1 68 Papers from the Marine Biological Laboratory at Tortugas. 



The bothria are mounted on distinct cylindrical pedicels, and appear as 

 if hinged in the middle. There are twelve loculi visible in a side view. 

 There are therefore probably ten pairs of loculi with an odd loculus at each 

 end, making 22 loculi on each bothrinm. The neck is distinct from the 

 body and in life had two small red pigment spots at the base. Pedicels and 

 neck minutely spinose. Fine transverse lines occur very close behind the 

 neck, preceding the first segments, which are very short. The succeeding 

 segments increase in length until they are about as long as broad, then in- 

 crease in length but decrease slightly in breadth. The last segment seen 

 measured 0.35 mm. in length and 0.07 mm. in breadth. Another strobile 

 was about the same breadth throughout. 



Dimensions, in millimeters, of specimen mounted in balsam : Length 

 1.28; length of bothria 0.20; length of pedicel o.u, diameter 0.05; length 

 of neck 0.14; diameter of neck, anterior 0.05, base 0.07; breadth of body 

 just behind neck 0.08; last segment, length 0.35, breadth 0.08. 



5. Spongiobothrium variabile Linton. 



Report U. S. F. C., 1886, pp. 462-464, plate n, figs. 13-16. Report U. S. F. C.. 

 1887, pp. 778-780. Proc. U. S. Nat. Mus., vol. xx, p. 442. Bull. U. S. F. C.. 

 1899, pp. 275, 432. Bull. Bureau of Fisheries, vol. xxiv, p. 347. 



Four specimens were found in the spiral valve of a sting-ray (Dasyatis 

 say}, July 10. The bothria of these specimens were in unusually fine con- 

 dition, making possible the following note on their structure: The bothria 

 of the living worm are very flexible and bear some resemblance to those 

 of Rhinebothrium. They are without costse, but are provided with numer- 

 ous loculi along the margins. When they are placed in alcohol they assume 

 the characteristic crumpled appearance of the type. 



6. Phyllobothrium foliatum Linton. 



Report U. S. F. C, 1887, pp. 787-794, plate vi, figs. 5-10. Proc. U. S. Nat. 

 Mus., vol. xx. p. 443. Bull. U. S. F. C., 1889, pp. 275, 433. Bull. Bureau of 

 Fisheries, vol. xxiv, pp. 340, 347. 



One strobile, with the scolex missing, was found in the spiral valve of 

 the sting-ray (Dasyatis say}, July 10. 



7. Discocephalum pileatum Linton. 



(Plate i, fig. 8.) 



Report U. S. F. C., 1887, pp. 781-787, plate x, figs. 1-7. Year Book of Carnegie 

 Institution of Washington for 1906, p. 116. 



One specimen was found in the spiral valve of the cub-shark (Carclia- 

 rhiints platyodon}, July 12. 



The worm was very flat and thin and the muscular head was firmly 

 embedded in the intestinal wall ; color white, except the corrugated neck, 

 which was olivaceous. The posterior segments contained ripe ova, which 

 were of a faint greenish tint. On the morning of the i3th they were seen to 



