PARASITES OF FISHES OF BEAUFORT, NORTH CAROLINA. 399 



6. Rhynchobothriutn sp. 



1901. — Aug. 24, 1, a larva, not mature enough tc> admit of identification. It was obtained from a 

 very long blastocyst from the ovary of its host. Length of blastocyst 180 mm., average diameter 2 

 mm. July 29, elongated blastocysts on viscera. Larva from onenot far enough developed to allow 

 even generic determination. 



7. Tetrachynchus bistdcatus Linton. 



1901.— July 29, scolex from cyst in stomach wall, under serous coat. Other cysts were opened, but 

 no entozoa found. One liberated a yellow mass, which appeared to be a degenerate blastocyst. The 

 interior was semifluid, with irregular masses of carbonate of lime, scattered through it. The same 

 condition existed in a cluster of cysts on the mesentery. The presence of carbonate of lime in these 

 cvsts was shown by the brisk effervescence in dilute hydrochloric acid. In some cases the calcareous 

 material, instead of being scattered through a fluid in granules, was aggregated into a mass which tilled 

 the greater part of the cyst. ( >ther scolices obtained from another fish examined later on this same 

 date. July 30, scolices from cysts in stomach wall. July 31, few. Aug. t>, few. 



1902.— July 18, 23, 25, Aug. 1, 15, few on each date; cysts in stomach wall. 



TREMATODES. 



s. Dislomum monticeltii Linton (?). 



1901.— July 30, 1, incomplete specimen closely agreeing with this species. Oral sucker 0.10 mm., 

 ventral sucker 0.32 mm.; ova 24 by 14 microns. July 31, 3, pale orange; ventral sucker more than 

 three times diameter of oral; ova 27 by 14 microns, cirrus spinose, one of the vitellaria distinctly 

 three-lobed, but not situated far back of ventral sucker. Aug. 6, 3 small distomes, which agree with 

 this species in proportions and character of vitellaria, but the ova are smaller than in any appen- 

 diculate I have hitherto seen. This latter feature is true also of a large distome which was associated 

 with these (see No. 9, below)- Dimensions in millimeters: Length 2.8; diameter of oral sucker 0.11, 

 ventral sucker 0.46; ova 0.014 and 0.010 in the two principal diameters. 

 '.i. Distomum tornatum Rudolphi. [Fig. 156.] 



1901. —Aug. 6, 1; vitellaria tubular. Dimensions, in millimeters: Length 10, breadth 2: transverse 

 diameter of oral sucker 0.32, of ventral sucker 0.84; ova 0.015 and 0.010 in the two principal diameters. 

 See No. 8, above. 

 10. Distomum uitellosum Linton. 



1901.— July 29, numerous; of great variety of size and shape, e. g., length 1.12, breadth 0.4; and 

 length 3.6. The ova do not vary much from 60 by 40 microns in the two principal diameters. Fim- 

 briated borders of ventral sucker very prominent. When placed in fresh water these distomes become 

 rigid, the body cylindrical, and the neck reflected until it stands nearly at right angle- to the body. 

 The neck, even in the larger specimens, is always very short. Fifty or more were obtained from a 

 third fish which was examined later on this date. Most of these were elongated, 5 mm. and more 

 in length, with prominent ventral sucker and reflected neck. The distomes in this lot were rather 

 delicate and fragile. There were a very considerable variety of shapes. Indeed, if they were not seen 

 in such large numbers together they might very easily help to increase the confusion which exists at 

 the present time in the classification of the distomes. July 30, large numbers and great variety of size 

 and shape. July 31, few, large ( 4.25 mm.) and fragile. Aug. 1. numerous. Aug. 6, numerous, very 

 variable in shape and size, most of them somewhat macerated. Aug. 20, 150 from one host. Aug. 

 24, numerous. 



1902.— July 18, 23, 25, Aug. 1, 15, 20, usually numerous and of diverse shapes. 



Dimensions, in millimeters: Length 1.12; diameter 0.15; another, length 3.92, diameter 0.4. A 

 leading character of this species is the presence of a number of short lobes surrounding the ventral 

 sucker, often very prominent, but in certain stages of contraction to be made out only with great dif- 

 ficulty. In specimens which are not in good condition these lobes can not be made out at all. 

 Indeed, they were not noticed in the specimens upon which the original description of the species was 

 based. The longer specimens owe their greater length principally to the extension of the body, and 

 not to the neck, which remains short. (Esophagus distinct and of moderate length. 

 11. lint, .nun, i tenue Linton. 



1901. — July 29, 3 or more; length of one l.ti-J mm.: ova 93 by 52 microns. 



