597 



Genus DREPANIDOTAENIA Rallllet, 1892. 



Diagnosis: Head provided with a single row of uniform hooks, 

 few (8-20) in number, with dorsal root much longer than ventral 

 root, the latter always small; with prong directed posteriorly 

 when the rostellum contracts. Type species Dr. lanceolata 

 (Bloch, 1782) Railliet 1892. 



Development: The larval stage (cysticercaid) of several 

 species has been found in small crustaceans. 



f Genital pot'es alternate; rositellum 



I with 16-20 hooks 20-27 // long; 

 1. •^ Hab: chickens, ? pheasants, 



I ? ducks, pigeons Dr. infundibuliformis. p. 609 



I Genital pores unilateral 2 



2 < Rostellum with 10 hooks .? 



'( Rostellum with 8 hooks 4 



Hooks 20 fi to 23 fi long; found in 

 ducks, domestic goose, and wild 



3^ goosander Dr. tenuirostris, p. 60R 



Hooks 35 // to 40 /« long; found in geese.. Dr. setigera, p. 605 

 Hooks 51 /i to 61 ft long; found in geese. ..Dr. sinuosa, p. 604 

 Hooks 65 ft to 72 fi long; found in ducks.. Dr. anatina. p. 601 



f 



Hooks 31 fi to So fi long; found in ducks 



and geese Dr. lanceolata, p. 597 



^- \ Hooks 57 fi long; found in geese Dr. fasciata, p. 598 



j Hooks 77 /z to SO « long; found in ducks 



'^ and geese Dr. gracilis, p. 600 



A. Genital pore unilateral. 



a. Rcstellum with 8 hooks. 



10. DREPANIDOTAENIA LANCEOLATA (Bloch, 1782) Rallllet, 1892. The 

 lanceolate tapeworm. 



(1727, Taenia anserum Frisch— vide Rud., 1810; 1781, T. aeutis- 

 sima Pallas, pars— vide Krabbe, 1869; 1779, T. anservis Bloch 

 —vide Rud., 1810; 1782, T. lanceolata Bloch; 1786, T. lanceola 

 Batsch— vide Rud., 1810; 1803, Halysis lanceolata (Bloch, 1782) 

 Zeder— vide Rud., 1810; 1858, Hymenolepis (Dilepis) lanceolata 

 (Bloch, 1782) Weinland.) 



[PI. IV, Figs. 43-53; PI. V, Figs. 54-55.1 



Diagnosis: 30nim to 130mm long by 5nim to ISmm broad. Head 

 very small, globular; rostellum cylindrical, slightly swollen on 

 the summit, armed with a single crown of 8 hooks 31 ft to 35 /* 

 long: suckers rounded. Neck very short, can be retracted with 

 the head into the anterior portion of the strobila. Anterior 

 segments very short, the following segments increasing slightly 



