PARASITES OF FISHES OF BEAUFORT, NORTH CAROLINA. 397 



20. Distomum sp. 



1902. — .July 21, 2. Dimensions, life, in millimeters. Length t >. 7S ; maximum breadth 0.5; diameter 



of oral sucker 0.09, of pharynx 0.05, of ventral sucker 0.07; ova 0.031 by 0.018. 



21. Distomum vitelloeum Linton. 



The distomes referred to this species are represented by a very great variety of shapes. 



1901. — July 30, 1. This specimen is in almost exact agreement with IIlt. 336, pi. \.\x. Parasites of 



Fishes of W Is 1 lole Region, U. S. Fish Commission Bulletin for 1899. Yellowish, body covered with 



fine, transverse wrinkles, characteristic fimbriae around the ventral sucker; length 1 mm. Aug. 5, 1. 

 Aug. 17. few. Aug. 24, 3. Aug. 31, 1. It should be noted that as individuals begin to macerate, or 

 even before that, the characteristic lobes or fimbria' around the ventral sucker disappear. 



See remarks on this species under Meniicirrhus. 



1902. — July 7, few. July 17,3. July 18, several, some transparent, cylindrical, rigid, with promi- 

 nent ventral sucker, one yellowish, flattened, oval. July 31, 2; 1, length 3.15 mm., remarkable for 

 the elongated posterior region, which was flat and leaf-like, fimbria' around the ventral sucker promi- 

 nent. Aug. II, few. An-;. 10, 12. Aug. 18, 2. Aug. 10 and 20, few on each date. 



22. Distomum simplex Rudolphi. 



In this species the testes are lobed, tin- body elongated, and there are no lobes around the ventral 

 slicker. 



1902. — July IS, 1. July 21. 2. July 22, I. Dimensions of one, life, in millimeters: Length 4; 

 diameter, anterior 0.21; at ventral sucker 0.5, middle (maximum) 0.0, near posterior end 0.43; 

 diameter of anterior smker 0.18, of ventral sucker 0.3; pharynx, length 0.11, breadth 0. 00; ova 0.07 

 by 0.04. 



23. Distomum bothryophoron Olsson. 



1002. — July 21, 1, oval, tapering anteriorly. Dimensions, life, compressed, in millimeters: Length 

 1.2; maximum breadth 0.55; diameter of oral sucker 0. 10, of pharynx 0.05, of ventral sucker 0.2; ova 

 0.018 by 0.014. 



24. Aspidogaster ringens sp. nov. [Figs. 243-240.] 

 See No. 11 under Tntchinotwt carolinus. 



Usually convex dorsally and concave ventrally. Body proper elongate, tapering at both ends 

 and usually projecting beyond the ventral sucker at each end, but subject to some variation I figs. 244, 

 245); posterior end conical-pointed. Neck cylindrical, head slightly expanded and divided by a lat- 

 eral cleft into a three-lobed dorsal and a two-lobed ventral lip. Head and neck often completely 

 retracted. Ventral sucker elliptical, with numerous marginal loculi and marginal sense organs. 

 Thirty-six marginal loculi were found in the specimen sketched in fig. 246. In the same specimen, 

 which was in good condition, there were "17 larger transverse median loculi, with a median ridge not 

 strongly developed, hut quite distinct. The ventral sucker is thus divided into 4 longitudinal rows of 

 loculi, and is therefore of the Aspidogaster type. In sonic specimens all the loculi are very indistinct. 

 Dimensions of living specimen, in millimeters: Length 2.57: diameter of head 0.4; pharynx, length 

 0.16, breadth 0.14; ventral sucker, length 1.01, breadth 1.1; ova 0.103 and 0.058 in the two principal 

 diameters. 



Color variable; in general brownish red with anterior end whitish, border of ventral sucker 

 slightly yellowish or translucent. A not infrequent color effect is amber yellow above, purplish red 

 below. 



The testis is single, median, usually not far from the middle of the length of the body, but some- 

 nine- crowded back to near the posterior end of the conical tail by the voluminous folds of the uterus, 

 which are filled with comparatively largeovaand occupy the dorsal and posterior portionsof the body. 

 The ovary lies in front of the testis. The vitcllaria consist of two elongated lateral masses. The 

 voluminous vas deferens and muscular copulatory organ lie well forward near the anterior margin of 

 the ventral sucker. The genital aperture is on the left side of the neck. 



The placing of these specimens in the nenus Aspidogaster is provisional, since they possess charac- 

 ters which point with almost equal distinctness to Cotylaspis and Cotylogaster. In a revision of the 

 Aspidohothridx it will doubtless be found to be necessary either to emend the genus Aspidogaster or to 

 erect a new genus to accommodate this species. 



1901.— Aug. 20, 2. Aug. 31, 3. 



1902.— July 17, 1. July 22, 2. July 31, :;. Aug. 11, 1. Aug. 10, 1. Aug. is. :;. 



