216 TAPEWORMS OF HARES AND RABBITS- STILES. 



lieriia. 



14. Hosts: Rodents;' cirrris pouch distinctly nmsciilar, prominent, with vesionla 



seminulis; receptaculum seminis round and prominent; poros very regularly 



alternate; calcareous corpuscles present or absent 15 



Hostn: Pnmairs andlemurs;^ cirrus poitchf; calcareom corpusdea prentnt.. . 16 



15. Genital pores in posterior half of lateral margin; eirnis pouch about 0.5 mm. long; 



posterior segments show a tendenrg to become narrow and thick; strobila attains .)3 

 nun. in length hg G mm. in breadth, and contains about !>0 segments, calcareoui cor- 

 puscles not observed. Host: Yellow-haired porcupine (VA-cihi/jm e\ti\iint]wis) and 



Canada porcupine (E. dorsatus), Xorth America /•'. americaua (]). lt»5) 



Genital ])orcs in about the middle of the littoral margin ; cirrus pouch about 0.4 mm. 

 lung; ])osterior segments do not become nnrrow ; strobila attains 21^ to 17 mm. in 

 length by 5 to (i ."> mm. in breadth, and contains 60 to 0.5 segments; calcareous 

 coi])us(des ])resent. Host: Rabbit (l.e/ins, sp. ?), North America. 



II. americanaleporis (p. 167). 



16. Cirrus pouch not so prominent as vagina, and with but weal; musculature; receptacu- 



lum seminis round to elongate and not very prominent; pores irregularig alternate; 

 orary confined to pore side of median field; uterus transverse with proximal and distal 

 pouches 17 



Cirrus 2>onch very muscular; recejytaculum seminis elongate; pores irregularly alter- 

 nate; ovary ertends to aporose portion of median field; uterus transverse ivith firor- 

 imal and distal pouches; strobila 24 to 220 mm. long by .7 to 11 mm. broad, and con- 

 tains SO to 400 segments. Host: Flying lemur (Galeopithecus volans), India. 



/»'. plaslica Cp. 161). 



Cirrus pouch ? resicula seminalis ?; uterus composed of SO to 3') polyhedral packages. 18 



17. Strobila attains 140 mm. or more in length by S to 10 m)n. in breadth. Host: Jilack 



/(f)!('/cr (Alouatta caraya), Paraguay I!, mucronata {\\. 162). 



Strobil<( attains S4 >«?«. or more in length by >:..'/ mm in bnadlh. Host: Uonnet mon- 

 key ( Macacus sinicus), India />'. conferta (p. 163) . 



18. Strobila attains 130 mm. in length by 15 mm. in breadth by 2.5 mm. in thickness; geni- 



tal })ore alternates t^ery regularly; ova 53 to 60//. Host: Chimpanzee {.\.nt\\vo\w- 



pithecus troglodytes) /.'. sluderi (p. 161 ). 



Strobila attains 245 mm. or more in length by 10 mm. in breadlh by 2 mm. iti thick- 

 ness; 2>ore8 irregularly alternate; cirrus jioucli chiriform: ova 35 to 3S /i by 30 to 

 33/1. Host: Oran-ufan (Simla satyrus) I>. salyri (]). 161). 



Cittotirnia. 



19. Cirrus ])ouch muscular, generally pyriforni. wltii distinct outline, and s\Yollen 



proximally by the vesicula seminalis Marniota'-Groui», 20 



Cirrus ])ouch tubular, reseml)ling the nozzle of a liosc, of eijual or nearly 

 equal diameter throughout Its entire length, and not swollen ])roximally by 

 any prominent vesicula seminalis Pcctlnata-tiroup, 23 



20. Testicles arranged in a l)and exteuding across the median field 21 



Testicles com]>;iratively few in number, absent from median line, arranged in two 



triangular gron]ts, one corresponding to each ovary; cirrus pouch small, 

 0.16 mm. long, scarcely reaching the longitudinal nerve: pores in distal part 

 of lateral margin; female glands near ventral canal; dorsal canal dor.sal or 

 dorso-lateraldf ventral canal; strobila attains 80 cm. in length by 10 mna. in 

 breadth. Host: Common wild and tame rabbits {Lepus cuniculus and L. cuni- 

 culus domesticus), Europe C. cfenoides (p. 179). 



21. Testicles not contined to space between the ovaries 22 



Testicles confined to distal portion of segment between oraries; cirrus pouch about 0.5 



mm. long by 0.17 nun. broad, crosses the canals ; female glands some distance from 



' Charactera satisfactory for an analytical key are still lacking. 



