PARASITES OF FISHES OF BEAUFOKT, NORTH CAROLINA. 367 



9. Distomum sp. [Fig. 204.] 



1901. — Aug. 28, 1. This is a very remarkable form, if tin- specimen is entire. Following are my 

 notes made at tin' time of collecting: 



Ventral sucker near posterior end, as if the neck ami body in a form like the appendiculate dis- 

 lome V.ttinuittiin had been interchanged. Surface slightly nodular, length 5.5mm.; distance of center 

 of ventral sucker from anterior end 4 mm., from posterior end 1.5 mm. 



( (titer dimensions, life, in millimeters: Breadth at middle of neck 0.88, behind ventral sucker 0.61; 

 oral sucker, length 0.4, breadth 0.5; pharynx, length 0.21, breadth 0.21; ventral sinker, length and 

 breadth each 1. Posterior end tapering and truncate. 



Specimen too opaque to show anatomy. It looked as it' it had been broken behind the ventral 

 sucker, but when examined with the aid of the microscope then- was no indication of any break. 

 Subsequent examination of longitudinal sections revealed the following anatomical features: The 

 pharynx is adjacent to the posterior edge of the oral sucker. There is no oesophagus. The intestinal 

 rami extend to the posterior end of the body. The ovary is lobed and lies at the extreme posterior 

 end of the body, where it is immediately preceded by the testes, which are two in number, median, and 

 close together. The uterus is voluminous and lies for the most of its length in front of the ventral sucker. 

 The genital aperture is about median and close behind the pharynx. The cirrus is surrounded by a 

 rather large prostate and the vas deferens lies in many folds posterior to it, but not inclosed in the 

 cirrus pouch. The vitellaria appear as clustered granules, mainly peripheral from the testes to near 

 the anterior end. Ova numerous, with thin shells 0.027 by 0.014 mm. in the two principal diameters. 



10. Mbnoslomum sp. [Figs. 226-229.] 



1901. — Aug. 28, numerous small ovoid or elongated forms. Most of these worms were elongated 

 anteriorly, very delicate and fragile. When highly magnified the body is seen to be crossed by 

 exceedingly minute transverse lines, becoming a little coarser toward the posterior, where the outline 

 is finely serrate. - Posterior half of the body filled with eggs. 



Dimensions of living uncontracted specimen, in millimeters: Length, 1.5; greatest breadth. 0.4"); 

 diameter of oral sucker, 0.075; of pharynx, 0.034; ova, 0.028 and 0.017 in the two principal diameters. 

 Each ovum bears a I i lament of about the same length as the body of the ovum. A contracted specimen 

 measuring 0.87 mm. in length yielded about the same measurements of other parts as the uncontracted 

 specimen — i. e., oral sucker, 0.09; pharynx, length. 0.048; breadth, 0.034. The difference in length 

 is made mainly by the contraction or elongation of the neck. 



1901.— Aug. 30, 1. 



11. Aspidogaster ringens sp. nov. (See Xo. 24, under Micropogon vmdukdus.) [Figs. 243-249.] 



1901. — Aug. 28, many. There is a considerable variety of coloration in these worms. Some are 

 orange, darker on back, pinkish below-, pale posteriorly. Ventral sucker with pale border and pink- 

 center in some; in others pale throughout; in others orange. General color effect reddish-brown. 



The ventral sucker is thick and fleshy and has many loculi. The head appeared to be expanded 

 into four short leaf-like lobes. Dimensions of a specimen lying in sea water, somewhat contracted: 

 Length, 2 mm.; breadth, 0.8 mm.; thickness, 0.7 mm. The favorite attitude seems to be with the 

 back convex and the ventral surface concave. Some are doubled on themselves ventrally. None were 

 seen in active motion. 



1901. — Aug. 30, 19. A mounted specimen from this lot has two lobe- on the ventral border of the 

 mouth and three on the dorsal, as shown in figures of specimens from the croaker. 



