TREMATODES FROM FISHES — LINTON 13 



10 mm.; length of sucker-bearing portion, 3 mm.; diameter of an- 

 terior sucker, 0.38 mm.; maximum diameter of body, 0.81 mm.; di- 

 ameter of one of the larger pair of suckers, 0.42 mm. ; one of posterior 

 terminal suckers, length 0.25 mm., breadth 0.14 mm. 



Type specimens. — Holotype, U.S.N.M. No. 8155; paratypes, No. 

 8412. 



Family DICLIDOPHORIDAE Fuhrmann, 1928 



Genus DICLIDOPHORA Diesing, 1850 



DICLIDOPHORA AFFINIS (Linton) 



Octoplectanum affine Linton, Proc. U. S. Nat. Mus., vol. 20, pp. 511, 512, pi. 



51, figs. 1-5, 1898. 

 Diclidophora affvnis (Linton), Bull. U. S. Fish Comm. for 1899, p. 482, 1901, 



Three specimens of this species (U.S.N.M. No. 8156) were collected 

 in the summer of 1905 from the mouth of the summer flounder 

 {Paralichthys dentatus) by Dr. J. F. McClendon. 



DICLIDOPHORA PINGUIS. new species 



Plate 15, Figures 197-199 



The trematodes here described were taken from the mouth of 

 Alhatrossia pectordlis in the northwest Pacific, June 7, 1906; U. S. 

 Bureau of Fisheries steamer Albatross, station 4781, depth 482 

 fathoms. 



Ten specimens were given to me by Willis H. Rich at the Bureau 

 of Fisheries Laboratory, Woods Hole, Mass., in the summer of 1925. 

 Measurements in alcohol : Length of body, 4 mm. ; of sucker-bearing 

 portion, about 3 mm. ; breadth at level of anterior suckers, 0.56 mm., 

 maximum, middle of body, 2.1 mm.; anterior suckers, length, 0.35 

 mm., breadth, 0.25 mm. ; pharynx, length, 0.46 mm., breadth, 0.42 mm. 

 In another specimen the breadth at level of anterior suckers was 0.45 

 mm.; anterior suckers, length, 0.28 mm., breadth, 0.21 mm.; phar- 

 ynx, length, 0.42 mm., breadth, 0.35 mm. Dimensions of a posterior 

 sucker in glycerin : Length of pedicel, 0.42 mm., diameter, 0.46 mm. ; 

 maximum diameter of sucker, 1.4 mm. 



The alcoholic specimens agree in having a short, narrow anterior 

 portion, which is sharply marked off from the body, necklike, nearly 

 cylindrical, tapering but slightly to the anterior end. The body proper 

 is stout and oblong-elliptical in outline. Sections show it to be very 

 muscular. It is doubtless capable of much elongation. The mouth 

 appears to be terminal; anterior suckers oval-elliptical; pharynx 

 relatively large, its anterior edge lying at the posterior edges of the 

 anterior suckers, its posterior end about on a level with the con- 



