ENTOZOA OF MARINE FISHES. 
529 
Length of one of larger hooks, 0.066 mm ; breadth at base, 0.026““ ; 
length of chitinous (?)‘sheath, 0.036 m,n ; breadth of same at outer extrem- 
ity, 0.027 mm ; length of ova, 0.097““ ; breadth 0.019““. 
Two lots of these Echinorhynchi were received, one containing 87 
and the other 4 specimens. The first lot was from the stomach and 
intestine, the second from peritoneum and ovaries of their host. 
Habitat : Roccus americanus , Long Island shore ; collected by Mr. S. 
E. Meek, Fulton Market, New York, October, 1886. 
Eciiinorhynchus ATTENUATUS sp. uov. 
[Plato in, iigs. 23 to 30. J 
The following account is based on a few alcoholic specimens given 
me by Dr. B. Sharp. They were obtained from the intestine of a stur- 
geon (Acipenser brevirostris ), Wood’s Holl, Massachusetts, July, 1889. 
The specimens were said to have been numerous in the host. As no 
color notes were recorded they were probably whitish or yellowish 
white, the color most common in the entozoa. The females are about 
25““, the males 12““ in length ; habit of body slender ; greatest diam- 
eter near anterior end, attenuate posteriorly, slightly so anteriorly ; 
frequently swollen on dorsal side at thickest place; body smooth, but 
sometimes with undulating outline, arising from a knotted appearance 
of the body; neck very short, conical; proboscis cylindrical, implanted 
somewhat obliquely; hooks of proboscis rather small and slender, 
deeply immersed in the tissues of the proboscis, strongly recurved, 
basal supports broad resembling those of E. acus but not so massive; 
about fourteen spiral series of hooks, ten or twelve visible on a side ; 
lemnisci not seen satisfactorily, but apparently slender and a very little 
longer than the proboscis sheath ; testes long, elliptical, distant from 
each other about the length of one, and the same from the anterior ot 
the prostate glands. The latter are six in number, making a moniliform 
chain much as in E. acus . Copulatory bursa not seen extended but evi- 
dent in specimens made transparent. 
The dimensions of a female specimen were : Length, 20““; greatest 
breadth, 1.75““; breadth at anterior end, 0.6““; at posterior end, 0.5““; 
length of proboscis, 0.8““; diameter, 0.32““; length of neck, 0.16““; 
length of sheath, 1.5“™. The maximum length of the specimens sub- 
mitted to me was 32““. 
The character of the hooks is shown in the sketches appended to this 
report. 
Longitudinal sections through the tumid anterior portiou of one of 
these Echinorhynchi show that the space occupied elsewhere by the 
subcutaneous vascular layer of the body wall is here enlarged into a 
cavity filled by a*fine granular homogeneous substance. The nerve gau- 
glion is situated a little in front of the middle of the proboscis sheath. 
H. Mis. 274 34 
