420 MR. R. C. LEWIS ON 
one, sometimes two, simple transverse tubular uteri in each 
segment, uterus generally with proximal and distal diverticula. 
Vagina ventral to cirrus-pouch on both sides of segment. Dorsal 
canal usually between ventral canal and nerve. Genital canals 
cross longitudinal canals and nerves dorsally. Interproglottidal 
glands absent. Caleareous bodies not yet recorded. Eggs with 
well-developed pyriform bodies, the horns of which are long and 
filamentous, crossing each other. Riehm based his diagnosis on 
the noteworthy spread of the excretory system, which is not 
ladder-like, but consists of three to five chief side stems and nume- 
rous net-forming branches; on the double reproductive organs, 
which open on the projecting lateral borders of the segments ; 
and on the head appearing pushed-in in front and hookless. 
Blanchard’s diagnosis of the genus Moniezia differs from that 
of Cittotenia in that on the right side the vagina is ventral 
to the cirrus-pouch and on the left side dorsal. Interpro- 
glottidal glands present, and the horns of the pyriform body do 
not cross, and end in a disk. The genus Thysanosoma, founded by 
Diesing, 1835, contains double pored cestodes very similar to 
those included in the genus Cittotenia, but differs in that the 
genital canals cross the ventral canals and nerve dorsally and the 
horns of the pyriform body are absent. There is one transverse 
undulating uterus, and forms with one set of genital glands and 
one genital pore are also included. Stiles states that from the 
analysis of characters Cittotenia forms a genus intermediate 
between Moniezia and Thysanosoma. The first of the species 
now to be described was at first thought to belong to the genus 
Thysanosoma Dies., resembling most closely Thysanosoma jum- 
briata Dies., but it was found that the genital canals cross the 
excretory canal and nerve dorsally, and that the species shows 
considerable resemblance to Cittotenia zschokket von Janicki (10) 
and agrees with this species in the absence of the pyriform body. 
Von Janicki therefore holds that the generic diagnosis of the 
genus Cittotenia should be altered from pyritorm body present to 
pyriform body present or absent. Von Linstow in his description 
of Cittotenia quadrata (20) describes and figures the vagina 
running out and opening dorsal to the cirrus-pouch, and does 
not state that this is contrary to the normal occurrence in the 
genus. It is evident from the large number of synonyms for 
each species, and from the departure from the generic charac- 
teristics in some of the original descriptions, that the genus 
Cittotenia requires revision. The two species from the Wallaby 
show the generic characteristics as described for the genus Citto- 
tenia by Stiles and Hassall (26) and are therefore included in that 
genus. 
CITTOTENIA LAGORCHESTIS, sp.n. (Pls. I.-IV.; V. figs. 14,15; 
VI. figs. 17, 18.) 
The specimens vary in length from 40-60 mm. and the greatest 
breadth is 4 mm. There are usually about 150 proglottides. 
