180 TAl'EWOUMS OF HARES ASD U A 11 11 ITS-STILES. 



Riehm' in 1881 was the first to dearly defiue this form, wliich he 

 naiiHMl DipijUdium leiickarti, with tlie foHowinu- specitic diajiiiosis: 



Kopf hakeulos, sehr klein, etwa 0.r> mm. bieit. mit I flachauiliegcn(lc.n Sang- 

 nHnfeu, nicht abgesct/.t gcgea den Hals, wcleher mit lauzettt7,rmi-er ^'erbreiternng 

 in die (Uiclerkctto iibergeht. Geschle.htsr.fVnungeu bei.lorseits ini binteren V ler- 

 theil des Proglottisrand.'S. Glieder trapezfoimig, auch ini gestrocktesten Znstande 

 nock breit, fiir o-.nvr.-bnlicb aber etwa 3-6 nial brciter als l:mg. Liinge iin gcs- 

 trecktmi zlistande bis 80 cm., Breite der reifsten Olied.r bis 1 <m. Die Strobila 

 hantig d..r.-h L.-iugsfalten der Haut wie gestreilt. Wohntbier : Lepus cn„ir„lus. 



Ill the anatomical discussion, and in his figures, Kiehm brings out 

 the foHowing i)oints : 



The head measiues O..". mm. broad by about O.IOC) mm. thick ; neck moderately h.iig, 

 its distal end nearly twice as broad as its proximal end ; 500 to 750 proglottids present 

 in the strobila; posterior edge of segments exten.ls prominently over the next follow- 

 in.-" se-ment, so that tho side of strobila appears serrate. Male organs : Testicles .,0 

 to'w /T in diameter, arranged in two groups in each segment, one on each side ot the 

 median held near the ovary ; cirrus ponch small, sacular, contains a small vesunla 

 seminalis and the retracted and coiled penis. Female organs: The female aulageu 

 appear as early as the twentv-fifth segment; female glands quite close to ventral 

 ranal ; uterus same as in C. pectinata. Excretory system : Circular canal said to be 

 absent from the head; a median canal forms a dorsal and a ventral loop between the 

 suckers; each loop branches, one forming the two ventral canals, the other the two 

 dorsal canals; the ventral canals are connected by tho transverse canals in each 

 scnnent, but iu the posterior segments a network of canals supplants the ordinary 

 transverse canals; a second canal system— evidently tho dorsal canals— is described 

 as possessing a thick muscular layer. It is figured as lying between the ventral 

 canal and nerve. Ova, 67 to 70 fi in diameter. Of nu.r.- than 150 wild rabbits, only 

 10 to I- were not infested with this parasite. (Abstract.; 



^"^eniiiann-' in 1888 placed the worm in the genus r<vnin : later" lie 

 reverted to DipyUdium and recorded a worm from the domesticated rab 

 bit which he consulered identical with this form. Railliet in I8!»(> 

 found this worm in France and proposed the name Ttvnia rtmoidrs in 

 place of r. Icurkarii (Riehm, 1881), Neumann, 1888 |nec Krabbe, ISOO]. 



\i. Blanchard' iu 1891 placed this species in the genus Moniezia, 

 trauslating Riehm's diagnosis. 



Railliet bi 1893 transferred the species to his genus Ctcnotaiiia. 



I have examined one of Rielmfs originals, and, throngli the kindness 

 of Iv. Blanchard. I have received several tapeworms under the label 

 ^^Tccniapcctinata, Lapin domesti(iue, 10, 8, 89. (1. :\Iaichal. Hnccpie- 

 liers pres Moutrei— [?] sur mer." These worms agree witli Kiehm's 

 specimens of PIpiiUdium IcKclnrti. One of Moniez's specimens labeled 

 ''Acores'^ is also a IK leuvho-ti. Upon the material at my disposal and 

 Rieiim's anatomical discussion I base the following levised specific 

 diagnosis : 



'Stud, an Cestodcn. Zeitschr. ges. Xatnrw., 3 ser., A'l, p. l'ih); ].p. .-.t;(;-575. 

 '^Traitt- des maladies ]»arasitaires, Paris, 1888, i>. 426. 



^Traitd des maladies parasitaires, Paris, 2.1 ed., 1802.,.. KU. I'arasiws an.l Parasitic 

 Diseases of Domesticated Animals, London. 1802, ]>. IT:.. 

 ' Miim. Soc. zool. Fraii.e, W, p. 187; pp. 150-151. 



