ISO TAPEWORMS OF HARES AND RABBITS STILES. VOL.XIX. 



Eiehm 1 in 188 L was the tirst to clearly define this form, which he 

 named Dipylid'nun- Icuckarti, with the following' specific diagnosis: 



Kopf hakeulos, sehr klein, etwa 0.5 mm. breit, mit 4 nachaufliegenden Sang- 

 napfen, nicht abgesetzt gegen den Hals, welcher mit lanzettformiger Verbreiterung 

 in die Gliederkette iibergeht. Geschlechtsoffnungeii beiderseits im hinteren Vier- 

 theil des Proglottisrandes. Glieder trapezforrnig, aueh im gestrecktesten Zustande 

 noch breit, fiir gewohnlich aber etwa 3-6 rnal breiter als lung. L-inge im ges- 

 treckten Zustande bis 80 cm., Breite der reifsten Glieder bis 1 em. Die Strobila 

 hliufig durch Liingsfalten der Haut wie gestreift. AVohiithier : Lepus cinriculu*. 



Iii the anatomical discussion, and in his figures, Eiehm brings out 

 the following points : 



The head measures 0.5 mm. broad by about 0.166 mm. thick; neck moderately long, 

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

 in the strobila ; posterior edge of segments extends prominently over the next follow- 

 ing segment, so that the side of strobila appears serrate. Male organs : Testicles 50 

 to 60 f.i in diameter, arranged in two groups in each segment, one on each side of the 

 median field near the ovary ; cirrus pouch small, sacular, contains a small vesicula 

 semiualis and the retracted and coiled penis. Female organs : The female anlageu 

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

 canal ; 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 the transverse canals in each 

 segment, but in 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 JLI in diameter. Of more than 150 wild rabbits, only 

 10 to 12 were not infested with this parasite. (Abstract.; 



Neumann 2 in 1888 placed the worm in the genus Tcenia; later" he 

 reverted to Dipylidium and recorded a worm from the domesticated rab 

 bit which he considered identical with this form. Eailliet in 1890 

 found this worm in France and proposed the name Tcenia ctenoides in 

 place of T. leuckarli (Eiehm, 1881), Neumann, 1888 [nee Krabbe, I860]. 



K. Blanchard 4 in 1891 placed this species in the genus ILoniezia, 

 translating Eiehm's diagnosis. 



Eailliet in 1893 transferred the species to his genus Ctenotcenia. 



I have examined one of Eiehm's originals, and, through the kindness 

 of E. Blauchard, I have received several tapeworms under the label 

 u Tcenia pectinata^ Lapin domestique, 10, 8, 89. G. Marclial. Hucque- 

 liers pres Montrei [?] sur mer." These worms agree with Eiehm's 

 specimens of Dipylidium leuckarti. One of Moniez's specimens labeled 

 "Azores" is also a D. leuckarti. Upon the material at my disposal and 

 Eiehm's anatomical discussion I base the following revised specific 

 diagnosis : 



. an Cestoden. Zeitschr. ges. Naturw., 3 ser., VI, p. 200; pp. 566-575. 

 2 Traite des maladies parasitaires, Paris, 1888, p. 426. 



3 Trait6 des maladies parasitaires, Paris, 2d ed., 1892, p. 461. Parasites and Parasitic 

 Diseases of Domesticated Animals, London, 1892, p. 473. 

 4 Mem. Soc. zool. France, IV, p. 187; pp. 450-451. 



