62 
FIg. 106. — Segment of Dararnca tctragona of chickens, enlarged to show the reproductive organs. 
(After Ransom, 1904. t?7 . fig. .7. 
Fig. 106.— Gravid segment of Davainea salmoni of the cottontail rabbit, enlarged dorsal view showing 
longitudinal nerves and .-inals :-:rrus p: net. vagina and mun;: :>as gg i-apenles. After Sales. 
1896, pL 22, fig. 4. 
Genus DAVAINEA Blanchard <Sc Railliet, 1C91. 
Generic diagnosis. — -D-ivaineinee ( p. 60 : Seolex with a rostellum armed with 
numerous hammer-sLar-e 1 h : . klets. arrange I in tw>: rows. Suckers with several 
Tings of small booklets. Genital pores usually unilateral, less frequently irregularly 
alternate. Eggs in egg capsules, in nearly the entire middle field of the segments. 
Parasitic in mammals an 1 birds. Larval i >nn a eysticercoid in mollusks and 
arthropods. 
Type species.— If ^ •cb :g' .: Davaine, 1869 . 
The two species of thh genus reported for man (neither of them 
known yet for North America may be distinguish^ 1 ' y the following 
key: 
Testicles 50 or more in each segment; 300 to 400 egg halls in each gravid segment; 
calcareous corpuscles present I), madagascariensis (p. 63) 
TeMicles 14 to 15 on each transverse section , arranged in single ventral and dorsal 
rotes; 60 to 80 egg halls in each gravid segment; calcareous corpuscles absent 
D. asiatica (p. 65 
® Synonym. — ? Inga Weinland. 1857. type, punctata; ?? Chapmania Monticelli, 1S93, 
type Tania argentina. In case of a division of the genus Davainea , the species reported 
lor man will not remain in Davainea s. str. 
