758 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [40] 



gated and slender, the bothria surmounting them as flattened or col- 

 lapsed disks. No perceptible difference could be noticed in these speci- 

 mens while they were in sea- water. When placed under the compres- 

 sor, one of them became somewhat attenuated as shown in the sketch 

 (Plate IV, Fig. 1). 



No. 2 of the above table was probably the specimen which was kept 

 for some time under the compressor in order to obtain a sketch, and when 

 transferred to the killing fluid, its tissues still retained the position they 

 wereforced to assume under the compressor. The bothriain this alcoholic 

 specimen are irregular patellate, mounted on long slender pedicels, and the 

 first segments are very slender, nearly twice as long as broad. The 

 laciniae are slender pointed and have a tendency to stand out at right 

 angles to the axis of the strobile. In the other alcoholic specimen, No. 

 3, of the above table, the bothria, although somewhat distorted, have 

 not changed their shape materially from that shown in Fig. 12, of Plate 

 in, sketched from a specimen lying free in sea- water. The bothria are 

 trumpet shaped, pedicels narrow at base but not elongated. The ante- 

 rior segments are crowded, three or four times as broad as long, with 

 slender sharp pointed lacing. The posterior segments in all the speci- 

 mens are, in the main, alike. 



The bothria in two of the specimens in this lot show a peculiar kind 

 of modification, resulting from contraction, which, if but a single 

 specimen were found and so modified, might prove misleading to the 

 identifier. In these, when viewed in certain positions, each bothrium 

 appears to be divided almost completely into two loculi, by a transverse 

 constriction. A careful study of this peculiar distortion reveals the 

 fact that the margin of the bothrium is still entire and the appearance 

 of a constriction is caused by a protrusion of a part of the thin tissue 

 which makes the bottom of the hollow face of a bothrium. The latter 

 is transparent, and the thick, muscular, marginal rim of the bothrium 

 showing through it accounts for the deceptive appearance of two lo- 

 culi on the face of the bothrium. This same phenomenon was noticed 

 in specimens belonging to the second lot. (See Plate IV, Fig. 2.) 



Anatomy of posterior segment. — In one of the posterior segments 

 from a specimen belongiug to lot 3, the marginal genital aper- 

 ture was .G mm from the front end. This segment was 1.8 mm in length 

 and was .4 mm in breadth at the front end, .62 mm at the middle, and .5 mm 

 at the posterior end. The ovaries are roundish, somewhat reniform 

 bodies at the posterior end of the segment, lying one on each side of 

 the median line. They are about .36 mm in length and ,24 mm in breadth. 



The cirrus, which appears to be smooth, was retracted in all cases. 

 Its bulb is pyriform, at right angles to the axis of the segment, the 

 larger end within. It is .26 mm long and .16 mm broad at widest part. 

 The vagina was traced in a gently sinuous course along the median 

 line from the posterior end of the segment, at a point between the 

 ovaries, to the cirrus bulb. It bends around the base and anterior side 



