18 
Tapeworms from Ostrich 
KEY TO SPECIES OF DAVAINEA— continued. 
Rostellar hooks 14 p long, egg-capsules extending 
laterally to excretory vessels . ... D. clavicirrosa Fuhr. 
?. D. gracilis Jan. 
+ D. cantaniana Polonio and D. blanchardi Parona here. 
+ + 
+ + + 
D. capillaris Fuhr., D. penetrans Baez. here. 
D. circumvallata (Krabbe)—when young—and 
D. 
echinobothrida (Megnin)— 
+ + + + 
+ + + + + 
1. 
when with unilateral genital pores—here. 
D. cohni Baez. 
D. insignis Steud., D. urogalli (Modeer). 
Ba. 
Proglottides less than 10. 
• ■ (2) 
Proglottides numerous. 
. • (5) 
2. 
Testes 4. 
D. himantopodis John. 
Testes 10 or more. 
. • (3) 
3. 
Testes lateral or anterior. 
D. varians Sweet 
Testes in a double row along posterior margin of proglottis (4) 
4. 
Rostellar hooks 60, 7-8 p long .... 
D. dubius Meggitt 
Rostellar hooks 80-95, 5-7 ‘5p long . 
D. proglottina (Dav.) 
5. 
Cirrus-sac not reaching excretory vessel 
. . (6) 
Cirrus-sac reaching or passing excretory vessel 
. • (8) 
6. 
Egg-capsules contain one egg .... 
D. polycalceola Jan. 
Egg-capsules contain several eggs . 
. . (7) 
7. 
Female organs in poral half of proglottis 
D. leptotrachela Hung. 
Female organs in centre of proglottis 
(7a) 
7 a. 
Testes 20-30 . 
Testes 10-15. 
8. 
Rostellar hooks 8p or less. 
. . (9) 
Rostellar hooks lip or more .... 
. . (10) 
9. 
Suckers armed with 3 rows of hooks 
D. hertwigi Mola. 
Suckers armed with 6-8 rows of hooks . 
D. pluriuncinata Crety 
10. 
Genital pore anterior, in birds .... 
D. retusa Clerc. 
Genital pore anterior, in birds .... 
D. hertwigi Mola. 
Genital pore posterior, in rodents . 
D. salmoni Stiles 
1. 
Ab. 
Proglottides 5. 
Proglottides numerous. 
. . (2) 
2. 
A wavy line of accessory hooks present . 
D. echinata Fuhr. 
Accessory hooks absent. 
(2a) 
2a. 
Rostellar hooks thorn-shaped .... 
D. formosana Akashi. 
+ 
Rostellar hooks T-shaped ..... 
. . (3) 
3. 
Eggs singly in parenchyma .... 
. . (4) 
Egg-capsules contain several eggs . 
• • (5) 
4. 
Rostellar hooks 14-16/x long .... 
D. longispina Fuhr. 
Rostellar hooks 20-30/z long .... 
D. struihionis (Par.) 
Rostellar hooks 25-28p long .... 
D. undidata Fuhr. 
