50 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



tacle dorsal and posterior to the ovary. Ova in balsam about 0.045 

 by 0.021 mm. to 0.048 by 0.024 mm. 



Table 13. — Measurements of five mounted specimens of Deropristis inflata, 

 Nos. 1-3 in ialsam; Nos. 4, 5 in glycerin 



Measurement 



Length 



Breadth of neck 



Breadth of body 



Oral sucker, length 



Oral sucker, breadth 



Pharynx, length 



Pharynx, breadth 



Ventral sucker, length.. 

 Ventral sucker, breadth 



Mm. 

 4.09 

 .43 

 .49 

 .13 

 .14 

 .11 

 .08 

 .15 

 .16 



Host. — American eel {Anguilla rostrata). 



Record of collections. — Two, collected August 14, 1905, slender, 

 yellowish, with expanded neck ; ova 0.047 by 0.023 mm. Thirty-three, 

 collected December 6, 1909, small, slender, neck inflated, spinose. 



Sixteen (U.S.N.M. No. 8197), collected November 18, 1911; length 

 in formalin 4 mm. One, collected July 31, 1912, macerated, spines 

 shed. 



One, collected August 19, 1912, orange color by reflected light, 

 rusty yellow by transmitted light; neck inflated, armed with strong 

 spines ; 6 low nodules on head. Dimensions, life : Length, 2.86 mm. ; 

 breadth, anterior 0.15 mm., neck 0.32 mm., body, maximum, 0.57 mm. ; 

 breadth of oral sucker 0.13 mm., of pharynx 0.07 mm., of ventral 

 sucker 0.16 mm. ; ova somewhat irregular, about 0.043 by 0.024 mm. 



Nine, collected March 29, 1913. Forty, collected April 8, 1913. 

 Two, collected April 21, 1913. Three, collected April 30, 1914 ; length 

 3.5 mm. in formalin. Six, collected May 1, 1914. Fifty-five, collected 

 June 13, 1914, 1.42 to 5 mm. in formalin. A few, collected July 10, 

 1914. 



DEROPRISTIS HISPIDA (Abilgaard) 



Plate 21, Figube 284; Plate 22, Figubbs 285-287 



Deropristis hispida (Rudolphi) Luhe, in Brauer's Die Siisswasserfauna Deutsch- 

 lands, vol. 17, Trematodes, p. 85, fig. 69, 1909. 



The collection contains two of these distomes, collected May 13, 

 1913, by Vinal N. Edwards from the intestine of a small sturgeon 

 {Acipenser sturio) taken at Menemsha Bight. 



The expanded neck of this species is made up largely of strong 

 muscle fibers and evidently acts as an organ of adhesion. There is 

 a cluster of stout spines on each lateral margin of the neck and 

 another on the dorsal surface about on a level with the pharynx. 



