212 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



of T. laticollis are measured according to the scheme referred to 

 above as the one believed to be in general use. All these terms used 

 in discussions of hooks invite criticism, especially such a name as 

 " dorsal edge ", for hooks cannot accurately be said to have a '' dor- 

 sal " edge, but these terms are retained in preference to introducing a 

 new terminology. 



TAENIA LYNCIS, new species 



Plate 19, Figures 2-5 ; Plate 20, Figures 1-4 



Speci-fiG diagnosis. — Length up to about 64 cm, maximum width 

 11 mm. Genital papillae inconspicuous, located approximately in 

 middle of lateral margin of segment. Overlapping of segments not 

 pronounced. Mature segments comparatively few, usually 10 to 15; 

 gravid segments constituting more than half of length of strobila, 

 Neck usually short ; segmentation usually beginning 540)U. to 1.4 mm 

 posterior to suckers. Scolex usually wider than first segments, 620/x 

 to 1 mm wide; suckers conspicuous, round, or slightly oblong with 

 greater diameter in anteroposterior direction, 165;u, to 205ju, in di- 

 ameter; rostellum 250/x to 400/a in diameter, armed with double crown 

 of 36 to 46 hooks, rostellum sometimes protruding to an extent one 

 and a half times as long as remainder of scolex. Large hooks 220/* to 

 258/>i long (pi. 19, fig. 6) ; handle IIO/a to 151/i long, widest portion 

 at distal end; guard conspicuous, 55/a to 70/x long; blade 79/x to 85/i 

 long. Small hooks 159/x to 208|a long; guard distinctly bifid (pi. 19, 

 fig. 3), 43/A to 63;u long; handle 79|U, to 122/a long; blade 61/* to T3/x 

 long. Nerve cord about 6OO/1, from lateral margin of segment ; ventral 

 longitudinal canal 700/* to 8OO/1 from lateral margin of segment; 

 posterior transverse canal conspicuous. Calcareous corpuscles spheri- 

 cal or ovoid, about 22/t in greater diameter. 



Type specimen 23 cm long; maximum width 4.5 mm; about 236 

 segments; all segments wider than long; terminal gravid segments 

 about 2.75 mm long, 3.5 mm wide. Segmentation apparent 750/* to 

 1 mm posterior to suckers; genital primordia visible in about fif- 

 teenth segment. The strobilae of various specimens vary widely 

 in general appearance; in the type and a paratype (U.S.N.M. no. 

 28482) the strobila is thin; in some other paratypes (U.S.N.M. no. 

 26886) it is uniformly much wider and thicker, and would thus 

 suggest that it is a distinct species, but the hooks and the anatomy 

 of the mature segment check satisfactorily with the type specimen. 

 The mature segments illustrated in plate 20, figure 3, are from a 

 worm about 60 cm long from Felis concolor hippoJestes and are quite 

 unlike those of the type specimen in other ways than in the size of 

 the strobilae (that is, in the shape and size of the ovary and vitel- 



