[71]' NOTES ON ENTOZOA OF MARINE FISHES. 789 



reticulated like tbe remainder of the face, is divided into comparatively 

 regular elongated loculi, about .G"" n long and .3""" wide. The rounded 

 ends of these locular cells give a crenulate outline to the edge of the 

 bothria. 



An oblong reddish patch .2 mra in length and .06 mm in breadth, lying 

 transversely to the axis of the body, is situated in the head, about .12 ,mu 

 back of the apex or angle formed by the two pedicels. 



On the lateral face of the head four shallowpits or pores wereobserved, 

 about .05""" apart, along the median line. The first two w r ere narrow, the 

 greatest diameter, about .12 mm , transverse to the axis of the body. 

 The third is rounder, deeper, and more evident than the others j its 

 diameter about .08 mm . * 



At the apex of the head, that is, in the angle formed by the pedicels, 

 there was a low papilla not well denned. The pedicels were marked 

 with longitudinal rugae. 



The neck, at a distance of .34 mm from the apex of the head, was .64 mm 

 broad ; at the distance of l mm it was about .4 mm in diameter. Like the 

 head it was flat, thin, and smooth, and decreased in lateral diameter 

 for some 4 mm or more back of the head. The aquiferous vessels could be 

 seen passing up to the head and lying, two on each side, about .l mm from 

 the margin. The margins of the neck outside the longitudinal aquif- 

 erous vessels seemed to be made up largely of transverse muscular tis- 

 sue, and the central part of a mass of longitudinal spiral vessels. The 

 latter are shown further on to be bundles of longitudinal muscle fibers. 

 Transverse striae appeared about 7 mm from the head. The first dis- 

 tinct segments were about ,04 mm long and .4 mm broad. Towards the 

 posterior end the segments became squarish, then longer than broad. 

 Near the posterior end the segments grew somewhat narrower. At 

 10 mm from the posterior end the segments were .5 mm long and ,72 mm 

 broad; the last segment was l mm in length and ,34 mm in breadth. The 

 posterior segments of this specimen in alcohol are elongated, with nearly 

 parallel margins ; the strobile is therefore not moniliform, as is usual 

 in the specimens of the other lots. 



The foregoing description is based on a specimen that had lain for 

 twenty-four hours in sea- water. It was still capable of motion, and was 

 at first rather transparent. After some two hours more the head and 

 bothria became opaque, and the latter contracted. The measurements 

 were made while the specimen was lying free in the water. 



In the specimens of the lot collected August 1, from which the 

 sketches of living forms were made, the red pigment spot in the head 

 was not observed, neither were the lateral pits nor the terminal papilla, 

 which was faintly indicated in this specimen. In the specimens col- 

 lected August 10, I recorded in my notes the following observations : 

 Head and body yellowish white, neck bluish white ; last segments with 

 large ivory-white opaque spot in the center. 



