NO. 1105. PROCEEDINGS OF THE NATIONAL MUSEUM. 187 



longitiulinal canals ; the cirrus jioucli is deserving of special notice. In tlie majority 

 of the known T;pnii(l;e the cirrus pouch is pyriforni and rarely extends median of 

 the ^'entral canal, but in C. pect'tnata it is a long narrow structure reminding one 

 of the nozzle of a hose; liiehm gives its average length as more than 1 mm., and on 

 Plate VI, fig. 4, shows that it is luore than twice as long as the distance between the 

 genital pore and the longitudinal canal. This extreme length of the pouch is a 

 character of great importance. Female organs: The vagina, according to Riehm, is 

 about as large as the cirrus pouch. At a point corresponding to the proximal end 

 of the cirrus pouch it becomes suddenly very thin, and leads to a second swelling, 

 the receptaculum seminis. The female glands correspond in all essential cliaracters 

 to those of the genus Moniezia, except that the ovary is <lescribed as composed of 

 two quite distinct halves. Their position, some distance from the longitudinal 

 canals, is striking. The uterus is said to bo similar to that of ('. cUnoldex, namely 

 "a common uterus for both sides, Avhich extends the entire breadth of the seguieu, 

 and is constricted only in the middle, so that in the gravid segments the lateral 

 portion appears swollen by the ova in comparison with the rather thin median 

 portion. Its volume is also considerably increased laterally [namely, laterally to 

 the uterus, longitudinal in reference to the worm] by apparently nubrauched tubes 

 which extend anteriorly and posteriorlj\ As a matter of fact, however, these tubes 

 resolve themselves as the optical sections of a corresponding number of circular 

 wideuings of the uterus."' Excretory system: The dorsal canals become obliterated 

 some distance from the head. The transverse canals are connected with one another, 

 not only by the ventral canals, but also by numerous smaller longitudinal canals. 

 Topographically, Riehm figures the genital canals as dorsal of the nerve and longi- 

 tudinal (ventral) canal. The parasite is said to occur only in the fall and first half 

 of the winter, and only in hares. It was especially common around the Riibliuger 

 See, but rare on the higher plateaux of Saxony. 



BlaiK'liaid' iu 1891 states that lie fouiul this sjiecies in several linres 

 of mikiiowii origin. He lias never fonnd it iu liares in the central part 

 of France or around Paris, but found four specimens at Briaucon in 

 LepuH variahiUs, killed at a lieight of 1,500 meters. His description, 

 based upon these specimens, may be summarized as follows: 



The largest specimen was 18 cm. long ; maximum breadth, 7 to 10 mm. ; head 315 to 

 o40/< broad; neck, 285 to 325// broad; in contracted specimens the neck may measure 

 1 nun. broad at the first segment; suckers elliptical, 142 jii long by 135 jn broad; 

 opening, 80 // long by 53 // broad ; mature segments, 7 to 10 mm. broad by 1.1 to 2 mm. 

 long; penis smooth, 40 to 45 /i in diameter, extrudes 175 to 200 /< from pore; eggs 

 general!}' polygonal from reciprocal pressure, but become elliptical or subspherical 

 when i^ressure is removed ; 80 to 90 // by al>out 75 // ; outer membrane 1 to 2 // thick ; 

 diameter of bulb of jiyriforra body 25 to 30 /< ; length 40 to 50 jn ; horns terminate in 

 a long filament; hooks of oncosphere 8 //. 



Railliet'^ in 1893 places this species i)i his genus Ctenot(vma. 



Througli tlie kindness of Dr. Brandes, I have obtained one of Riehm's 

 original specimens of DipyJUlhnn pectinatum for comparison \vith the 

 American forms, and Blancliard has placed his forms from L. variabilu 

 at ni}^ disposal. In my private colle:'tion I tind several specimens <»t 

 tapeworms from Lepus timidiis which I collected in Leipzig iu 1890, and 

 which agree perfectly with Eiehm"s form. With this material at hand, 

 together with one specimen from von Linstow and several from Moniez. 



'Mem. Soc. zool. France, IV. i)i). 44.5. 452, 457-460, fiijs. CG-SO. 

 ^Traite Zool. med. et agric., I. ])[(. 278-279. 



