ART. 21. PARASITES OF SHARKS AND SKATES LINTON, 53 



OTOBOTHRIUM DIPSACUM Linton. 



1897&, pp. 806-7, pi. 66, figs. 1-5 

 1901, p. 451. 

 1905, p. 375. 

 1911, p. 586. 



Only the encysted stage of this cestode has been found ; in Poma- 

 tomus saltatrix^ in the Woods Hole region, and in Centropristes 

 striatum, at Beaufoit, N. C. Following are records not before pub- 

 lished : 



Geratacanthus scJioejifli. 



1915, August 21 : 7 large cysts from body cavity, maximum 17 by 

 7, minimum 7.5 by 3.25. A cyst, 9 by 6 mm. when opened, released 

 a plerocercus, length 5.25, diameter 3 mm. Under pressure a scolex 

 with the characteristic proboscides of this species was seen; 1 fish 

 examined. 



1920, July 28, Large cysts, for the most part rather triangular in 

 outline, from viscera; maximum 20 by 10 mm. 



( U,S.N,M,, Hehn, Coll. 7697.) 



Mycteroperca falcata. 



1911, June 5; Cysts from serous coat of intestine, long-clavate, 

 bluish black, for about half the length from the smaller end; one 

 measured 24 mm, in length, and 6 mm, in diameter at larger end, 

 tapering to 2 mm. at the smaller end; another 17 by 5; larva, length 

 2.5, breadth of head 1,5, Collected by Dr, F, A, Brink, State board 

 of health of Florida, Pensacola, Florida. 



Pomotomus saltatrix. 



1904, July 22: 1, plerocercus about 12 mm. in lengih, and 6 mm, 

 in diameter; length of larva 3,68, of head and neck, scolex, 3,45, of 

 bothriimi, at rest, 1,35; diameter of head, in front, 0,60, at base of 

 flaring bothria, 1,65 to 3,15, very variable, contracting and expand- 

 ing; diameter of neck, behind head, 0,75, at base of bulbs, 1.20; 

 length of bulbs 1,50, diameter 0,22 ; diameter of proboscis, including 

 hooks, 0.22. 



Xiphias gladius. 



1920, July 27 : 1 cyst from viscera, oval, 12 by 6 mm. ; 2 fish ex- 

 amined. 



OTOBOTHRIUM PENETRANS Linton. 



Plate 7,' figs. 60-70. 



1905, Otohothrium, species, pp. 357-358, figs. 102-109. 

 1907d, O. penetrans, p. 100, pi. 6, figs, 39-48, 

 1908O, p, 114, 

 19105, p. 1202. 

 This specific name was first used to designate certain larval cestodes 

 found encysted in the flesh of the gar, Tylosurus acus in Bermuda 



