64 



PKOCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 64. 



KHYNCHOBOTH«IUM HISPIDUM Linton. 



1890, pp. 833-835, pi. 11, figs. 12-17. 



1900, p. 275. 



1901, p. 433. 



1905, pp. 345, 348; fig. 146. 



1908&, p. 184. 



1910fl, p. 695. 



1911, p. 587. 

 Adult stage. 

 Dasyhatis centrura. 



1903, September 1 : Noted, but number not recorded. September 

 20 : 6, length 4 mm., with 4 free proglottides. 



1904, August 20 : Numerous. 



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



1922, July 15 : 1. July 31 : 1, from each of two small sting rays. 

 Also on same date, 1, from large sting ray, 270 centimeters in 

 length, collected by Dr. G. A. MacCallum. 



1923, July 20 : 2 ; August 15:2; August 20 : 3 in each of 2 sting rays. 

 (U.S.N.M., Helm. Coll. 7702.) 



Encysted stage. 



Tautoga onitis. 



1904, August 12: 1, from cyst. 



1910, July 9: 1, scolex with red pigment blotch in neck, escaped 

 from plerocercus. August 6: 1, similar to foregoing; sucker-like 

 organ at base of plerocercus. August 30: 1, like specimen collected 

 on preceding date. 



RHYNCHOBOTHRIUM IMPARISPINE Linton. 



ADULT STAGE. 



1890, pp. 840-843, pi. 12, figs. &-9. 

 1897a, p. 450. 



1900, p. 275. 



1901, pp. 431, 432, 434, figs. 251- 

 254. 



1910a, p. 694. 

 1911, p. 588. 



LARVAL STAGE. 



1897 &, pp. 788, 799-801, pi. 64, figs. 

 9-12. 



1890, p. 276. 



1891, pp. 436, 437, 445, 456, 458, 475,1 

 476, 482, 484, 485, 488. 



1910a, p. 694. 

 1910?), p. 1201. 



1911, p. 588. 



1912, p. 2 (of reprint). 

 1914, p. 53. 



This cestode is a common parasite of skates belonging to the genus 

 Raja. It has been found in the adult stage, with ripe proglottides, 

 in Narcacion nohilianvs, Raja eglanteria, R. erinacea, R. stahuUforis, 

 and Squalls acanthiafi. In the encysted stage it has been found in 

 a large number of species of teliosts. 



Following are records of R. im'parispine not before published. 



