614 



I his species identical wiLli Ohapman's Taenia laiiiicol- 

 lis. In this hitter point MouLicelii is probably in 

 error, while as for the .i;eniis, it certainly rests npon 

 too weak characters to be recognized at present. The 

 ''anterior sucker" is, of course, the invaginated rostel- 

 lum and sac; the only valuable character remaining 

 is the single testicle. The bilobed dendritic ovary, 

 the form of the segments, etc., must all be rejected as 

 generic characters. 



The exact status of the genus and the ? one or ? 

 two species, (taurieo'llis and argentina) must be left 

 undecided for the present. 



( Genital pores alternate 2 



I Genital pores grenerally unilateral, 

 1. i occasionally alternate; rostelluna 



I with about 200 hooks 6 fJ^ long- D. tetragona, p. 619 



L Genital pores unilateral 4 



r Segments not over 5 in number; 



I strobila 1.5mm long or less; rostel- 

 2 J lum with about 80 hooks 7 /J- long-; 



j found in chickens D. progloltina, i).f)14 



I Seg-ments nuimerous, and strobila 



[ much longer than i.5mm 3 



f Rostellum with about 100 hooks 8 /J. 



I long; found in chickens and (?) 



I pigeons D. echinobothrida, p. 618 



3. -^ Rostellum with 208 hooks 7 fi to S fi 



long; found in chickens D. cesticillus, p. 617 



I Rostellum with about 80O hooks 11 fj. 



I long; found in quails D. circumvallata. p. 61 :i 



r Rostellum with 150 hooks 12.8 fi long; 



I found in pheasants D. Friedbergeri. p. 621 



4.'' Rostellum with ca. 60 hooks 11 fi 



I long; found in pjgeons and (?j 



L ducks D. crassula, p. 62;; 



a. Genital pores Irregularly alternate 



19. DAVAINEA PROGLOTTINA (Davaine, 1860) R. Blanchard. 1S91. 



(I860, Taenia proglottina Davaine; 1881, "T. proglottidina Dav." 

 of Plana.) 



[PI. XV, figs. 194-198; PI. XVI, figs. 199-202.") 

 Diagnosis: 0.5mm to 1.55mm long by O.lSmm to O.50mm bmad. 

 Head club shape to quadran.gular, 140 fi to 250 ft jrng by 135 /i to 

 200 fi broad, rather rounded in front and slightly consticted in 



