388 BULLETIN OF THE BUREAU OF FISHERIES. 



7. Rhynchobothrium sp. 



Type characterized by slender larva, long neck, exceedingly minute hooks, from fusiform cysta 

 on viscera. R. lenuispine Linton is suggested. 

 1902.— Aug. 12, 1. 



8. Rhynchobothrium sp. [Fig. 93.] 



1901. — Aug. 10, numerous on viscera in pyrifonn cysts. This is the type seen in many hosts, 

 and characterized in these notes as small, with relatively long hooks. The larva is short, and the 

 hooks are of various sizes and shapes. The larger hunks are relatively long when compared with the 

 size of the larva. A similar remark may lie made respecting the contractile bulbs. Dimensions of a 

 living larva, in millimeters: Length 1.54; length of head 0.S5, of contractile bulbs 0.5, of longer hooks 

 0.04. Both this species and the following | No. 9 i were found in the Mack has- i Centropristes striatus) 

 on the same date. Both hosts were taken at the jetty near lout Macon. Their food habits are prac- 

 tically identical. Aug. 12, cysts on viscera; one of these was examined and the contained larva 

 appeared to he a very immature stage of this species. 



1902.— July 25, several. July 29, few. 



9. Rhynchobothrium sp. [Fig. 97. Sit also tig. us.] 



1901. — Aug. 10, cysts on viscera. These contain relatively elongated larva.-. A type found in 

 other hosts, hut not of such frequent occurrence as No. 8. Sec under ( 'enlropristes. The neck is long, 

 the proboscis sheathes in a close spiral in ordinary conditions of contraction; proboscides rather long, 

 the hooks relatively short and close together. Dimensions of a living larva, compressed, in milli- 

 meters: Length 3.85; length of head 0.46, of contractile bulbs 0.43, of longest hooks 0.014. 



1902. — Aug. 19, from fusiform cyst on viscera, the hooks suggest /,'. plicatum, similar to specimen 

 from Orthopristis chrysurus collected Aug. 20. 



10. Otobothrium crenacolle Linton. 



1901. — Aug. 12. small cysts from viscera in which were blastocysts containing larv.e. These were 

 rudimentary but appeared to belong to this species. Aug. 15, 2 larvse from cysts in body cavity. 

 Such numbers as here given do not represent the actual number in the fishes examined on this date. 

 It may he added that in the majority of instances when- this species was found at all it was found in 

 comparatively large numbers. 



1902. — July 17, 19, Aug. s, encysted on viscera and mesentery. 



11. Tetrarhynchus bisulcatus Linton. 



1901. — Aug. 12, rather numerous, encysted in stomach wall. 



1902. — Aug. 13, numerous in stomach wall. Aug. 15, 1 encysted in stomach wall. Aug. 5, 11, 

 IS, 19, 21, few on each date: cysts in stomach wall. 



TKEMATODES. 



12. Dish, urn hi monlicellii Linton. 



1901. — Aug. 13, 1. In this specimen the testes are close behind the ventral sucker, where they are 

 perhaps crowded forward by the voluminous folds of the uterus, which are filled with ova. The 

 ovary is separated from the posterior testis by folds of the uterus, and is itself followed by the 

 vitellaria. The latter are lobed, having about three lobes on each side. The shell gland is at the 

 junction of the lobes of the vitellaria just back of the middle of the ovary. Cirrus pouch in front of 

 the ventral sucker, a little to the left; genital aperture on median line of the neck, just hack of origin 

 of intestinal rami. Dimensions of living specimens, compressed, in millimeters: Length (appendix 

 partly retracted) 3.2; maximum diameter 0.5; diameter of oral sucker 0.2, of ventral sucker 0.42, of 

 pharynx tins, ova 0.024 by 0.014. 



13. Dislomum mtellosum Linton. [Fig. 178.] 



1901. — Aug. 10, 2, lobes on the bonier of the ventral sucker very distinct. 



1902.— July 17, 2. July 20, Aug. 4, 8, 11, few on each date. Aug. 10, several. Aug. 21,2. 



As usual, the individuals present a great variety of shapes. 



In 1001 other small distomes were taken (fig. 170) which probably belong here, although the 

 characteristic lobes around the ventral sucker were not marie out. The posterior end is slightly 

 emarginate in all the preserved specimens and the aperture of the ventral sucker is narrow and 

 transverse. 



