298 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



pouch which has a triangular outline, when seen in lateral view, immediately in front of and dorsal 

 to the ovary; testes two, snbglobular, 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 ventrallj 

 at the posterior end. It has very thick walls and extends anteriorly to the posterior testis. The 

 \itrllaria 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 

 tlie 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, tilling 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, 0.00; 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, the; diameter of the ventral sucker was 0.07. In this specimen the ventral 

 sucker was 1.3 mm. from the anterior end, and the length of the 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. 



[Plato 41, fig. 91, TJ. S. N. M. No. G52f>.] 



A single specimen from the gar-fish (Tyloxnrm marhma), August 27, is here mentioned. The body 

 is so full of ova that details of the anatomy can not be made out satisfactorily. The body is ovate? 

 tapering uniformly from abont 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; greatest, 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 vitcllaria, seen from the side, form a cluster of subglobular bodies placed dorsally on a level 

 with the space between the acetabulum and mouth. The cirrus and cirrus-pouch are median in posi- 

 tion, extending from near the middle of the 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 be made 

 out, they appear to lie on the right side, having about the same position as in <}. orntnm. 



Calyptrobothrium occidentale sp. nov. 



[Plate 41, figs. 92-97, IT. S. N. M. No. 6526.] 



One large and six small cestodes from the intestine of the torpedo (Tetranarcc. ore.} dent all ft) July 

 25, and two small specimens from the same host on July 26, are here included. 



The genus Calyptrotothrium was erected by Monticelli (C. riygii, Naturalista Siciliano, An. MI, 

 IX! (3, p. 15, pi. I, figs. 1-4) to accommodate a species found in Torpedo marmorata. 



At the time of collecting I thought that the small specimens on the one hand and the 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, bothria four, 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 subcylinclrical neck, which is about as long as the head 

 proper in the large, specimen, but over throe 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. 



