[31] NOTES ON ENTOZOA OF MARINE FISHES. 749 



part contains a narrow convoluted tube which appears to be a part of the 

 vas deferens. The coils in the outer part when cut across appeared in 

 section as concentric rings, thus proving that they were the coils of the 

 invagiuated cirrus. The coils in the inner part, in the same section, 

 gave no evidence of concentric rings, but were filled with small gran- 

 ules. The latter had sharp outlines and were of nearly uniform size, 

 003mm j n diameter. There was in these sections no evidence whatever 

 of a segmented condition of the body except in the projecting edges. 

 The central part of the body appeared to be absolutely continuous. 



The musculature, as revealed by a low magnifying power, consists of 

 an outer circular layer, covered by the cuticle, and an inner longitudinal 

 layer. The latter is very strongly developed. The fibers of which it is 

 composed are many times larger than the circular fibers. They show 

 by their irregular course, looking as if anastomosing with each other 

 in an irregular network, that they were in a state of profound contrac- 

 tion at death. 



In some transverse sections from the middle of the body, a convo- 

 luted tube was observed which lay beside the cirrus bulb and appeared 

 to open at the outer end of that organ. It follows that face of the bulb 

 which is toward the middle of the marginal projection. Its outer end 

 is wide and appears to be a kind of receptaculum seminis. It can be 

 traced to a glandular mass of uncertain outlines, presumably the ovary, 

 in the middle of the segment. If this is the vagina, then both repro- 

 ductive organs open marginally. It can not be a part of the vas deferens, 

 because the latter was seen as a distinct tube, entering the base of the 

 cirrus bulb and connecting with the coiled tube in the inner part of the 

 bulb. 



On a few segments from the middle of the body, small lateral openings 

 were observed, which were situated about half way between the median 

 line and the margin. These were on but one of the lateral faces and 

 were not found on many segments. They are probably pores which 

 communicate with the oviduct and are designed for the escape of ova. 



The segments from the posterior end of the strobile have a space in 

 the center filled with ova. These are large with thick shells and gran- 

 ular contents. The normal shape is long oval but owing to the appar- 

 ently plastic nature of the shells they occur in very various shapes. 

 Measurements of the largest perfect ones gave the length as much as 

 ,l mm , with the shorter diameter from .04G ,um to .063 m,u . The shell as 

 seen by transmitted light has a thickness of .0025 mm . A few ova were 

 observed with one end truncated. From this fact I am led to suspect 

 that the ova of this species may be provided with a terminal operculum 

 for the escape of the embryos, but this can not be demonstrated from 

 my mounted sections. 



There are several discrepancies to be found in existing descriptions 

 of this worm. Diesing and others recognize a neck. Dujardin states 

 that there is no neck. I believe that there is no true neck, but that 



