PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued kmi\\^ \j'^M>'l ^H '^* 



SMITHSONIAN INSTITUTION 



U.S. NATIONAL MUSEUM 



Vol. 83 Washington : 1935 No. 2980 



TWO NEW SPECIES OF TAPEWORMS FROM CARNIVORES 

 AND A REDESCRIPTION OF TAENIA LATICOLLIS 

 RUDOLPHI, 1819 



By Mary Scott Skinker 

 Zoological Division, Bureau of Animal Industry, United, States Department 



of Agriculture 



In studying a collection of cestodes from carnivores in North 

 America, I found two species with characters sufficiently distinc- 

 tive to necessitate considering them new. 



A review of specific characters develops the fact that hook sizes 

 as given in the literature are not necessarily comparable things. 

 No scheme for measuring hooks appears to be generally accepted by 

 the various writers on cestodes, but in this paper I assume, where no 

 scheme such as Meggitt's (1927, p. 420) is presented, that the 

 length of the entire hook is the distance, in a straight line, from 

 tip to tip; that the length of the blade is the distance, in a straight 

 line, from the tip of the blade to the tip of the guard ; and that the 

 length of the handle is the distance, in a straight line, from the tip 

 of the handle to the tip of the guard. The length of the guard 

 is perhaps usually considered the distance from the tip of the 

 guard to the dorsal edge of the hook. In this paper the different 

 types of hooks have made it advisable to use more than one scheme 

 for measurement. The scheme used for Taenia lyncis is repre- 

 sented in plate 19, figure 4. AB represents length of hook, DB length 

 of blade, AC length of handle, and EF length of guard. This scheme 

 is also followed in measuring the hooks of T. taxidiensis. The hooks 



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