Helminth Fauna of the Dry Tortugas. 167 



p. 300, plate 42, fig. 100; Pintner, Sitzungsbr. der kaiserl. Akad. der 

 Wissensch., Bd. cxn, p. 563, Taf. i, fig. i). 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 larvae 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 in, figs. 

 10-13, and plate iv, figs. 1-3. Proc. U. S. Nat. Mns., vol. xx, p. 439. Bull. 

 U. S. F. C. for 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 lacinise 0.25 ; length of first segment o.n. 



There are about eight laciniate segments. Behind these the segments 

 become more and more crowded, the lacinise become indistinguishable, and 

 the segments are represented by transverse striae 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 o.i 6 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 y, figs. 3-5. Bull. U. S. F. C., 

 1899, pp. 275, 433. Bull. Bureau of Fisheries, vol. xxiv, 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 i, 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. 



