ART. 21. PARASITES OF SHARKS AND SKATES LINTON. 9 



Not found in large numbers in this skate. For example : On May 

 15, 1914, 14 strobiles were found in 1 of 35 skates examined for 

 parasites by Mr. Edwards. 



A scolex, stained and mounted by Dr. G. A. MacCallum on August 

 17, 1914, showed that there are 8 loculi on each bothrium, one at each 

 end, and separated by three paired loculi 



Raja eglanteria. 



1910, September 21 : Free proglottides, about 15, largest about 6.5 

 by 2 mm. 



Raja erinacea. 



Collected in 6 of the years from 1905 to 1913, inclusive : On 1 date 

 in April, 1, length 21 mm. ; on 2 dates in July, 6, and free proglottides 

 on 1 date, 4, each 100 mm., or more in length, slender, on the other; 

 on 2 dates in August, 2, small, and a few free proglottides on 1 date, 

 number not recorded on the other, large and small, maximum length 

 60 mm., in alcohol; on 1 date in October, 3 and a few fragments, from 

 2 skates ; on 1 date in November, many free proglottides. 



-(U.S.N.M., Helm. Coll. 7661.) 



R. stahuliforis. 



Collected in 4 of the years from 1907 to 1916, inclusive: On 2 

 dates in April, 1 length 45 mm., on 1 date, 4, with numerous frag- 

 ments, and free proglottides on the other; on 1 date in May, a few 

 short chains of immature proglottides, 2 with scoleces, and a large 

 number of free proglottides, largest from 5 to 8 mm. in length, and 

 from 2 to 3 mm. in breadth. One immature scolex, which appeare to 

 belong to this species, would probably have been recorded as Scolex 

 polymorphus if it had not been associated with scoleces of E. varia- 

 Jjile. On 1 date in June, 1, and free proglottides; on 2 dates in 

 October, 1, length 10 mm. on 1 date, 1 and a few fragments on the 

 other. 



RHINEBOTHRIUM FLEXILE Linton. 



1890, pp. 768-771 ; pi. 5, figs. 3-5. 



1900, p. 275. 



1901, p. 433. 

 1905, pp. 342, 347. 

 1908O, p. 167. 

 1910o, p. 695. 

 1911, p. 587. 



Kecords of this cestode not before published : 



Dasyhatis centrura. 



Collected in 6 of the years from 1903 to 1922, inclusive : On 1 date 

 in July, 3; on 2 dates in August, 1 on 1 date, 12 on the other, col- 

 lected by Dr. G. A, MacCallum; on 3 dates in September, 1 to 15. 



