NO. 1 105. PR CEEDINGS OF THE NA TTO KA L M VSE UM. 149 



rudimentary and not always evident (? or entirely absent) 5 genital 

 pores generally lateral ; uterus without special pore. 



Type genus. Tcenia, Linnaeus, 1758. 



All of the leporine cestodes known at present belong to the family 

 Tfieniidae, in which most authors place indiscriminately all tapeworms 

 provided with four cup-like suckers. Were this family subjected to 

 revision by any set of zoologists except helminthologists, it would 

 undoubtedly soon be raised to superfamily rank at least, and divided 

 into several families, subfamilies, and numerous genera. Most hel- 

 minthologists, however, are very conservative in proposing genera, 

 even when very prolific in establishing species! A superfamily Treni- 

 oidea3 will, I believe, soon be established, but this step it will be well 

 to postpone until the cestodes of birds are brought into better order. 



ANALYTICAL KEY TO THE GENERA OF ADULT TAPEWORMS FOUND IN LEPUS.* 



1. Head unarmed; genital pores single or double; ova with pyriform body. 



Anoploceplialince 2 



Head arrned with, numerous hooks on the rostelluin and suckers; genital pores 

 single; ova without pyriform body Davainea (p. 194.) 



2. Genital pores double; single pores a rare exception and then in strobilse contain- 



ing double pores Cittotcenia (p. 170.) 



Genital pores single 3 



3. Genital pores unilateral; testicles unilateral or nearly so, in portion of median 



field opposite pores ; uterus transverse with proximal and distal egg pouches; 



no separate and distinct prosfcatic gland present Anoplocepliala (p. 150.) 



Genital pores irregularly alternate; testicles extend across the median field to or 

 beyond the ovary ; uterus appears as a network or as a transverse tube with 

 egg pouches 4 



4. Separate and distinct prostata wanting ; uterus a transverse tube with proximal 



and distal egg pouches Bertia (p. 160.) 



Separate and distinct prostata present ; uterus reticulate ; genital pores show a 

 marked tendency to uiiilaterality Andrya (p. 154.) 



Subfamily ^IVOIPLOCEFHAJLIIS^E;, R. BlaneharcU 1891. 



Diagnosis. Tseniidre with unarmed head; genital pores lateral, 

 single or double; segments nearly always broader than long; uterus 

 transverse and tubular, or reticulate; ventral canals always well devel- 

 oped; dorsal canals generally less developed; ova generally with pyri- 

 form body; calcareous bodies present or absent. 



Type genus. Anoplocepliala^ E. Blanchard, 1848. 



Kiehm 2 in 1881 placed the three double -pored rabbit cestodes known 

 to him in the genera DipyUdium, R. Leuckart, and Cittotcenia^ Riehm, 

 and the single-pored forms in Tcenia; in his second 3 paper he placed 



!See also p. 213. 



1 See also p. 213. 



2 Zeitschr. ges. Naturw., 3 ser., VI, p. 200. 



3 Studien an Cestoden, Zeit. ges. Naturw., 3 ser., VI, pp. 545-610. 



