TYPES OF SPKCIKS OF CESTODA — KREFFT. 19 



Systematic. — There appear to be only four other species of 

 Diorchis known ;i<J * viz. D. inflata, Rud., D. parviceps, Li:ist., 

 D. acuminata, Clerc, and I), americana, Ransom. The first, 

 third and fourth occur in Ralliform birds, the second, and perhaps 

 also the third, in An serif orm birds. D. flavescens is also a para! ite 

 of the latter group of birds. It appears to come very 



near D. americana 4,0 . D. parviceps, Linst. 41 from Mergus 

 ( = Merganser) serrator, differs considerably in regard to the 

 rostellar armature and the male ducts. D. inflata 4,2 and D. 

 acuminata 13 are very closely allied and perhaps identical, 

 species differing from Krefft's form mainly in regard to tlie 

 characters of the cirrus and its sac. It should be mentioned 

 that Clerc found D. acuminata in a Rail, Fulica atra (in which 

 D. inflata is also found) as well as in three Anseriform birds, 

 Anas ( = Nettion) crecca, A. ( = Chaulelasmus) strepera and 

 Mareca pen elope. Fulirmann 44 thought that the identification 

 of the Diorchis from the Rail with that from the various ducks 

 was probably a mistake, consequently he queried the occurrence 

 of D. acuminatain Fulica atra. Ransom 45 however showed that 

 this Cestode occurs in another Rail (Fulica americana) in 

 company with D. americana. It seems to me still possible that 

 Clerc had before him two species of Diorchis, namely, D. 

 acuminata (or D. inflata) from Fulica atra and another species, 

 very similar in anatomy and which might well have been D. 

 flavescens, from the Anseriform hirds. 



39 * Diorchis ocdusa, Linst. (Linstow — Spolia Zeylanica, in., 1905, p. 179) 

 from a Flamingo is not a Diorchis but is a Hymenolepis, synonymous with 

 //. Hi/uloides, Gervais, according to Fuhrmann (Zool. Jahrb., Suppl. Bd. 

 x., Heft 1., 1908, p. 76, footnote). 



i0 Ransom— Bull. U.S. Nat. Museum, 69, 1909, pp. 48-51. 



43 Linstow — Arch. Naturg., 1872, xxxviii., p. 57 ; Id., Arch. Naturg., 

 1904, I., pp. 306-7. 



±» Krabbe— Bidrag. etc., 1869, pp. 285-6., and figs. 109-111; Jacobi— 

 Zool. Jahrb. Syst., xii., 1898, pp. 95-104; Cohn-Centr. Bakt., I., xxv., 

 1899, pp. 224-5 ; Riggenbach— Centr. Bakt., I., xxv., 1899, pp. 885-6 

 (Referate) ; Colin— I\ova Acta, lxxix., 1901, p. 330; Clerc— Rev. Suisse 

 Zool,xi., 1903, p. 284 (not available to me); Linstow — Zool. Jahrb. 

 Syst.,xxiv., 1906, pp. 15-17; Fuhrmann— Zool. Jahrb., Supp. Bd., x., 

 Heft 1, 1908, p. 81 ; Id., Centrb. Bakt., etc., I., Orig., xlii., 1906, p. 739 

 (footnote) ; Ransom — Loc. (it., p. 46. 



±3 Clerc-Zool. Anz., xxv., 1902, p. 659 ; Id., Rev. Suisse Zool., xi., 

 1903, pp. 281-284. (not available) : Kansom— Loc. cit., pp. 42-48 (an abstract 

 of Clerc's latter paper is given here). 



44 Fuhrmann — Loc. cit., p. 7, p. 81. 

 15 Ransom — Loc. cit., p. 48. 



