ENTOZOA OF MARINE FISHES. 
537 
which occur in the alimentary tract from those which are encysted or 
in the body cavity. The fact that the worm contains the characteristic 
fusiform embryos of the order points to but one conclusion, that if 
it was encysted it must have migrated from the alimentary tract to its 
place of lodgment. 
The specimen bears some resemblance to E. acus , but on account of 
the smaller number of hooks, the evident neck, and the outline of the 
anterior part of the body, I have decided to refer it to a new species. 
Habitat: Carcharias littoralis , Wood’s Holl, Massachusetts, August 
2, 1886. 
Echinorhyncuus proteus Westrnmb. 
[Plate vm, figs. 85 to 88.] 
U. S. F. C. Rept. 1886, pp. 496,497 ; plate vi, figs. 3 to 5. A. Sa»fftigen, Morpliol. 
Jalirb, 1884; plates in to v, anatomy. Carl Baltzer, Arch. f. Nat., 1880, i; 
plates i and n. 
Since the paper cited above was handed in for publication I have 
obtained this parasite on the following occasions. The host in each 
case was the striped bass ( Roccus lineatus) : 
No. 
Date. 
Number of 
fish examined. 
Number of Echi- 
norhynchi obtained. 
1 
A ug. 1 2, 1886 
Aug. 18, 1886 
Aug. 31, 1886 
July 13, 1887 
Aug. 18, 1887 
July 10, 1889 
Aug. 3,1889 
Aug. 14, 1889 
One 
One. 
2 
One. 
Three. 
3 
One. ...... 
Five. 
4 
One 
Three. 
5 
One 
Eight hundred. 
One. 
6 
One 
7 
Three... 
Numerous in each. 
8 
Seven 
Several in each. 
I have also had sent to me for identification by the U. S. Fish Com- 
mission two lots of E. proteus from R. lineatus , collected by Prof. S. E. 
Meek at Fulton Market, Hew York. The fish came Irom the coast of 
southern Hew England. 
On July 15, 1889, I examined the viscera of eighteen squeteague 
(Gynoscion regale ), in the intestine of one of which were two specimens 
of E. proteus. The heads were imbedded in the intestinal walls. The 
color of the body was a pale rusty yellow. 
These parasites were found in the rectum of their hosts. In the 
majority of instances they had penetrated the muscular walls of the 
intestine, and the proboscides, protruding into the body cavity, had 
become the nuclei of cysts covered with a connective tissue layer, over- 
laid by a fold of the peritoneum, and containing a yellowish-brown, 
waxy secretion. 
The adult of this form is readily recognized by its fusiform yellow or 
orange-colored body, slender filiform neck, surmounted by a thin, mem- 
branous bulla. 
