[43] NOTES ON ENTOZOA OF MARINE FISHES. 7G1 



bothrium and beyond the middle point is thrown into numerous small 

 folds (Plate iv, Fig. 5). In front view, the bothria look like a cluster of 

 white rosettes with contiguous edges in contact, and thus leaving a four- 

 sided central space. There is no indication of a terminal papilla to the 

 head or supplemental disc on the bothria. In the alcoholic specimen 

 the outline of the bothria has changed from nearly circular to that of a 

 sector of a circle. This is caused by the flattening of the sides of the 

 bothria, which touch each other. 



Although the specimen was rather active when first placed iu sea- 

 water, it showed little tendency to change either the shape or the rela- 

 tive position of the bothria. After it had lain in sea- water for twenty- 

 four hours it still exhibited moderate activity. The bothria were then 

 found to be 3 mm in length, measured from the base of the pedicel to the 

 outer margin of the convoluted face, when the head was inclined for- 

 ward so as to lie nearly on the faces of the bothria. 



The resemblance of the head of this worm to a head of cauliflower is 

 very striking. This simile has been employed by Van Benden also in 

 his description of Phyllobothrium lactuca. 



The living specimen had the following dimensions : Length, 550 mm j 

 diameter of head across the top, 4.5 mm ; diameter of neck near the head, 

 1.6 mm ; thickness of neck, l.l mm ; length of last segment, 2 min ; breadth 

 of last segment at anterior end, 1"""; at posterior end, 2 m! ". The spiral 

 intestine contained enormous numbers of free proglottides which were 

 about 4.5 mm long and 3 mm broad. 



In the alcoholic specimen the breadth of head across the top is about 

 4 imn ; diameter of a single bothrium 2.4 mm ; diameter of pedicel at base, 

 l.I" im , near bothrium 1.4 mni ; length of pedicel and bothrium l.C mm . 



Immediately behind the head the neck is a little wider and much 

 thicker than it is one or two millimeters farther back. Fine trans- 

 verse lines are visible almost immediately back of the head, but distinct 

 segments do not appear until about 25 llim back of the head. The transi- 

 tion from fine transverse lines to the sharp division into segments is so 

 gradual, that the first distinct segments can be located only for a limit 

 of four or five millimeters. At the distance of G0 ram from the head the 

 segments average 2 mm iu breadth and about .03 mm in length. At this 

 point the segments are broader on the posterior edge than the anterior. 

 The posterior corners are therefore slightly salient and sharply and 

 clearly cut. For the last 200 mm the segments appear to be mature. 

 They did not, however, separate easily. They have a rounded or para- 

 bolic outline in front and are quite distinct from each other. The trans- 

 verse line, which marks the division between two segments, is uiucli 

 shorter than the base of the segments. The mature segments are 

 uniform in size, and symmetrical. The cirrus was extended in many of 

 the posterior segments as much as .9 mm , with a diameter at base of from 

 .1 to .16 Ilim and at apex of .08 mm . In the alcoholic specimen some of 

 the cirri are extended farther than they were observed to be in life. 



