618 ARTHTJE B. SHIPLEY. 



whose walls were strengthened by a series of cuticular-looking 

 rings, whose cut ends are shown in figs. 4 and 6. This com- 

 municates both with the oviduct and with the uterus. The 

 latter presents no special points of interest; in the posterior 

 segments it contains the typical three-hooked larvae, each 

 segment containing at least one hundred and probably more. 



Systematic. 



In his paper on tsenias in birds, Dr. Fuhrmann^ remarks 

 that of the 240 odd species of tapeworm described from avian 

 hosts, only twenty-one have been studied anatomically ; the 

 remainder are but little more than names, and probably many 

 of the names are of doubtful validity. 



A certain amount of order has been introduced into this mass 

 of material by the establishment of certain sub-groups^ and by 

 the giving of a new generic name to the members of these sub- 

 divisions; thus in 1891 Blanchard and Railliet- established the 

 genus Davainea; in 1892 Railliet^ suggested two new generic 

 names, Drepanidot^enia and Dicranotsenia, for certain 

 tapeworms inhabiting, for the most part, domestic birds. 

 These are characterised chiefly by the nature of the hooks. 

 In the following year Diamare* founded the genus Cotugnia, 

 in which the generative organs are double and have two 

 pores, but which is distinct from the genus Dipylidium 

 of Leuckart. All these genera are characteristic avian 

 tapeworms, and are, with but very few exceptions, confined to 

 birds. 



There is little doubt that the tapeworm which I have 

 described above from the intestine of Hemignathus pro- 

 cerus corresponds with a Drepanidotsenia of Eailliet,^ who 

 defines his genus as follows : 



" Tapeworms provided with a simple crown of uniform hooks, 



1 ' Rev. Suisse Zool.,' tome iii, 1895-6, p. 433. 



2 ' Mem. Soc. Zool. France,' tome iv, 1891, p. 420. 



3 Ibid., tome xvii, 1892, p. 115. 



* 'Boll. Soc. Napoli,' ser. 1, vol. vii, 1893, p. 9. 



* ' Traite de Zoologie medicale et agricole,' Paris, 1895, p. 298. 



