NOTES ON CALYPTROBOTHRIUM, A CESTODE (iENUS 

 FOUND IN THE TORPEDO. 



By Edwin Linton. 



Of Wnshiiigton (tiid Jeff'erxoii College, iVasli'mgton, ]'eruisiilr<i)i!a. 



The genus Cdhjpfroludln'huii^ established )»y jNIontic-elli" l)elongs to 

 the faiiiil}' Tetrabothriida' and is near the genus JlonorijgnKi. 



The scolex is provided with four tlexibh^ unarmed bothria and each 

 bothriuni with a singh> large horseshoe-sha])ed sucker. 



In 1S09'' I descril)ed a species of CalyjifrohotJirhnii under the name 

 O. occidental r. This description was based on one large and eight 

 small specimens collected from the iov\)oAo {7\'f rand rcc oceaient<(( is). 

 No mature segments were found, and, although the large specimen 

 was regarded by me at the time of collecting as a diti'erent species 

 from the small specimens, a study of the preserved material did not 

 appear to justify placing them in distinct species. 



During the summer of 1!>05, I had the opportunity of examining a 

 considerable number of these cestodes, and, linding the two kinds, in 

 some cases associated together, in others separate, moreover with ripe 

 segments, which vvei'e proved to belong to the small variet}^ it became, 

 evident that the two sizes represented different species. 



The name Cdlyptrohothrin.m occidentale is retained for the larger 

 variety of the original description and the name C. minus is proposed 

 for the smaller variety. 



The following account is leased on material collected at the labora- 

 tory of the Bureau of Fisheries, Woods Hole, Massachussetts, in Jul}^ 

 and August, 1905. The torpedoes were taken at Menemsha Bight, 

 Vineyard Sound. Some of them were brought to Woods Hole alive; 

 others were opened when taken and the viscera placed in formalin. 



"Naturaligta Sieiliano, An. xii, 1893, p. 15 of Author'n separate, pi. i, figs. 1-4. 

 ''Bull. U. S. Fish. Coiuin. for 1S99, p. 298. 



Proceedings U. S. National Museum, Vol. XXXII~No. 1529. 



275 



