3(38 



BULLETIN OF THE BUREAU OF FISHERIES. 

 Pomatomus saltatrix, Blue-fish. 



All the blue-fish examined at Beaufort were small, but few of them reaching a length of more 

 titan s inches. 



ACANTHOCEPHALA. 



1. Echinorhynchus prixtis Rudolphi. 



1901.— Aug. 28, 1 female. 



NEMATODES. 



2. Immature nematodes (Ascaris sp. ). [Fig. 84.] 



1901. — Aug. 31, numerous, clustered cysts on viscera. Type with long diverticulum of oesophagus and 



short diverticulum of intestine — the most common form. Larger specimens with dark-brown intestine. 

 Some of the cysts Ailed with brown, waxy secretion. 



1902. — Aug. 11, cyst on viscera filled with tine granular material in which the very small worms 

 were embedded. 

 :!. Immature nematodes { Ascaris sp. ). 



1901. — Aug. 27, 28, severaj on each date. This form differs from Ni>. 2 in having no diverticulum 

 of the oesophagus, and the postanal region corrugated. Same form noted on other occasions in other 

 busts, but not of such frequent occurrence as the preceding. Same type as show rj in tig. 31. 



1. Ichthyonema globieeps Rudolphi. 



1902.— July 25, fragments; neither extremity was seen; intestine dark-brown. .Inly 28, many 

 fragments. Aug. 4, several fragments; Idled with the characteristic young, anterior end blunt, 

 posterior attenuated, length about 0.5 mm.; diameter 0.01 mm. These fragments were in poor con- 

 dition. They were from the alimentary canal where they bad evidently been affected by the digestive 

 juices of the fish. Aug. S, 2 females. 212 and 20 mm., respectively. Longer specimen with fully 

 developed young in the uterus which occupied the greater part of the body. The smaller specimen 

 with eggs in the uterus. These worms came from the stomach, color reddish, intestine, as in all, 

 dark-brown. Aug. 11, fragments. Aug. 22, numerous fragments. The broken condition was doubt- 

 less due to the fact that the intestines df the fish had been cut into small pieces to allow any small 

 distomes that might be in them to creep out into the water. Aug. 26, fragments, one blood-red. 



