TREMATODES FROM FISHES LINTON 33 



One (U.S.N.M. No. 8179), collected September 4, 1911, from 

 goggler; 7 fishes examined. Measurements in balsam, compressed: 

 Length, 1.4 mm.; breadth, 0.56 mm.; ova, 0.015 by 0.009 mm. The 

 anatomy is concealed by the enormous number of ova. 



Genus NANNOENTERUM Ozaki, 1924 



NANNOENTERUM BACULUM (Linton) 



Plate IS, Figukes 250, 251 ; Plate 19, Figures 252, 253 



Gasferostomum sp. Linton, Bull. U. S. Fish Comm. for 1899, p. 447, figs. 369- 



372, 1901. 

 Oasterostomnm haruhim Linton, Bull. U. S. Bur. Fish., vol. 24, p. 362, figs. 



233, 234, 1905. 

 Bucephalus baculum (Linton), Nicoll, Journ. Marine Biol. Assoc. United 



Kingdom, ,to1. 10, p. 401, 1914. 

 Ncmnoenterum baculum (Linton), Mantes, Parasitology, vol. 23, p. 397, 1931. 



The material available when the original description of this species 

 was written, like much of the material hitherto referred by me to the 

 genus Gasterostomwm., was in poor condition, being more or less 

 macerated. It was not until subsequent examination of material was 

 made that the circle of tentacles surrounding the anterior sucker was 

 noted. 



Body nearly linear, covered with dense spines, which are minute, 

 flat, and scalelike in front view, but appear to be slender and bristle- 

 like in edge view, as along the margins of the body. Anterior sucker 

 relatively large, bluntly wedge-shaped ; in dorso ventral view anterior 

 end truncate, posterior end rounded; opening of sucker anterior and 

 ventral, surrounded by about 20 short tentacles. Kelative positions of 

 the genitalia subject to some variation, owing to greater or lesser 

 accumulation of ova in the uterus. Usually the ventral sucker is 

 about the middle of the length. The intestinal cecum extends pos- 

 teriorly, its walls made up of large cells. Testes near together, one 

 following the other, more or less oval-elliptical, longer than broad, 

 near middle of postacetabular region. Cirrus pouch extending to 

 about the middle of the second testis. Ovary in front of testes, on a 

 level with the posterior half of the intestinal cecum, smaller than 

 testes, subspherical. Ovary and testes on right side. Vitellaria lat- 

 eral, about 16 follicles on each side, in some cases nearly symmetrical, 

 in others extending farther anteriorly or posteriorly than the other. 

 Usually they extend from the level of the first testis to about the 

 middle of the preacetabular region. In some of the mounted spec- 

 imens there appear to be about 12 follicles on one side and 16 on the 

 other; in others about 15 follicles on each side; as many as 18 on a 

 side were noted. The folds of the uterus may extend from the 



3 55599—40 3 



