[39] 



NOTES ON ENTOZOA OF MARINE FISHES. 



757 



Iii No. 1, all the segments were remarkably clear cat and definite. 

 The posterior end of the neck and first segment laciniate. At about 

 the twenty-fifth segment back of the head the lappets become rounded 

 and the segments closely crowded together, with a broad emargination 

 on the posterior edge. This emargination gradually deepens as the 

 segments become broader. At about the eightieth segment it becomes 

 a deep round notch which persists in the mature segments. The genital 

 apertures were marginal at about the anterior fourth. The bothria were 

 very flexible and the pedicels extensible. The individuals in this lot 

 exhibit the same varieties noticed in the two other lots. Some of these 

 varieties are described in connection with the lot collected August 12, 

 1887. It is to be noted, however, that the differences that appear to be 

 so profound in the alcoholic specimens were not so obvious in the living 

 specimens. 



The following measurements are of specimens belonging to a lot col- 

 lected August 12, 1887 j No. 1 a living, Nos. 2 and 3 alcoholic speci- 

 mens: 



In this lot there were five specimens. They were associated with one 

 specimen of the new species, Platybothrium cervinum, eight specimens of 

 Orygmatobothrium anyustum, nine of Phoreiobothrium lasium. All were 

 in the spiral valve. There was also one young purple-red Rhyncho- 

 botlirlum adhering to the mucous membrane of the pyloric part of the 

 stomach. The place of attachment of the latter parasite was locally in- 

 flamed. There was also another ulcerated spot near by. 



In all the Anthobothria of this lot the first segments begin almost im- 

 mediately behind the head, without an evident neck, and this, too, in 

 specimens which are much attenuated in front as well as in those which 

 are much contracted, so that the first segments are short and crowded 

 together. 



Two of the alcoholic specimens have the anterior segments very much 

 attenuated. The bothria also are very much altered in shape from what 

 was observed in the living specimens. In them the pedicels are elon- 



