth, cirrus pouch extends back of ventral sucker along its 

 left border and encloses the seminal vesicle at its posterior end. 

 Testes about middle of postacetabular region, one following the 

 other, outlines more or less irregular. Ovary subglobular, a short 

 distance back of ventral sucker, to left of median line; shell gland 

 on posteromedian border of ovarj^ A yolk reservoir was noted in 

 one specimen between the left anterior border of the first testis and 

 the ovary; vitellaria diffuse, with coarse lobules filling the post- 

 testicular space and extending forward to the level of the posterior 

 end of the pharynx. Uterus between first testis and ventral sucker. 

 The metratei'm lies on the dorsal side of the ventral sucker, to the 

 right of the cirrus-pouch. Ova not numerous, average in balsam 

 0.08 by 0.04 mm. The number in three specimens in balsam was 

 32, 42, and 90, more or less, respectively. 



Host. — Brook trout {Salvelinus fontinoMs). 



Record of collections. — About 25 trout were examined for internal 

 parasites on July 4, 1905, at Alder Lake in the Catskills, New York ; 

 2 distomes found, 1 from each of two fish. (U.S.N.M. No. 8298.) 

 Measurements of one, life: Length, 2.45 mm., breadth, 1.26 mm.; 

 diameter of oral sucker, 0.32 mm., of pharynx, 0.23 mm., of ventral 

 sucker, 0.43 mm.; ova, 0.06 by 0.045 mm. When compressed the 

 greatest breadth was at about the anterior third at the level of the 

 ventral sucker, thence tapering to the buntly rounded anterior end, and 

 more gradually, to the posterior end. A slide contains three specimens 

 collected June 26, 1911, not in good condition. My notes made dar- 

 ing my second visit to Alder Lake are missing. 



