c Genital pores unllaleral. 



24. DAVAINEA FRIEDBERGERI (von Unstow. 1878) R. Blanchaid, 1891. 



(1878, Taenia Fiiedbergeri von Llnstow [May 16]; ? 1878. Taenia 

 agama Megnin [August]; ? 1878, T. infundibulifoiimis vai. 

 phasianorum Megnin [September]; 18S8, T. cestieillus var. 

 phasianorum Neumann.) 



[PI. XVIII, figs. 236-242.-| 



Diagnosis: trobila up to 200nim and more long by 2niro to Smm 

 wide. Head pyriforra, 0.3S6nun broad by 0.30mni long; rostellum 

 armed -with a double row of hooks, 75 in each row, 12 a long; 

 suckers elliptical, armed with 4-5 rows of hooks, of which those 

 on the middle row are smallest. Neck thin, 2nini to 3mm long. 

 Anterior segments very short, the following gradually increa.se 

 in length, the distal borders projecting so as to give a serrate 

 appearance to the worm; in the posterior sixth the segments 

 become moniliform, the last segments almost globular, fre- 

 quently orange in color. Genital pores unilateral, in middle of 

 the margin. Oa. 34 n to 38 ji, onccspheric hooks 6.5 ft. 



Development: Unknown; Friedberger and Megnin think that 

 ants ("Formica rufa?") form the intermediate host, hut ex- 

 periments (Friedberger) were negative. 



Hosts: Pheasants (Phasianus colchicus). 



Geographical distribution: Germany and France. 



Epidemics: Friedberger (1877, pp. 99-112) gives quite 

 iiu extensive account of an outbrealc of disease among 

 |)lieiisnnts which he attributed to the presence of the 

 large number of tapeworms. A remarkable difference 

 in the development of the young pheasjints was 

 noticed. .Many of them became sick. The appetite 

 remained good for the most part, but the animals grew 

 dull and their feathers became ruffled. Suddenly the 

 animals would wake up. run around, and take food; 

 then they would quiet down again, close their eyes, and 

 finally die. 



Several post-mortems weie made, and in all cases 

 numerous tapeworms were found in the intestine. A 



