[89] NOTES ON ENTOZOA OF MARINE FISHES. 807 



part of the head, that part which was imbedded in the mucous mem- 

 brane, when removed appeared to be more delicate than the posterior 

 part. It was delicate and translucent, and of a faint pink or carnation 

 color. 



Behind the anterior tumid part of the head there was a constriction, 

 making the handle of the dumbbell. The band which formed this con- 

 striction was also pinkish in color. Behind this constriction was the 

 second tumid part of the head, which was dense and opaque and of an 

 ivory-white color. The color of the body was yellowish- white. 



The head preserved its singular shape unchanged when placed in sea 

 water, although the worm showed signs of life by very slow movements, 

 especially of the posterior segments. The worm as a whole, however, 

 was practically immobile, and in this respect was in sharp contrast 

 with the very active movements of some specimens of Rhinebothrium,, 

 which were associated with it. 



Following the head was a nearly cylindrical neck, which makes a 

 slight but abrupt enlargement a little less than l mm back of the head. 

 Transverse lines, which run from the margins towards the middle of the 

 lateral faces, very soon make their appearance, but do not meet so as to 

 divide the body into distinct segments until about 8 mm back of the head. 

 The segments are at first quite short. Farther back they become 

 squarish. Near the posterior end they are longer than broad. Four or 

 five of the posterior segments, excepting the last one, had beautiful 

 curving marginal outlines, being convex in front and concave behind. 

 The last segment was considerably elongated. 



The following measurements are from the living specimens : 



Millimeters. 



Length 20.00 



Length of head 1. 16 



Length of myzorhynchus 58 



Diameter of myzorhynchus 76 



Length of median constriction 14 



Diameter of median constriction 56 



Length of acetabular disk 44 



Diameter of acetabular disk 74 



Diameter of neck immediately behind head 30 



Diameter l mm back of head 36 



Length of median segments 13 



Breadth of median segments 50 



Length of segments near posterior end 40 



Breadth of segments near posterior end 40 



Length of last segment ' 66 



Breadth of last segment 28 



The habit of the body throughout is rather plump, inclining to cyl- 

 indrical. 



The specimen was further examined after it had lain some four months 

 in alcohol. When placed in glycerine the anterior bulb of the head 

 became transparent. Longitudinal muscular fibers could be seen enter- 



