NEW TAPEWOEMS FKOM CARNIVORES SKINKER 217 



ing laterad beyond ovaries. Uterus with 10 to 15 lateral branches 

 on each side. Eggs 40/i, by 28/x. to 32/x. 



Hosts. — Definitive : Lynx fasciatus, L. f. fasclatus, L. rufus^ L. r. 

 calif ornims^ Lynx lynx (syn. Felis lynx)^ Canis lestes; intermediate: 

 Unkno^vn. 



Location. — Intestine of definitive host. 



Distribution. — Europe and United States (Washington and Cali- 

 fornia). 



Life Jmtory. — Unknown. 



Remarks, — This redescription is based upon U.S.N.M. no, 25317 

 and other specimens filed in the Zoological Division, Bureau of 

 Animal Industry. 



In several respects this species is similar to T. taeniaeforrmB., and 

 the two species have undoubtedly been confused ; in both species the 

 rostellum is relatively heavy and conspicuous, sometimes extended 

 to a length exceeding that of the scolex ; the suckers also are relatively 

 prominent and the hooks relatively large. Nevertheless, the two 

 species are readily separated, by even casual examination, on the 

 basis of the difference in the shape of the large hooks and the strik- 

 ing difference in the size of the strobila in mature specimens; the 

 guard of the hooks of T . taeniaeformis is much more prominent 

 than the guard of the large hooks of T. laticollis; the strobila of T. 

 taeniaeformis is usually much longer and wider than that of T. 

 laticollis. It is also probable that T. laticollis has been confused 

 with T. m,acrocystis; both species are relatively small cestodes and 

 both have relatively large hooks, but the hooks of T. m.acrocystis are 

 more numerous and the large hooks especially are quite unlike those 

 of T. 'laticollis in shape and size; the maximum length of the large 

 hooks of T. Tnacrocystis is less than the minimum length recorded 

 for those of T. laticollis. 



The size and shape of the hooks and the conspicuous vas deferens, 

 with its mass of coils usually extending to the median field of the 

 segment and curving somewhat anteriad, are the two most outstand- 

 ing characters for differentiation of this species from other members 

 of the genus. 



Hall (1919) gave a compilation (see table 1) of the descriptions 

 of T. laticollis from several authors, including Leuckart (1856). 

 Hall's compilation gave the large hooks as " ( ? ) 380 to 420ju, long " 

 and the small hooks as " 150 (?) to 183/i, long " ; Leuckart figured 

 them on the same scale as and in the same plate with T. crassicolUs 

 { = T. taeniaeformis) and described them as the same size as those 

 of Taenia crassicollis but slenderer and somewhat more curved 

 ("gerummt"). The large hooks of T. laticollis must then be con- 

 sidered recorded by Leuckart as 390ju, (the length recorded by him 



