[15] NOTES ON ENTOZOA OF MARINE FISHES. 733 



length, and 0.16 nmi in breadth at the apex, increasing to 0.2 mm in the 

 widest part. The length of the first segment is 0.2S mm , its breadth in 

 front O.H mm , behind 0.15 mm . The anterior segments for about 16" 1U1 back 

 of the head are quite slender. The body, indeed, for this distance is 

 decidedly filiform, and for that reason it is very difficult to determine 

 whether the bothria are to be regarded as marginal or lateral with ref- 

 erence to the body. Secondary segments appear at about the twelfth seg- 

 ment from the head. These are formed by a division of each segment 

 into two by means of a median transverse line. This is repeated farther 

 back in much the same manner as described under I), microcephalum. 

 This evidently explains the phenomenon which the posterior segments 

 present of being welded together in groups of three or four, an appear- 

 ance which is quite characteristic of the posterior segmeuts and which 

 has been alluded to in various descriptions of this species. The pos- 

 terior segments are squarish, with the posterior edge of each slightly 

 overlapping the following segments, and thus giving to the strobile a 

 serrate margin. 



About 40 mm from the head the reproductive organs become visible. 

 In a specimen rendered partially transparent with glycerine they appear 

 as a median row of white opaque masses 0.2 mm long and 0.06 111 ' 11 broad, 

 lying transverse to the longitudinal axis of the worm, parallel to each 

 other and very close together. The apertures of the reproductive or- 

 gans are lateral, all on one side, and may be seen following the median 

 line as a row of small elevated papillae. In the middle of the strobile 

 there sometimes appear to be as many as four or more papilla3 to a sin- 

 gle segment. These compound or fused segmeuts probably divide into 

 simple segments as they mature. Toward the posterior end of the 

 strobile, along with and on the reproductive papillae, are clusters of ova 

 which have been extruded from the ripe segments. The ova are yel- 

 lowish-brown in color. On this account the median segments have a 

 median band, which is equal in breadth to about one-third the breadth 

 of the segment, and which is rusty yellow, or yellowish-brown, or in 

 alcohol almost black. On either side of this median band the segments 

 are punctate with brownish spots. Upon the opposite lateral face of the 

 strobile also small bunches of ova were seen, which had beeu extruded 

 from minute pores in the vicinity of the median line. 



The ova are rather large, elliptical or long oval in outline ; length, 

 0.058 mm ; shorter diameter, 0.027 mm . 



The vessels of the water vascular system are quite distinct in a speci- 

 men which has been placed in glycerine, 



