216 TAPE WORMS OF HAEES AND EA BEITS- STILES. 



Inertia. 



14. Hosts: Rodents; 1 cirrus pouch distinctly muscular, prominent, with vesicula 



seminalis; receptaculum seminis round and prominent; pores very regularly 



alternate ; calcareous corpuscles present or absent 15 



Hosts: Primates and lemurs; 1 cirrus pouch? ; calcareous corpuscles present 16 



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



posterior segments show a tendency to Itecome narrow and thick; strobila attains 33 

 mm. in length by 6 mm. in breadth, and contains about 90 segments, calcareous cor- 

 puscles not observed. Host: Yellow-haired porcupine (Erethizoii epixanthus) and 



Canada porcupine (E. dorsatus), North America IS. americana (p. 165) 



Genital pores in about the middle of the lateral margin ; cirrus pouch about 0.4 mm. 

 long ; posterior segments do not become narrow ; strobila attains 23 to 47 mm. in 

 length by 5 to 6.5 mm. in breadth, and contains 60 to 95 segments; calcareous 

 corpuscles present. Host: Rabbit (Lepus, sp. ?), North America. 



B. americanaleporis (p. 167). 



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



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

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

 pouches 17 



Cirrus pouch very muscular; receptaculum seminis elongate; pores irregularly alter- 

 nate; ovary extends to aporose portion of median field; uterus transverse with prox- 

 imal and distal pouches; strobila 24 to 220mm. long by 5 to 11 mm. broad, and con- 

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



B. plattica (p. 164). 



Cirrus pouch? vesicula seminalis?; uterus composed of 30 to 35 polyhedral packages. 18 



17. Strobila attains 140 mm. or more in length by 8 to 10 mm. in breadth. Host: Black 



howler ( Alouatta caraya), Paraguay B. mucronafa (p. 162). 



Strobila attains 84 mm. or more in length by 6.5 mm in breadth. Host: Bonnet mon- 

 key (Macacus siuicus), India B. conferta (p. 163). 



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



tal pore alternates very regularly; ova 53 to 60 //. Host: Chimpanzee (Aiithropo- 



pithecus troglodytes) B. studeri (p. 161). 



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

 ness; pores irregularly alternate; cirrus pouch claviform; ova 35 to 38 /< by 30 to 

 32ju. Host: Oran-utau . (Simia satyrus) B. satyri (p. 161). 



Cittotainia. 



19. Cirrus pouch muscular, generally pyriform, with distinct outline, and swollen 



proximally by the vesicula serainalis Marmota>-Group, 20 



Cirrus pouch tubular, resembling the nozzle of a hose, of equal or nearly 

 equal diameter throughout its entire length, and not swollen proximally by 

 any prominent vesicula seminalis Pectinata-Group, 23 



20. Testicles arranged in a band extending across the median field 21 



Testicles comparatively few in number, absent from median line, arranged in two 



triangular groups, 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 dorsal or 

 dorso-lateral of ventral canal; strobila attains 80 cm. in length by 10 mm. in 

 breadth. Host: Common wild and tame rabbits (Lepus cuniculus and L. cnui- 

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



21. Testicles not confined 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 mm. broad, crosses the canals ; female glands some distance from 



1 Characters satisfactory for an analytical key are still lacking. 



