[11] NOTES ON ENTOZOA OF MARINE FISHES. 720 



longest of which measured 140 mm , becomes less significant when it is 

 remembered that the former when found was practically dead and con- 

 sequently there was little or no contraction of its tissues when ii was 

 transferred to water and to alcohol. The tissues of the other specimens 

 were living and were therefore liable to contract when placed in water 

 after removal from their host, or when first disturbed in their resting 

 place. 



The posterior third of the body of the specimen from H. yladius, as 

 in those from T. albirtus, is marked by a dark brown median stripe made 

 by the ripe ova in the crowded ovaries. A median furrow on one of the 

 lateral faces of the body begins towards the anterior and becomes punc- 

 tate towards the posterior region, where the minute lateral genital 

 apertures become visible in a zig-zag row. The margins of the strobile 

 are apparently entire. The segments are very short, with their poste- 

 rior edges slightly wavy on the median segments, thus suggesting those 

 of D. plicatum. The posterior edges of the median segments are 

 crowded together like the edges of the leaves of a book about .2 mm 

 apart. Near the posterior end they are not so closely crowded, being 

 about .4 mm apart. The anterior part had undergone decomposition to 

 such an extent that it was reduced to a mere filamentary shred which 

 gave no sign of the presence of either bothria or segments. 



The ova in this specimen are identical with those in the other lot. 

 They present also the same features noted in the case of the others ; 

 that is there seem to be two sorts, one yellowish in mounted specimens, 

 with a strong shell, in some cases white and opaque; another sort 

 transparent, with a very thin shell. The latter, in specimens stained 

 with carmine, have a granular contents which is colored by the stain- 

 ing fluid. They are entire in outline, oval, length as much as .05 inm , 

 shorter diameter .03 mm . These measurements were obtained from both 

 lots. Transparent yellowish ova were found which were usually col- 

 lapsed on one side, thus being bowl-shaped. They measured .054 mm and 

 .027 1 " 111 in their two diameters. The diameters of ova given in my origi- 

 nal description of this species are .045 imu and .03 mm . These dimensions 

 may be taken as average. 



Anatomy. Transverse sections, made through that part of the body 

 which is immediately in front of the segments that contain ripe ova, 

 show that the body is made up of a series of concentric layers of 

 muscular tissue surrounding a flat core. Next to the thin cuticle is a 

 thick granular layer in which lie radiating, longitudinal, and circular 

 fibers. Of these the circular fibers are the finest. They appear, 

 indeed, as delicate hair-like lines under an enlargement of 600 diam- 

 eters. 



The granules in the outer layer in longitudinal sections, stained with 

 carmine, in many places appear as clusters or nests of nuclei. Towards 

 the posterior end of each segment the circular fibers become more numer- 

 ous about the middle of the outer concentric layer, and presently the 



