298 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
poucli which has a triangular outline, when seen in lateral view, immediately in front of and dorsal 
to the ovary; testes two, snhglobular, the posterior one about midway between the ventral sucker, 
the anterior midway between the posterior testis and the ventral sucker. The ovary is slightly 
smaller than the anterior testis and lies in front, of it and approximate. The cirrus lies ventral ly 
at the posterior end. It lias very thick walls and extends anteriorly to the posterior testis. The 
vitellaria consist of about 32 conspicuous globular, yellowish-brown masses, which lie for the most 
part anterior to the ventral sucker. In a specimen which was compressed lightly and viewed from 
the dorsal side these bodies lay in an irregular double lateral line, 16 on each side. About three of 
these lateral masses were posterior to the ventral sucker. The remainder extended forward to a 
point nearly midway between the anterior and the ventral sucker. The folds of the uterus are very 
voluminous, filliug the posterior part of the body and hiding the other organs as far forward as first 
testis. Ova very numerous, small, size somewhat variable, but average about 0.021 mm. and 0.014 mm. 
for the two principal diameters. 
The following measurements, in millimeters, were obtained from a living specimen: Length, 
1. 28; diameter anterior sucker, 0.09 ; diameter at anterior end, 0.01 ; median diameter, 0.21 ; diameter 
at posterior end, 0.14. In a mounted specimen measuring 2.7 mm. in length, the diameter of the 
anterior sucker was 0.1, tho diameter of the ventral sucker was 0.07. In this specimen the ventral 
sucker was 1.3 mm. from the anterior end, and tho length of tin: cirrus was 0.7 mm. A spacious, 
thin-walled vessel lies in the anterior part of the body, terminating blindly a short distance back of 
the anterior sucker, which I take to belong to the excretory system. 
Gasterostomum sp. 
[Plate 41, fig. 91, U. S. N. M. No. G525.] 
A single specimen from the gar-fish ( Ti/losurns marinus), August 27, is here mentioned. The body 
is so lull of ova that details of the anatomy can not be made out satisfactorily. The body is ovate; 
tapering uniformly from about the middle to each extremity. 
The following dimensions are given in millimeters: 
(1) In sea water: Length 0.85; diameter, anterior, 0.14; greatest diameter, near middle, 0.43; 
diameter, posterior, 0.17. 
(2) Specimen mounted in balsam, length, 0.92; greatesr diameter, 0.5; length of acetabulum, 
side view, 0.25; length of aperture of same, 0.1; diameter of oral, i. e., ventral sucker, 0.076; depth 
of same, 0.104; longer diameter of ova, 0.017 ; shorter diameter of ova, 0.01. 
The vitellaria, seen from the side, form a cluster of subglobular bodies placed dorsallv on a level 
with tho space between the acetabulum and mouth. The cirrus and cirrus-pouch are median in posi- 
tion, extending from near the middle of tho body to the posterior end. Testes and ovary could not 
be seen distinctly on account of the voluminous uterus crowded with ova; so far as could he made 
out, they appear to lie on the right side, having about tho same position as in G. ovation. 
Calyptrobothrium occidentale sp. nov. 
[Plate 41, figs. 92-97, TT. S. N. M. No. G520.] 
One large and six small cestodes from the intestine of the torpedo ( Tetranaree occidentalis) July 
25, and two small specimens from the same host on July 26, are here included. 
The gen u s Ca lyptro hoi hri win was erected by Monti cell i ( C. riggii, Naturalista Siciliano, An. xii, 
1893, p. 15, pi. i, figs. 1-4) to accommodate a species found in Torpedo marmoraia. 
At the time of collecting I thought that the small specimens on the one hand and tho large spec- 
imen on the other belonged to distinct species. After a careful comparison, however, I am led to 
the belief that they belong to the same species. 
Synopsis of species: Head truncate, botliriafour, in lateral pairs. Anterior end of bothria with 
horseshoe-shaped sucker, posterior end auriculate; bothria prominent and retractile, or partly so, 
in small specimens, nearly sessile in large specimens on account of thickening of axial part of head; 
posterior part of head continuing into a subcylindrical neck, which is about as long as the head 
proper in the large specimen, but over three times as long in the small specimens. First segments 
remote from the head very short; strobile linear; posterior segments rectilinear (ripe segments not 
seen); reproductive cloaca: on lateral margins about middle of length of segments. 
