[23] NOTES ON ENTOZOA OF MARINE FISHES. 741 



iug, so that it was not possible to determine the normal condition of the 

 posterior segments. 



The ova are amber colored, oval, .07 and .04 mm in the two diameters. 

 They are usually collapsed on one side into a bowl-shape. They are 

 observed in some cases lying in small clusters and making a zigzag line 

 on one of the lateral faces of the strobile. The masses of ova within 

 the strobile do not seem to coincide with the segment, but, as they de- 

 velop, push into the adjoining segments, so that the median line of ova 

 is an almost continuous one. 



The cirrus is long, slender, marginal, irregularly alternate, and pro- 

 trudes from the middle part of the margin of a segment. 



The cirrus bulb is piriform, and lies with its larger end towards the 

 middle of the body. It is directed a little posteriorly, and extends a 

 little beyond the marginal vessel of the water vascular system. The 

 longest cirrus observed measured l mm in length, and was ,04 mm in 

 diameter at base, and .02 mm in diameter at the apex. The segments 

 are deeply wrinkled, at the marginal genital aperture, the wrinkle 

 extending about one- third way to the median lateral line. 



The marginal vessels of the water vascular system can be easily traced 

 when the specimens are placed in glycerine. Their x)osition is shown 

 in the figures. It will be observed, from Fig. 6, that the vessels unite at 

 the posterior end, at which point there is a terminal pore-like pit. 



The foregoing remarks are based on what could be made out without 

 the aid of thin sections. On account of limited time from other duties, 

 and the large amount of material upon which I have to report, 1 can do 

 little at present in working out the detailed anatomy of the Entozoa 

 referred to me for identification. I have made, however, in this case 

 a tew sections which enable me to demonstrate some points in the 

 anatomy of this worm that may be properly recorded in this place. 



Anatomy of the head and first segments. — Both transverse and longi- 

 tudinal sections of the head and first segments and of mature pro- 

 glottides were made from specimens stained in toto in carmine and 

 ha?matoxylon, respectively. 



The sections were about .02 mra thick. 



The first two transverse sections of the head are densely and coarsely 

 granular at center, finer toward the edges, with fine interlacing muscu- 

 lar fibers. The coarse granules are evidently the cut ends of longi- 

 tudinal muscular fibers. In shape they are irregularly triangular. In 

 the third section the interlacing fibers are more plainly seen and there 

 are besides four clear spaces so situated that if they were joined by 

 straight lines they would mark the four angles of a parallelogram. The 

 coarse granules still constitute the mass of the tissue. In the next three 

 or four sections the clear spaces are better defined and the longitudinal 

 muscles are not so dense at the center. Each clear space is joined to 

 its fellow along the longer side of the parallelogram by a curved line 

 which is convex towards the center. Transverse muscular striae, .002 mm 



