NO. lO NEW TREMATODES FROM MARINE FISHES PRICE 3 



head organs located at anterior end of body. Posterior haptor about 

 57 ya wide, with two pairs of large hooks sup]:)orted by two transverse, 

 heavily cuticularized bars, and with 14 marginal booklets; hooks of 

 anterior pair 30 /x long, those of posterior pair 25 /x long ; anterior 

 transverse bar almost straight, 34 1^1 long, posterior bar bow-shaped, 

 20 fx long ; marginal booklets varying from 8 to 25 /* long, the three 

 most anterior pairs much longer than the others (pi. i, fig. 4c). Oral 

 opening ventral, 75 jx from anterior end ; pharynx oval, 35 /a long by 

 20 [x wide ; esophagus very short ; intestinal branches slender, their 

 tips approaching near posterior end of body proper. Brain antero- 

 dorsal to oral opening ; eyes present, anterior pair smaller and less 

 pigmented than posterior pair. Genital aperture median, about 120 /n 

 from anterior end of body. Cirrus about 20 /t long, its morphology 

 not ascertainable. Testis elongate, about 75 /x long by 30 ^ wide, 

 postequatorial. Ovary linguiform, about 75 /x long by 30 p. wide at 

 anterior end, overlapping testis. Vitelline follicles relatively large 

 and extending from level of posterior end of pharynx to posterior end 

 of body proper. Vagina short, opening at left margin of body about 

 133 ;u, from posterior end, communicating proximally with a large 

 globular seminal receptacle. Ootype oval, median, its posterior end 

 surrounded by relatively large unicellular glands. No eggs observed. 



Host. — Allicrina araea Jordan and Gilbert. 



Location. — Gills. 



Distribution. — Samana Bay, near Santa Barbara de Samana, Do- 

 minican Republic. 



Type specimen. — U.S.N.M. Helm. Coll. no. 8806 ; paratypes no. 

 8807. 



This small delicate species was found on the gills of about one-third 

 of the specimens of Atherina area examined ; they were not abundant, 

 only two or three individuals being found on each infested fish. 



Ancyroceplialits atherinae may be easily distinguished from all 

 other species of the genus by the unequal length of the marginal hook- 

 lets of the posterior haptor ; these booklets in the other species are 

 approximately equal in length. 



REFERENCES 



Parona, Corrado, and AIonticelli, F. S. 



1903. Sul genere Ancyrocotyle (n.g.). Arch. Parasitol., Par., vol. 7, no. i, 

 pp. I17-121, pi. 3, figs. 1-6, March 15. 

 Parona, C, and Perugia, A. 



1895. Sopra due nuove specie di trematodi ectoparassiti di pesci marini. 

 (Phylline monticellii e Placunella vallei). Atti Soc. Ligust. Sci. 

 Nat. e Geogr., Genove, vol. 6, no. i, pp. 84-87, 2 figs., Alarch. 



