214 TAPEWORMS OF HARES AND RABBITS— STILES. vol.xix. 



Eg<^ with thin tiansparent shells; frei|uently in eyi;- capsules; in some cases 

 scattered through the segments; head nearly always armed with hooklets on 

 rostellum; larval stage a cysticercoid; adnlts in liirds and luannnals. 



IHpylidihKv (p. 193), 27 

 AnoplocephaVmw. ' 



5. Ova witli well developed pyriform hody; genital canals ])ass dorsally of longi- 



tudinal canals and main nerve trunk (not yet satisfactorily demonstrated for 

 Andrija) 



Ova witltoKt piirifurm hody; genital canals pass dorsalhj of ventral canal and ncrrc, 

 hut rentraUy of dorsal canal {not yet demonstrated for Stilesia centripunctata) . 10 



6. Uterus a transverse tube, generally continuous, in some of the double-pored 



forms divided (double), one tube for each ovary, and generally provided with 

 proximal and distal pouches; dorsal canal lies dorsal to dorso-lateral of ventral 



canals; pedunculated prostatic gland absent 7 



Uterus more like a network in its early stages; afterwards the boundaries of the 

 meshes nearly or quite disappear and the uterus (or uteri) appears like a sac. . 9 



' The genera of Anoplocephalinte may also be determined by the following key, which 

 although simpler than the one given above, is much more artificial : 



Anoplocephalhnr. 



A. Genital pores single B 



Genital i>ores double - F 



B. Genital pores unilateral or irregularly alternate with decided tendency to 



unilaterality C 



Genital pores regularly alternate or nearly so; pedunculate prostatic glands 

 absent D 



C. Pores unilateral ; testicles unilateral or nearly so in median field opposite pores; 



uterus transverse Avith proximal and distal pouches; pedunculate jirostatic 



gland absent Jnoplocephala, 1 1 



Pores irregularly alternate with decided tendency to unilaterality; litems forms 

 a network in its younger stage, later the meshes become nearly or quite 

 obliterated; testicles extend across the median iield to or beyond the ovary; 

 distinct pedunculated round or elongate prostatic gland jiresent. .. Andrya, 26 



D. Egg without pyriform body E. 



Egg with well-developed pyriform body; uterus transverse with tliiu-walled 



proximal and distal pouches; genital canals pass dorsally of dorsal and ventral 

 canals and main longitudinal nerve trunk licrtia, 11 



E. Uterus single and transverse, without pouches, or douhle, a cornucopia-like egg pouch 



hcing present near each ventral canal, the median transverse connecting canal nut 

 visible; genital canals piass dorsally of ncrrc and ventral canal, hut vcnivally of dor- 

 sal canal {not shown for S. centripunctata) ^tilcsin. 



Uterus transverse hut undulate, with thick-walled asconsjyore or cornucopia-like egg 

 pouches; genital canals jjass dornally of nerve and ventral canal, hut ventvally of 

 dorsal canal Thysanosoma. 



F. Egg without pyriform hody; uterus transverse and undulate, u-ith thick-wallcd ascou- 



spore or cornucopia-like egg pouches; genital ca)ials pass dorsally nf ventral canals 



and nerves, hut venirally of dorsal canal Thysanosoma. 



Egg with well- developed pyriform body; genital canals dorsally of ventral and 

 dorsal canals and nerves G 



G. Uterus a transverse tube, single or doiible, with thin-walled egg pouches; dorsal 



canal dorsal to dorso-lateral of ventral canal; vagina ventral of cirrus pouch 



on both sides of the segment CittoUvnia, 19 



Uterus reticulate, douhle; dorsal canal dorsal to dorso-median of ventval canal; vagina 

 ventral of right cirrus pouch, dorsal of left cirrus pouch Monie:ia. 



I 



i 



