531 
bjntozoa of marine fishes. 
I 
front, 0.30 uim ; diameteY of body, anterior, 0.46 mm ; greatest diameter of 
body, 0.80 mm ; diameter bear posterior end, 0.24 rnm ; length of proboscis 
sheath, 4 lnm . \ 
In this specimen there are, about forty spiral series of hooks on the 
proboscis, twelve to fourteen hooks visible in a single spiral, and about 
twelve longitudinal rows visible on a side. These hooks are, for the 
most part, rather stout, sharply recurved and appressed, 0.05 mm in 
length near middle of proboscis, and 0.03 mm near the apex. On the 
dorsal side of the proboscis the hooks are smaller than they are on the 
ventral, and arcuate. There is a single circle of prominent arcuate 
hooks at the base of the proboscis, surrounding it somewhat like a 
spiny collar. These measure 0.08 mm in length. In front of the widest 
part of the body there are a few sagittate or triangular spines scat- 
tered rather sparsely over the surface. The length of th longest of 
these is about 0.08 mm , the breadth 0.04 mm . The proboscis a rhe alco- 
holic specimen is reflected nearly at right angles to the body and but 
slightly curved. The body is gently arcuate, with very numerous and 
uniform corrugations. The outline is linear, gently tapering poste 
riorly. The posterior end is oblique, narrowing abruptly, with the genital 
aperture about 0.016 mm from the end. The greatest breadth of the body 
is found about 2 mm back of the base of the proboscis. The neck is 
smooth, short, and conical. The length of the proboscis sheath in an 
alcoholic specimen was found to be over 5 mm . The lemnisci appear to 
be about the same length as the sheath. The ova measure 0.06 mm in 
length in alcoholic specimens. 
The specimens while living were faintly tinged with orange, and one 
of them had a bright yellow patch adhering like a cap to the posterior 
end. The maximum length of the alcoholic specimens is 20 mm . 
Habitat: Tylosurus caribbceus , intestine, Wood’s Holl, Massachusetts, 
July 27, 1886. 
Variety Tenuicornis. 
[Plate iv, figs. 39-41, and Plate v, figs. 42-53.] 
The specimens which I have referred to this variety are five males and 
one female from the rectum of Tylosurus caribbceus, and one female and 
one male from the intestines of Lobotes surinamensis. The variety is 
based on the character of the proboscis, which is provided with about 
half as many hooks as that of E. pristis. 
The following measurements were made on living specimens : 
Measurements. 
No. 1 
9 
© 
t-s 
No. 3 
d* 
Length 
mm. 
11. CO 
mm. 
7.40 
mm. 
1 10. 20 
Length ot proboscis 
1. 40 
1.40 
1.70 
Length of neck 
0. 20 
0. 24 
0. 10 
Diameter of body, anterior 
0.34 j 
0. 30 
0. 20 
Greatest diameter of bodv 
0.00 
0. 04 
0.57 
Diameter near posterior end 
0.20 
0. 28 
0.24 
Length of proboscis sheath 
2.20 
2. 00 
2. 60 
