ART. 11'. A NEW CESTODE FROM SHARKS — LINTON. 5 



men, but crystalline lenses and teeth of fish were found in one of the 

 bottles containing material from this host, examples of which had 

 been examined by Mr. Edwards on different dates, all in the same 



month. 



The specimen was much contracted, being coiled in a close spiral 

 at the anterior end. The scolex and neck were of a lighter color 

 than the body, which was yellowish white. The breadth of the 

 scolex was 2.5 mm., of the neck 2 mm. ; posterior segments long and 

 narrow with a dark line along the median axis. Length of strobile, 

 estimated, 90 mm. 



September 1, 1903. A small maneater shark, 4 feet in length, 

 was examined by me at Woods Hole on this date. The stomach con- 

 tained fish and squid. About 50 of these cestodes were found, most 

 of them in the spiral valve, but a few, 2 or 3, in the stomach. As 

 most of these strobiles appeared to be immature, and, moreover, were 

 associated with jaws and pens of squid, they were interpreted as 

 having been introduced with squid. Tw^o of the strobiles were 

 longer and stouter than the others, which measured about 30 mm. 

 in length. They all contracted strongly when placed in killing 

 fluid. 



June 11, 1906. Five specimens were collected by Mr. Edwards 

 from a maneater shark taken off Nantucket on this date. The 

 stomach was empty. These worms, as preserved specimens, were 

 much contracted, and more or less coiled. One, straighted in glyc- 

 erin, measured 30 mm. 



July 1, 1906. A 6-footjnaneater shark, taken in Buzzards Bay near 

 Woods Hole, was examined by me on this date. Lenses of fish were 

 found in the stomach. In the spiral valve v/ere found 20 cestodes of 

 this species, with numerous free proglottides containing eggs. The 

 eggs were small, spherical, wath rather weak shells, and were dark 

 colored. Length of strobile about TO mm. They were rather active 

 and had a tendency to crumple and tie themselves in knots. Ripe 

 proglottides flattened under cover-glass measured 9 mm. in length 

 and 3.5 mm. in breadth. Bothria, more or less expanded, were ob- 

 tained by dropping formaldehyde on scoleces while they were still at- 

 tached to the mucous membrane of the intestine. 



August 17, 1916. A maneater shark measuring 12 feet 7 inches, 

 taken at Menemsha Bight, was examined on this date. The shark had 

 been dead for at least one day, but the scoleces, three with strobiles and 

 one without, were still quite active. The stomach of the shark was 

 empty, but the contents of the spiral valve were dark colored, sug- 

 gesting that squid had been recent food. It was noted that the be- 

 havior of the bothria was like that of the larval forms often found in 

 squid. The auxiliary suckers were alternately extended and retracted 



