926 MR, G. M. VEVERS ON CESTODA FROM MAMMALS 



lOOjuin length, having the hilum directed towards the shell- 

 gland. Tiie vagina, which arises from a point between the 

 ovaries, is 165 /z in length. 



As it approaches the genital opening it increases in width to a 

 maximum of 20 ;t, and at a point 30 /.i from the genital aperture 

 it narrows again to a fine duct, and opens into the genital atrium 

 alongside the opening of the cirrus pouch. 



The uterus lies horizontally in the segment, and in the 

 unfertilised segment is a sac-like lobulated organ (text-fig, 12, b). 

 In the ripe segment the uterus distends the whole segment and. 

 pushes its way to the extreme edges on both sides. The eggs are 

 single, oval in shape, and double-shelled. 



The diameters of the outer shell are 140 ju x 100 ^ : the 

 embryophore is much smaller, measuring only 40 fj. in diameter, 

 No embryonal booklets were seen. 



In 1908 Smith, Fox, and White (5) described a cestode from 

 Paradoxurus grayi which they named Tmnia paradoxuri. From 

 their description T. faradoocuri would seem to have no afiinities 

 with C. crassivesicula, the rostellum in the former species being 

 unarmed and the genital pores irregularly alternating, 



Up to the present the genus Cyclorchida is represented by the 

 single species G. omalancistrota from the Spoonbill {Platalea 

 leuGorodia). 



Cyclorchida crassivesicida, sp. n,, agrees with the generic 

 diagnosis of Cyclorchida as given by Ransom (1909) (6) in every 

 respect except in the statement that the adults occur only in 

 birds ; I have thei-efore emended the generic diagnosis to read 

 " Adults in birds and mammals.^' 



A comparison of the description of C. omalancistrota, as given 

 by LUhe in 1909 (7), with my material olfers no point of generic 

 significance upon which to base a difierent genus. 



T^NiiD^ Ludwig, 1886. 

 T^miNiE Stiles, 1896, 



EchinocoGcus gramdosus ['Ba.ts.ch., 1786), Eudolphi, 1805. 



The diagnosis of this species, as given by Hall in 1919 (2), is of 

 such latitude as to admit forms showing a variation of almost 

 100 per cent., and is evidently a careful compilation of the 

 characters as described by various writers. Although there are 

 many cases on record of larval foi-ms which vary considerably 

 from the typical Hydatid produced by the species E. granulosus, 

 up to the present the occurrence of more than one species of 

 adult does not seem to have been fully investigated. 



Stiles in 1906 (8) suggested that an. adult form from the 

 Dingo might be a new species. 



Liihe in 1910(9) redescribed Taenia oligarthra Diesing from 

 Felis concolor, Brazil, and compared it with Taenia echinococcus 

 V. Sieb. From his description it would appear to be a difierent 



