168 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 bothrium. 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 0.11, 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 m1, 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 coste, 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. 787-704, plate vi, figs..s—to. , Proce U. 7S, Nat 
Mus., vol. xx, p. 443. Bull. U. S. F. C., 1880, 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 to. 
7. Discocephalum pileatum Linton. 
(Plate 1, 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 (Carcha- 
rhinus 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 13th they were seen to 
