74 PROCEEDINGS OF THE NATIONAL MUSEUM. von. 64. 



amined; 13 dates in November, 1 to 27 cysts on each date, 65 fish 

 examined. 



Following are typical records, the first, of a piece of intestine, the 

 second, of a portion of the pyloric caeca : 



1913, October 29: Numerous pyriform cysts on serous coat of in- 

 testine, some embedded in wall of intestine, the latter, in many cases 

 with cheesy degenerate tissue ; cysts of various sizes, largest about 5 

 mm. in length. The bottle contained a piece of intestine, 7 centi- 

 metei*s in length, which was thickly beset with cysts. 



1914, October 28 : Numerous cysts on pyloric caeca ; a small piece 

 of pyloric caeca in the vial contained 50 cysts, surface count, in a 

 space 20 mm. square ; 114 cysts were removed from the piece. 



Xiphias gladius. 



1904, July 15: Few, from peritoneum, cysts, with plerocerci and 

 scoleces, 4 fish examined. July 21 : Cysts on viscera, also in intestine, 

 probably recently introduced with food. 



RHYNCHOBOTHRIUM INSIGNE, new species. 



Plate 11, fig. 9&-107. 



Bothria emarginate, as broad, or a little broader than k)ng, lateral, 

 rather thick in contracted condition, and widely divergent. Neck 

 of scolex very long, subcylindrical, and linear to near the base, where 

 it increases in breadth rather abruptly, but is still narrower than the 

 anterior end of the strobile. Hooks on the proboscides of a great 

 variety of shapes and sizes. There is a cluster of very small, scale- 

 like hooks on one side of the base. This side of the proboscis carries 

 small, slender spines of varying length, and rather sparsely set to- 

 ward the middle of the area. In the middle of this area is the most 

 characteristic feature of the armature, in the shape of a linear row of 

 very closely crowded hooks with broad bases (figs. 105-7). These 

 hooks become so much crowded, about one millimeter above the base 

 of the proboscis, as to have the appearance of being made up of two 

 rows of hooks (fig. 106). The nature of the overlapping whicn gives 

 rise to this appearance is shown in the figiu'e. At IJ mm. from the 

 base, which was as much as the proboscis was everted, the hooks in this 

 linear row are still closely crowded together, but the appearance of 

 being made up of two rows is almost wholly lost (fig. 107). On 

 either side of the area, of which this linear row of closely crowded 

 hooks is the center, there are larger hooks, which are long and 

 slender, with a tendency to have rather abruptly recurved tips. The 

 hooks on the two sides of the small-hook area are not quite symmet- 

 rical. They are separated on the opposite side of the proboscis by 

 two longitudinal rows of relatively large, strongly recurved hooks, 

 with elongated bnsal supports, and with the tips of one row inclined 



