122 BULLETIN OF THE BUREAU OF B'ISHERIES. 



HABITATS OF THE PARASITE. 



The following list of hosts in which this species has been found is a compilation 

 of both nublished and unpublished notes of my collections made at Woods Hole, 

 Mass., aje vufort, x\. C, Tortugas, Fla., and in Bermuda. 



ADULT STAGE. 



In spiral valve of the following hosts: 



Ckirdinrldnus obscurvs {''.). Dusky Shark. 

 Beaufort, N. C: 



1902— Aug. 120, few. 



Ca rch arh l n us platyodon. 

 Tortugas, Fla.: 



1006. — July 12, two small specimens. 



Scoliodon terrie-novx. Sharp-nosed Shark. 

 Beaufort, N.C.: 



1901. — July 16, one, length 10 mm. : free segments, length .3 mm. 

 July 18, two. 



July 22, six, length 1 to 7 mm.; posterior segments easily detached. 

 July 22, three. 

 August 15, one. 

 1902. — July 11, twenty-nine from one shark; also numerous cysts with scoleces 



in stomach wall. 

 This shark was examined on 18 other occasions when this parasite was not found. 

 All the sharks of this species which were examined were, with one exception, small, 

 2.'i to oO cm. ; one measured aboi.it 100 cm. 



Sphyrna zygiena. Hammerhead. 

 Woods Hole, Ma.ss.: 



1S86.— July 28, one hundred and iifty. 

 1887. — July IS, one hundred. 



Chyle swarming with free ]>roglottides in each case. 

 1898.— July 21, tlu-ee.' 



A small luuumerhead was examined on August 5, 1898, another on August 18, 

 and another on July 31, 1899. Otobothrium crenacolle not found on either date. 



ENCYSTED STAGE. 



Balistes carolinensis. "Turbot." 

 Bermuda: 



1903. — July 14, a few small cysts in walls of stomach and intestines. 



Jidy 22, a few cysts in intestinal wall. 

 The closely related species Balistes vetula was examined also. There were 

 numerous cysts in the intestinal wall, but all that were opened contained only 

 chalky, degenerate tissue, with no trace of parasite. 



