TiENTOTD CESTODES OF NORTH AMERICAN BIRDS. 69 



DAVAINEA VOLZI " Fuhrmann, 1905. 



For description see Fuhemann, 1905b, iti). 303-308, i»l. 10, fiys. 1-7. 



Host, — Gallus gallus domssticus. 



Genus POROGYNIA & Railliet and Henry, 1909. 



Linstotvia Zschokke, 189S (iu part; see Fuhrmann, 1907a, p. 293). 

 Polyccelia Fuhemann, 1907 (liomouymons with PohjcceUa King, 1849, 

 Ccelenterata ) . 



Generic diagnosis. — Davaineinse: Scolex with simple rostellum, 

 armed with three rows of hooks. Segments much broader than long. 

 Cortical parenchyma and longitudinal musculature greatly developed. 

 Dorsal excretory vessels absent. A single set of reproductive organs 

 in each segment. Genital pores unilateraL Genital canals pass dorsal 

 of the longitudinal ventral excretory vessel and nerve. Testicles 

 numerous. Female glands on the pore side of the median line, near 

 the ventral excretory vessel. Yolk gland between the ovary and me- 

 dian line. Uterus with very thin walls, which early disappear. The 

 eggs become inclosed singly in Qgg capsules, closely packed together 

 filling the medullary parenchyma. Adults in birds. 



Type-S'pecies. — Porogynia lata (Fuhrmann, 1901). 



Genus COTUGNIA Diamare, 1893. 



Generic diagnosis. — Davaineinse: Segments broader than long. 

 Several layers of longitudinal muscles alternating with layers of 

 transverse muscle fibers. A double set of reproductive organs in each 

 segment, close to the longitudinal excretory canals. Genital canals 

 pass dorsal of longitudinal excretory vessels and nerve. Testicles 

 numerous, filling the median field and extending dorsal of the female 

 organs and excretory vessels to the extreme edge of the medullary 

 parenchyma. Uterus breaks down, and the eggs become inclosed 

 singly in egg capsules. Adults in birds. 



Type-S'pecies. — Cotugnia digonopora (Pasquale, 1890) Diamare, 

 1893. 



COTUGNIA DIGONOPORA (Pasquale, 1890) Diamare, 1893. 



For description see Stiles, 1896f, p. 80, pi. 1, figs. 1-11. 

 Host. — Gallus gallus domesticus. 



« This species is very similar to and perhaps identical with Dnvainea ecMno- 

 bothrida. 



* Fuhrmann (1907a) placed the genus PolycoBUa{=Porogijnia) in the subfamily 

 Dipylidiinse, but more recently (190Sa, p. 47) in the light of later knowledge 

 concerning the anatomy of its type-species has transferred it to the subfamily 

 Davaineinse. 



