12 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. «J4. 



CROSSOBOTHRIUM ANGUSTUM (Linton). 



Plate 1, fig. 5. 



1889& {OnjgmatohGthrium augustum), pp. 468-469, pi. 3, figs. 1-3. 



1890, pp. 796-799, pi. 7, fig. 3. 



1897a, p. 443. 



1900, p. 272. 



1901 (C. angusHnn), pp. 426,427. 



1905, pp. 339, 343. 



1908O, p. 114. 



1910a, p. 693. 



1911, p. 585. 



Records of this cestode not before published : 



(' archarhinus coninie rsonii. 



1907, July 26: 3 strobiles, and a few fragments; collected by Dr. 

 Davenport Hooker, at Tortugas, Florida. 



1923. On 7 dates in August, and one in September : Many, 14, 57, 

 1, 1, 1, 1, 5, 3; maximum length noted 34 mm. 



Carcharhinus limbatus. 



1915, August 6: 175, and numerous free proglottides in spiral 

 valve. 



1923, August 23 : 55, very slender, maximum length 80 mm., from 

 a 199-centimeter shark. 



Carcharhinus milherti. 



See page 7 for remarks on the species G. inilberti and G. oh- 

 sciirus. 



This is a common parasite of this and of the dusky shark, where 

 it is usually associated with other small cestodes in the spiral valve. 

 For example, the record for July 3, 1922, shows 6 G. angiistum, 69 

 A. laciniatum, and 185 P. lasium, with large numbers of free pro- 

 glottides in the spiral valve of a shark. 



Collected in the years 1915 and 1922. On 2 dates in July, 3 sharks 

 examined, 31 in one, 6 in another, and few in another, the latter 

 collected by Dr. G. A. MacCallum; on 8 dates in August, 17 sharks 

 examined: (1) a few found in each of 3 out of 6 sharks; (2) very 

 numerous; (3) 1 from each of 2 210-centimeter sharks; (4) 3, with 

 free proglottides; (5) 5 from a 135-centimeter shark; (6) 113 from 

 a 135-centimeter shark: (7) 9 from a 210-centimeter shark, 4, maxi- 

 miun length 22 mm., from a 210-centimeter shark, 71, maximum 

 length 22 mm., from 165-centimeter shark, 24, maximum length 23 

 mm., from a 135-centimeter shark; (8) 36, with free proglottides. 



Carcharhinus ohscurus. 



See page 7 for remarks on the species 6'. milberti and C. ohscurus. 

 See also under C. milberti. 



