[cooper] TREMATODES FROM MARINE FISHES 189 



will be seen that these individuals approach more nearly Looss' 

 description of the species than Lander's (8), although both were 

 naturally quite young. Moreover, the structure of the vitelline 

 glands, shown in Figs. 9A, B and C, confirm this statement. Whereas 

 those of Lander's crenatus, that renamed B. affinis sp. nov. by Looss' 

 are almost entire in outline, those of these specimens are, as in 

 Looss's crenatus, deeply indented, the indentations being well seen in 

 sections and passing into the substance of the gland for some distance. 

 In the larger, broken specimen the right gland is deeply trilobed while 

 the left (in sections) shows only very slight indications of a bilobation ; 

 in the other, as indicated in the figures, the right, viewed from the 

 right side, is four-lobed while the left shows only three main lobes. 

 Either gland may appear, when seen obliquely from the opposite side, 

 almost entire, a fact noted by Looss under his remarks on B. affinis. 

 A further point of interest in connection with the determination of this 

 species is that, although no specimens were found free in the stomach 

 or intestines of the Salmon, it is quite possible that Clupea harengus 

 is one of the intermediate hosts, if not the only one, and that a further 

 search would show that here on the Atlantic Coast we might find 

 B. crenatus in the same host as in Europe, viz., Salmo salar. Apart 

 from these remarks I do not presume to discuss the validity of Looss' 

 new (American) species, since only two young specimens are at hand. 



12. Stenocollum fragile (Linton). 10, p. 295. 



Pyloric coeca of Gadus callarias L., Cod. 



A few small trematodes, poorly preserved, and broken during the 

 clearing processes, are doubtfully referred to this species, since, apart 

 from the fact that they are quite depressed or ligulate throughout their 

 length and that the neck, as far back as the acetabulum, is covered 

 with extremely minute scales, arranged in two sets of diagonal rows 

 crossing each other at right angles, they agree fairly closely with 

 Linton's description (loc. cit.). 



13. Tocotrema lingua (Creplin). 13. 



Encysted on the gills of Hemitripterus americanus (Gmelin), 

 Sea- Raven. 



The following measurements, of the only intact specimen at hand, 

 mounted as a transparent preparation, compare favorably with those 

 of Linton's "No. 3" (10, p. 296): Length, 0-447; maximum breadth, 

 0-172; breadth of anterior sucker, 0-042; length of pharynx, 0-028, 

 breadth, 0-017; breadth of "acetabulum" (genital sucker), 0-028. 

 The somewhat flattened, spheroidal cysts were found in fairly 

 large numbers, firmly attached to the smaller bony supports 

 of the gill-filaments. Each cyst is, as noted by Linton, covered 

 with dense black pigment which in larger specimens tends to 



