[49] NOTES ON ENTOZOA OF MARINE FISHES. 7G7 



broad, were convex on the margins and bluntly rounded at the ends. 

 Another specimen, 10 mm in length, had a very irregular outline, the neck 

 greatly enlarged and the segments much shortened by contraction. A 

 fragment, 13 ,nui in length, although without a head, exhibited a de- 

 cidedly progressive motion. The segments were in a state of activity ; 

 their proportions of length and breadth changing rapidly. Some of the 

 segments of this fragment, when stretched out, had the shape of an 

 elongated parallelogram. One, while in this position, measured .4 mm in 

 length and .16 miu in breadth ; when contracted it was nearly square 

 with convex raargius, and measured .3 mm in length and .26 mm in 

 breadth. 



A small specimen, 6 mm in length, presents some anomalies. The 

 bothria are small as compared with the myzorhynchus. The latter is 

 elongated, conical, smaller at apex than base. 



When one of the normal scolices was compressed the bothria con- 

 tracted, and, so to speak, were absorbed in the head. The head was 

 rather swollen and globular, while the faces of the bothria, on the side 

 of the globular head, resembled the sucking disks of Taenia. 



When pressure was relieved the bothria were protracted again on 

 elongated pedicels, and became very variable in shape and size. When 

 the bothria were thus extended the head proper was much reduced in 

 size, and the pedicel of the bothria gave it a cruciform shape. 



The myzorhynchus was not observed to change its shape much, but it 

 is evidently capable of changing its form. There is a terminal os 

 which leads to an inclosed globular proboscis. It is probable that this 

 organ is susceptible of great variation in form, but I have never ob- 

 served it exhibit any other change than that which was incident to 

 greater or less protrusion. 



One peculiarity, which appears to be characteristic of this worm, 

 is the cylindrical form of the anterior part of the body. The neck, or 

 jointless part of the body, is cylindrical, as are also the anterior and me- 

 dian segments. The mature segments are also quite plump, but often 

 irregular in outline. In all the specimens which furnished material for 

 these data, the segments, with the exception of a few mature ones, are 

 exceedingly regular. The margins are parallel, and the posterior edges 

 project little, if any, so that the strobile for its anterior and median 

 portions has an almost entire outline. The cirrus, although not pro- 

 truded in any case that was brought under observation, was plainly 

 seen as it lay coiled up in its bulb. It is slender and echinate through- 

 out its entire length. 



Olsson figures jB7. variabiles with a rosette-like myzorhynchus, a feature 

 that I have never observed in any of my specimens. These speci- 

 mens which I have referred to E. variabile are also much like E. affine 

 of Olsson. I have not yet had an opportunity to examine type speci- 

 mens of European species. Upon comparison with type species this 

 form may prove to be specifically different from any of the closely re- 

 lated European species. 



