HYMENOLEPIS LANCEOLATA 



231 



Zschokke reports the receipt of two specimens which a twelve- 

 year-old boy in Breslau evacuated spontaneously at two different 

 times. 



The corresponding cysticercoid, according 

 to Mrazek, lives in freshwater cyclops ; ac- 

 cording to Daday it is likewise found in 

 Diaptomus spinosus. 



[The synonymy of this species is as follows : 

 1727, Tcenia anserum, Frisch ; T. acutissima, 

 Pallas (vide Krabbe, 1867) ; T. anseris, 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. It occurs 

 in the following birds, Domesticated ducks 

 and geese, the Muscovy duck (Cairina mos- 

 chata), white-headed duck (Erismatura leuco- 

 cephala), the pochard (Ay thy a rufina), and 

 the flamingo (Ph&nicopterus antiquorum). It 

 has been recorded from Great Britain, France, 

 Denmark, Austria and Germany. F. V. T.] 



FIG. 159. Hymenolepis 

 lanceolata, natural size. 

 (After Goeze.) To the 

 right above, two hooks 

 are illustrated. 120/1. 

 (After Krabbe.) 



LITERATURE. 



BLOCK, M. E. Abhdlg. v. d. Erzg. d. Eingeweide- 



Wurmer, Berlin, 1782. 

 FEUEREISEN, J. Beitr. z. Kenntn. d. Taen. (Z. f. w. 



Z., 1868, xviii., p. 161.) 

 WOLFFHUGEL, K. Drep. lane. Bl. (C. f. B., P. u. I., 



1900 [i], xxviii., p. 49.) 

 ZSCHOKKE, F. Hym. lane. Bl. als Schmar. d. Menschen. 



(Ibid., 1902, xxxi., Orig., p. 331.) 

 MRAZEK, A. Zur Entw. einig. Taenien. (Sitzgsber. K. bohm. Ges. d. Wiss. Math. 



nat. Cl. Prag., 1896, Art. xxxviii.) 

 DADAY, E. v. Helm. Stud. Einige in Siissw.-Entomostr. leb. Cercocystis-Formen . 



(Zool. Jahrb. Syst., 1:900, Part xiv.) 



Gen. 5. Davainea, R. Blanch,, 1891. 



The scolex is more or less globular with a rostellum furnished with two 

 rings of hammer-shaped hooks ; the suckers are surrounded by several 

 rings of small booklets ; the genital pores are either on the same lateral 

 border or are irregularly alternating; ova, generally in egg capsules, are 

 usually present in large numbers, almost taking up the whole of the mature 

 segments. This genus occurs chiefly in birds. 



[The larval stage of the Davaineas takes place in slugs (Limax) and snails 

 (Helix). F. V. T.] 



