TREMATODES FROM FISHES — LINTON 53 



Collected by Vinal N. Edwards on four dates in September, two 

 in October, and one in November; eight fishes were examined and 

 62 distomes obtained. The greatest number on any one date was 47 

 from two fishes, collected on October 6. For the other dates the 

 numbers recorded are 7, 2, 1, 3, 1, 1; one fish having been examined 

 on each date (U.S.N.M. Nos. 8199-8200). 



STEPHANOSTOMUM FILIFORME, new species 



Plate 3, Figures 26-28 



Variable in length, slender, and nearly linear ; oral spines about 44 

 to 48, number not exactly determined ; coarse spines on neck, few and 

 scattered toward posterior end ; length of oral spines about 0.06 mm., 

 of neck spines 0.03 mm.; neck variable, but relatively short; pre- 

 pharynx long; esophagus short or lacking; intestines reach to pos- 

 terior end ; ventral sucker larger than oral ; genital pore in front of 

 ventral suckers ; cirrus pouch and seminal vesicle long, equal in some 

 cases to one third the length of the postacetabular region; testes 

 near the posterior end, one following the other with but little inter- 

 val between; ovary separated from the first testis by a greater or 

 less interval; early folds of the uterus in front of ovary contain 

 sperm; vitellaria diffuse, filling tlie posterior two thirds or more of 

 the postacetabular space, but not reaching as far forward as the 

 ventral sucker; uterus with many but not numerous ova in front of 

 ovary. 



Measurements of one of longer specimens in formalin: Length, 

 15 mm., breadth, of oral circle of spines, 0.28 mm., behind circle of 

 spines, 0.21 mm.; maximum breadth, 0.44 mm.; distance of ventral 

 sucker from anterior end, 2.1 mm. 



Measurements of one of shorter specimens in balsam: Length. 

 8.22 mm.; breadth, oral circle of spines, 0.22 mm., behind circle of 

 spines, 0.14 mm., at level of ventral sucker, 0.38 mm., at level of testes, 

 0.49 mm.; distance of ventral sucker from anterior end, 1.12 mm., 

 from ventral sucker to vitellaria, 2.12 mm., from second testis to 

 posterior end, 0.35 mm. ; ovary, length, 0.19 mm., breadth, 0.18 mm. ; 

 first testis, length, 0.7 mm., breadth, 0.25 mm.; second testis, length, 

 0.74 mm., breadth, 0.28 mm. 



Type s'peciiner\s. — U.S.N.M. No. 8202 (holotype and paratypes). 



Hosts. — Great amberfish {Senola lalandi), crevalle {Oaranx hip- 

 pos), cocinero {Paratractus caballus). 



Record of collections. — Five, collected August 14, 1906, from 

 amberfish; 10 to 12 mm. long, much macerated. Twenty-eight 

 (U.S.N.M. No. 8202), collected September 20, 1910, from amberfish; 

 three fishes examined. 



