92 PEOCEEDINGS OF THE NATIONAL. MUSEUM. vol. M.- 



Encysted stage. 



18976, pp. 810-811, pi. 66, figs. 11-15. 



1900, pp. 280-283. 



1901, pp. 432, 448, 449, 451, 458, 460, 471, 472, 482, 484, 486, figs. 243, 261- 

 264. 



1905, pp. 359, 362, 363, 365, 366, 369, 371, 377, 381, 385, 386, 388, 393, 395, 



399, 402, 404, 405, 409, 413, 415, 416. 

 1911, p. 589. 



Eecords of Ihis species not heretofore published : 

 Adult stage. 

 Carcharhinus mUberti. 



1915, August 18: In large numbers, the scoleces embedded in the 

 mucous membrane of the pyloric division of the stomach through- 

 out its entire length of 585 mm. They were not found in the stomach 

 proper, and only chains of proglottides without scoleces occurred 

 in the spiral valve. Enormous numbers of eggs were discharged 

 when the strobiles were placed in sea water, 



Carcharhinus ohscurus. 



1907, August 3: 1, at the beginning of the spiral valve, an un- 

 usual position; length, fixed, 112 mm. 



1918, September 6: 1 strobile, scolex missing; pyloric division of 

 stomach. 



(U.S.N.M., Helm. Coll. 7722.) 



Galeocerdo arcticus. 



1915, August 5 : 5, stomach near esophagus ; 1 attached alone, the 

 others in a deep and highly inflamed pit of the mucous membrane, 

 August 6 : Several attached to the wall of the stomach, near its an- 

 terior end; a number of them together in an inflamed and abraded 

 pit of the mucous membrane. Measurements of specimen in balsam : 

 Diameter of proboscis, excluding hooks, 0.045, including hooks, 

 0.072; length of longest hooks. 0.021; bulbs, length 0.59 to 0.63, 

 diameter, 0.15 to 0.18. 



(U.S.N.M., Helm. Coll. 7723.) 



Squulus acanthias. 



1910, August 3 : 1 scolex found in stomach, not attached. 



1911, May 25: Fragments of strobiles, 6, 9, and 14 mm. in length; 

 largest proglottides 3 mm. long, and 2 mm. broad ; appear to belong 

 to this species. 



Larval stage. 



Found encysted in many species of fish, on the viscera, but espe- 

 cially in the wall of the stomach and intestine, where its favorite 

 lodgment is the submucosa; in flesh of the sea robin {Prionotus caro- 

 linus) on two occasions. 



