[65] NOTES ON ENTOZOA OF MARINE FISHES. 783 



lu the two remaining specimens (var. ft) there is a decided notch on 

 the edge of the apical disk. This notch is opposite a lateral face of the 

 strobile. In one of the specimens the sides of the disk which are oppo- 

 site the margins of the strobile are appressed. The apical ridge thus 

 formed was concave in front, so that the disk was shaped like a saddle. 

 In this case the notch was at one end of the apical ridge. In the other 

 specimen the sides of the disk which are opposite the lateral faces of 

 the strobile are appressed. The notch in this latter case is on one of 

 the appressed sides of the disk. The disk in var. ft is both relatively 

 and absolutely larger than those of var. a. 



With the exception of a tendency to appress the edges of the disk, 

 which movement was accomplished slowly, no motions, either locomo- 

 tile or those of dilatation or contraction, were observed in the disks of 

 the living specimens. 



Immediately behind the broad disk there is a constriction which in 

 the living worm is marked by a narrow orange-colored baud. Behind 

 this the neck expands into a globular mass, yellowish in color and with 

 a corrugated or fluffy surface. It is much smaller than the anterior 

 disk, and appears to be made up of a number of inflated folds. This part 

 was not observed to change its shape during life; its surface remained 

 pretty uniformly corrugated. The alcoholic specimens show some ir- 

 regularity, in that some of the inflated folds are much larger than 

 others. 



There was no indication of either bothria or auxiliary acetabula on 

 either the disk or the cervical mass, although the latter, as a whole, 

 much resembled the head of a Phyllobothrium in a highly contracted 

 condition. 



The body in the adult specimen (var. ), immediately after emerging 

 from the cervical mass, increases slightly in breadth, although still 

 quite narrow. Transverse strife begin a short distance back of the 

 head. The anterior segments are closely crowded together and several 

 times as broad as long. The median segments are rectangular and three 

 times as long as broad. The posterior segments are irregularly squar- 

 ish. In the living worm the posterior segments change their shape so 

 incessantly that it is difficult to make measurements. The strobile is 

 flat and increases in breadth regularly from immediately behind the 

 head to the first mature segments, from which point the breadth some- 

 what decreases. The mature segments are squarish, usually broader 

 than long, but quite variable. Near the posterior end there is a tendency 

 towards elongation, so that some segments occur which are longer than 

 broad; others are elongated posteriorly, the posterior end becoming 

 appressed and narrower than the anterior. 



The posterior end of the mature segments are, in alcohol, dark colored 

 on account of the ova. There is also a longitudinal dehiscent opening 

 along the median line. 



The aperture of the male genital organ is easily seen to be marginal, 



