PARASITES <>F FISHES OF BEAUFORT, NORTH CAROLINA. 

 Centropristes striatus, Black Sea-bass. 



375 



All the fish were rather small, many of them from 4 to 5 inches in length. 



In 1902, from July 7 to August 19, 45 tish, all small, were examined. The contents of the 

 alimentary canals comprised fish, crabs, shrimp, amphipods, and other small Crustacea, anneliils, 1 

 ophiuran, and sea lettuce. 



NEMATODES. 



1. Immature nematodes [Ascaris). [Fig. 33.] 



Type with diverticula to intestine and oesophagus. 



1901. — Aug. 2, rather numerous, small on viscera. Aug. .'!, 7, 12, 13, 16, 22, and 27, few on each date. 



1902.— July 8, few; July 17, 1; July 19, 3; July 21, 1; July 22, several. A leu, noted on July 14, 

 lii, 22, which differed from the others in having a more distinctly clavate oesophagus; the subcuticular 

 layer was conspicuously cellular. 



2. Immature nematodes (Ascaris). 



Type with elongated basal part of o-sophagus and corrugated post-anal region. 

 1902.— July 29, few. 



CESTODES. 



.'!. Scolex polymorphous Rudolphi. 



1vi02. — July 25; elongated forms with 2 costse on bothria and 2 red pigment patches on the neck. 



4. Rhynchobothrium sp. 



Probably larval stage of /.'. jilii-ntnm sp. now 



1902. — July 16, 1. This specimen was found free in the water of a small dish in which the viscera 

 had been lying. It had doubtless escaped from a cyst. The specimen was very active. The 

 proboscides were not seen extended, but the hooks, seen through the body wall, suggest this species. 

 Length 2.5 mm.; length of head and neck 0.8 mm. 



5. Rhynchobothrium sp. [Fig. 94.] 



Probably encysted stage of /,'. longwpine Linton. 



Small, oval, or pyriform cysts in viscera and mesentery; larva? small, with relatively long con- 

 tractile bulbs, and with hooks of various sizes, but some of them relatively rather large. Length of 

 longer hooks 0.027 mm. 



Same form recorded from various hosts in these notes, Aug. 5, 



1902.— July 17, 21, 25, 29, and Aug. 12, 19; few to numerous, 

 had no trace of larva in the blastocyst. 



6. Rhynchobothrium sp. 



1901. — Aug. 10, 1 larva from small cyst on viscera noted which belongs to a type found in other 

 hosts; characterized by elongated neck and proboscides armed with minute hooks. Probably A'. 

 tenuispine Linton. 



1902.— July 16, 1; Aug. 15, 1. 



7. Otobothrium dipsacum Linton. 



1901. — Aug. 12, a single specimen from a blastocyst on the viscera. 



8. Cestode larva. 



Apparently a larval Dibothrium. 

 1902. — July 19, 1, encysted on viscera, 



7, 8, 10, 12, 13, 17, 22, 27, 1901. 

 S cysts were opened which 



