ENTOZOA OF MARINE FISHES. 
527 
color. Specimens transferred from fresh water to Pereuyi’s fluid suf- 
fered no change except to assuineabluish-white color. A plump specimen 
transferred from sea water to Perenyfs fluid showed no change except 
loss of color. A flat, thin specimen, 35 n,ra in length, transferred from 
sea water to 50 per cent, alcohol, shrunk to 19 m,n , became plump, rugose, 
lost color slowly. Aflat, thin specimen, 25 ,nm in length, transferred from 
sea water to chromic acid £ per cent., changed its shape very slowly, and 
was rather active and uneasy for some time; in 15 minutes it had con- 
tracted to about 20 mm . A specimen 30 mm in length, transferred from 
fresh water to chromic acid | per cent., suffered scarcely any change. 
It can be seen very easily from the foregoing that alcoholic speci- 
mens vary in their proportions according to the manner in which they 
have been preserved. 
Some observations were made, by means of transverse and longi- 
tudinal sections, on the structure of the body wall of this species. It 
is not within the purpose of these notes, however, to enter into a dis- 
cussion of the details of structure. The few sketches which I have 
appended, with their accompanying explanations, will give a good gen- 
eral idea of the arrangement of the various layers of the body wall. 
Saefftigen’s excellent paper ( Zur Organisation der Echinorhynchen)* 
leaves nothing to be added to a knowledge of the organization of the 
Echinorhynchi, except after the most painstaking aud exhaustive ana- 
tomical research. 
In addition to the foregoing specimens, all of which were obtained 
from the alimentary canal of their respective hosts, I have, on two dif- 
ferent occasions, met with young Echinorhynchi in the body cavity of 
the scup (Stenotomus chrysops ), which appear to be the young of E. acus. 
On August 30, 1887, eight scup were examined; the only parasites 
found were two small Oestod cysts and a single male Echiuorhynchus, 
all in the peritoneum. The Echinorhynchus, although found in the 
body cavity instead of in the alimentary tract, and smaller than mature 
forms, is not immature in structure. The genitalia are perfectly devel- 
oped. Each testis is about 0.7 mm long and 0.26 mm broad. The prostate 
glands, seminal vesicle, etc., make a moniliform chain of six bodies as 
in the adult E. acus . The bursa was inverted but became quite evi- 
dent when the specimen was placed in glycerine. The shape of the 
proboscis and the shape and disposition of the hooks agree with E . acus. 
The hooks are, however, nearly one-third smaller. The neck is short, 
conical, aud unarmed ; the body transversely roughened with irregular 
folds; proboscis slightly inclined to one side; color translucent bluish 
white with reflected light, yellowish with transmitted light. The speci 
men became somewhat longer and more slender after it was placed in 
alcohol. Length in alcohol, 6 mm ; greatest diameter, 0.5 mm ; length of 
Morphol. Jahrb., 1884. 
