AVIAN CESTODES. 877 



par ui\ parencliyme vacuolaire, qui Forme autour de I'oncosph^re 

 des cellules hexagonales d'un diametre d'envii-on 0'". 17. Les 

 proglottis murs ressemblent ainsi bea.ucoup a. ceux de certains 

 Davainea a capsules uterines ne contenant qu'un ceuf." The 

 difficulty in comparing my genus with this particular J/o/?o/)?/Zic^mm 

 is tliat Fuhrmaun says very little of a pre-existing uterus. 



He merely observes that quite early in the body " I'uterus 

 commence deja a se former," a.nd that further back " les segments 

 sout remplis d'oeufs." I a,m disposed, however, to think that this 

 implies a likeness to the more typical species — such as, for example, 

 M. unicoronaia, which Fuhrmann describes immediately after 

 dealing with M. rostellatiim. Moreover, in his resume of Avian 

 Oestodes, Furhmann* defines the genus Alonopylidiam by, inter 

 alia, the following character : — " Uterus stark verzweigt, lost sich 

 in Parenchymkapseln auf ,"etc. As M.rostellaUtm had been already 

 described by him it is to be inferred that this species agrees with 

 the others, and is, therefore, so far not like the Tseniid which 

 forms the subject of my present communication to the Society. 

 We may, therefore, I think, exclude my species from the genus 

 A£onopylicUum. Nor does it appear to me that we can refer it 

 to any other known species. I propose, therefore, to name and 

 characterize a new genus as follows : — 



Eugonodseum, gen. nov. 



Rostelhcm very muscular, long and retractile, ivithout hooks. 

 Suckers unarmed. Ripe proglottids never 'much longer than hroad. 

 Dorsal excretory tube much smaller than ventral, lying more or 

 less laterally to it ; ventral vessels connected hy transverse vessels in 

 each proglottid. Longitudinal muscles in two roios of bundles. 

 Genital pores U7iilateral. Genital ducts jmss betiveen excretory 

 tubes. Testes chiejiy behind ovary, and then not very numerous. 

 Ovary to pore side, in front of vitellme gland. Genital atrium 

 very deep, with radiating muscles. Cirru,s-sac large and muscular, 

 lying in front of vagina. Sperm-duct with coil. Cirrus unarmed. 

 Receptacuhhm semdnis present, but not strongly marked. Uterus 

 not present. Ova imbedded singly in parenchyma accompanied by 

 other cells ; round each ovum a cavity is formed Icder lohich is 

 lined by cells. 



I name as the type Eugonodcemn mdicnemi, sp. n., with the 

 characters of the genus. 



* " Die Cestoden der Vogel," Zool. Jalivb. Supp].-Bd. x. 1908, p. 65. 



Piioc. ZooL. Soc — 1913, Xo. LIX. 59 



