92 



PROCEEDINGS OF THE NATIONAL. MUSEUM 



VOU88 



to anterior, and more abruptly to posterior end. Wliile the seminal 

 vesicle, so far as it is shown in the mounted specimens, is in front 

 of the ventral sucker, in one specimen it appears to be somewhat 

 crumpled, elongated, in front and on the right dorsal side of the 

 ventral sucker, narrowing slightly until near the level of the anterior 

 border of the sucker, where it expands from a diameter of 0.03 mm. 

 into an enlarged portion 0.28 mm. in length and 0.13 mm. in diameter, 

 the anterior half of which is contiguous with the cirrus pouch. The 

 ovary appeared to be slightly lobed in one specimen, circular in 

 outline in at least one, and oval-elliptical, with the longer diameter 

 transverse, in one. 



Table 21. — Measurements of four specimens of Lepidapedon clavatum in halsam 



Measurement 



Length 



Maximum breadth 



Oral sucker, length 



Oral sucker, breadth 



Pharynx, length 



Pharynx, breadth 



Ventral sucker, length. . 

 Ventral sucker, breadth. 

 Ova 



Mm. 

 3.50 

 .81 

 .17 

 .28 

 .21 

 .21 

 .35 

 .35 



Mm. 

 3.25 

 .62 

 .17 

 .28 

 .21 

 .21 

 .38 

 .38 



Mm. 

 3.50 

 .84 

 .28 

 .27 

 .28 

 .28 

 .39 

 .42 



Mm. 

 3.78 

 .84 

 .31 

 .28 

 .28 

 .29 

 .37 

 .35 

 . 078 by 0.045 



From windowpane: One (U.S.N.M. No. 8283), collected August 

 17, 1908. Measurements in balsam: Length, 3.64 mm., breadth, 0.70 

 mm.; oral sucker, length, 0.28 mm., breadth, 0.35 mm.; pharynx, 

 length, 0.29 mm., breadth, 0.29 mm. ; ventral sucker, length, 0.47 mm., 

 breadth, 0.5 mm.; length of prepharynx, 0.28 mm.; ova, 0.075 by 

 0.045 mm. This specimen agrees closely with the distomes from 

 G eratacantlius schoeqyfl. The body is nearly linear, tapering to a 

 moderately blunt point at the posterior end; neck nearly linear. 

 Length of spines on neck about 0.015 mm. Seminal vesicle with a 

 few prostate cells at right margin of cirrus pouch; ovary slightly 

 lobed ; shell gland in front of ovary ; no seminal receptacle seen, but 

 some indication of sperm in early folds of uterus. 



LEPIDAPEDON ELONGATUM (Lebour) 



Plate 5, Figxjees 38-45 



Lepodora elongata Lebouk, Rep. (1907) Northumberland Sea Fisheries, pp. 20-21, 



1908. 

 Lepidapedon elongatum. (Lebonr), Mantee, Illinois Biol, Mon., vol. 10, No. 2, pp. 



85, 86, figs. 47, 48, 1926. 



Distomes from seven species of Woods Hole fishes, while present- 

 ing many diiferences in minor details of structure, are referred to 



