90 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. G4. 



been placed in sea water. In nn hour or two these eggs had become 

 a dark brown color. There appeared to be some variation in the 

 size of the ova, one of the larger measured 0.040 by 0.027. 

 1914. August 1 : 6, collected by Dr. G. A. MacCallum. 



TETRARHYNCHUS BICOLOR Bartels. 



Plate 8, figs. 79-80. 



18976, pp. 813-815, pi. 68, figs. l-«. 



1900, pp. 271, 277. 



1901, pp. 426, 427, 446, 448, 452, 482. 

 1905, p. 373. 



1911, p. 589. 



Following are records of this species not heretofore published : 



Carcharhinus milherti. 



1922, July 10 : 1 ; attached to wall of spiral valve, near anterior 

 end; inflamed patch of mucous membrane at point of attachment 

 about 15 mm. in diameter. The color of the scolex was deep pur- 

 plish red; length of strobile, 50 mm., diameter of scolex, 3 mm.: 

 greatest breadth of strobile, 2 mm.; collected by Dr. G. A. Mac- 

 Callum. 



Carcharhinus ohsourus. 



1905, August 14 : 2 ; head and neck, including collar, of one, deepy 

 purplish red; head and neck of the other the same, collar a lighter 

 shade; strobiles, 30 and 45 mm. respectively, a fragment of strobile 

 measured 110 mm. in length; largest proglottides, length 1.2, breadth 

 3 ; length of head and neck, 6.5 and 9. 



1907, July 31 : 2, in shark measuring 183 centimeters ; one of the 

 worms was firmly attached to the mucous membrane. Length of 

 longer, in sea water, 200 mm. Head not much differentiated from 

 neck ; head and neck cylindrical, longitudinally ribbed, except collar, 

 which is smooth, red (shade 1, Milton-Bradley Co.) ; deepest color 

 about the vicinity of the bulbs. The pigment in the head and neck 

 was not dissolved, either by the fixing fluid (chr.-acet.-form.), or the 

 alcohol in which it was preserved. The color still persisted when 

 this note was written, November 4, 1921, but disappeared as the speci- 

 men was dehydrated before mounting in balsam. 



Length of scolex at rest, 11 mm., stretching to 20 mm., or more;^ 

 diameter 1.75. The larger specimen was active, and contracted 

 strongly, becoming sinuously crumpled posteriorly, and spiral an- 

 teriorly. The scolex was also very active, contraction waves begin- 

 ning at the anterior end and passing posteriorly to about the middle 

 of the length, thus showing admirable fitness for the penetration of 

 mucous membranes. Color of strobile, cream, with a blotch of white 

 in the center of the face of ripe segments, where ova are clustered. 



