Helminth Fauna of the Dry Tortugas. 167 
p. 300, plate 42, fig. 100; Pintner, Sitzungsbr. der kaiserl. Akad. der 
Wissensch., Bd. cxi1, p. 563, Taf. 1, fig. 1). In this specimen, which is 
about 3 mm. in length, these structures are not found in either the anterior 
fifth or the posterior sixth. Anteriorly they are very closely crowded to- 
gether, posteriorly they are less crowded, and the pyriform shape and race- 
mose clustering can be seen. 
These larve probably represent the encysted stage of a cestode which 
is adult in the tern or some other fish-eating bird. 
2. Anthobothrium laciniatum Linton. 
Report Commissioner of Fish and Fisheries, 1887, pp. 754-759, plate 111, figs. 
10-13, and plate tv, figs. 1-3. Proc. U. S. Nat. Mus., vol. xx, p. 439. Bull. 
Weise], (Gs tor 1899, p. 411. Bull. Bureau of Fisheries, vol. XXIV, pp. 
339, 343. 
One example of this species was found in the spiral valve of a cub-shark 
(Carcharhinus platyodon), July 12. 
Dimensions, in millimeters, of living specimen: Breadth of head 0.23; 
bothrium, variable, length, at rest, 0.35, breadth 0.23; neck, length 0.28, 
breadth 0.07; first segment, length 0.14, breadth 0.07. This specimen, 
mounted in balsam, has the following measurements: Length 3.5; distance 
to first laciniz 0.25; length of first segment 0.11. 
There are about eight laciniate segments. Behind these the segments 
become more and more crowded, the laciniz become indistinguishable, and 
the segments are represented by transverse striz about 0.014 mm. or less 
apart, and making the margins bluntly serrate. There is continuity, how- 
ever, from the laciniate anterior segments through the compressed segments 
to the larger segments at the posterior end. Of these there are six, averag- 
ing about 0.16 mm. in length and 0.08 mm. in breadth. The greatest breadth 
of the strobile is in the region of compressed segments, where it is 0.26 
mm. in breadth. 
3. Rhinebothrium flexile Linton. 
Report U. S. F. C,, 1887, pp. 768-771, plate v, figs. 3-5. Bull. U. S. F. C.,, 
1899, pp. 275, 433. Bull. Bureau of Fisheries, vol. xxrv, pp. 342, 347. 
One specimen was found in the southern sting-ray (Dasyatis say), July 
10, with numerous loculi, which appears to belong to this species. Unfor-- 
tunately the specimen was lost before further notes were made on it. 
4. Rhinebothrium sp. 
(Plate 1, figs. 3 and 4.) 
A few specimens found in the southern sting-ray (Dasyatis say), July 
10, resemble a species found in this ray at Beaufort, North Carolina. A 
brief description was published in the Bulletin of the Bureau of Fisheries, 
vol. xxiv, p. 347, No. 5. The condition of this material is such that the 
bestowal of a specific name seems to be hardly justified. 
