585 



mesticated birds. The type species M. ambiguus is 

 found in Gennetta gennetta (Linn6, 1758) [Viverra 

 jjenetta], and one species. M. lineatus (Goeze, 1782) 

 Rnilliett, 1803, is found in doo^s and cats. 



Subfamily DTPYLTDIINAK. 



(1858. Malarolppidota Weinland— Soft-shell tapeworms: 186^. 

 Cystoideae T^iiokart; Cystoidei; Cystoddotaeniae; Taenia 

 (Miorotaenla). 



Diagnosis: Head with 4 suckers: rostellum generally armed; 

 genital pores lateral Cmarginall, single or double; eg^ with thin 

 transparent shells, frequently arranged in egg sacs, in some 

 cases scattered through the segments; larval stage a cy.stlcer- 

 cold; adults in birds and mammals. Type genus: Dlpylidium 

 ■R. TyPuckart. ISfiS. 



Probably all of the Taeniidae of birds belonjj to this 

 subfamily, which is at present divided into nine genera 

 The tapeworms of domesticated fo-wls are confined to 

 the five genera: Totugnia. Davainea. Dicranotania, 

 Prepanidotaenia. and Echinocotyle. 



I. Genital pores double and opposite. Suckers unarmed. 



Three different genera have been proposed in the subfamily 

 Dipylidiina-e for forms with double and opposite genital pores, 

 but they have been very poorly defined from one another. 



The genus Dipylidium contains species which infest mammals 

 and with D. caninum as type species will unquestionably 

 stand as a good genus. In birds several forms with double 

 genital pores have also been described. Taenia digonopora 

 Pas<iuale in chiekens and Taenia bifaria Siebold In Aythya 

 nyroca (Nyroca leucophthalma) have been placed by Diamare 

 (1893A) in a new genus Cotugnia, which, however, he fails to 

 define distinctly from Dipylidium, and which must unquestion- 

 ably be suppressed unless better characters are brought to its 

 support. Diamare (1893A) has also proposed the genus Ama- 

 bilia for Taenia lamelligera in the flamingo (Phoenicopterus 

 antiquorum). 



Too little is known of the other forms described as possess- 

 ing double genital pores to allow a determination of their gen- 

 eric affinities, and speculation in this direction would simplv 



37»-lI 



