No. 1629. A NEW RABBIT CESTODE—HALL. 697 
The eggs vary in shape from spherical to the many-sided forms 
figured by Blanchard (1891, fig. 29) for Moniezia pectinata (=Cit- 
totenia pectinata). The outer shell membrane is about 2 » thick. The 
dimensions of the eggs are naturally very variable, ranging from 67 
to 105 ». The diameter of the pyriform bulb is about 20 p, the length 
to the point at which the horns come off is 28 to 34». The horns are 
filamentous and about 43 » long, with a width of 6 p» at the base. 
In toto preparations the ovaries are 
seen to disappear very suddenly with the kO 
growth of the gravid uterus (fig. 6), but a 
the testes and a remnant of the yolk and N | 
shell gland continue for a long time, and ws — 
the cirrus pouch and vagina persist to the 
end of the strobila. 
The two lateral excretory canals he at 
practically the same level in the proglot- 
tid, as Stiles (1896) figures them for @. 
marmote (figs. 8 and 4). In C. varia- 
bilis the dorsal canal lies dorso-median of 
the ventral. Lyman (1902) gives the 
same position for the canals in his Ameri- 
can C. pectinata, while in the European 
form Stiles (1896) states that a dorsal 
canal was not observed, and Riehm 
(1881) only found it for a short distance 
back from the head. In (C. mosaica the 
external of the two canals is the larger. 
The transverse canals occupy the poste- 
rior part of the proglottid and connect 
the four canals with each other. Other 
smaller canals connect the main longitu- 
dinal canals of each side, while others 
connect the transverse canals so that the 
excretory system forms a network as in 
C. pectinata, underlying the dorsally sit- wie. 6—Preparation sHowiNne 
uated reproductive system. In the pos- Ses eRe ay toa 
temiorsparu OL tne: strobilal tne) transverse © ‘yauauee ol Ovany. x, Unmnus. 
network disappears, as does the inner 
longitudinal vessel, leaving only the outer which follows closely the 
lateral contour of the uteri in a series of arcs. An excretory reservoir 
with lateral openings, as Liman (1902) describes and figures for 
the terminal proglottid of C. pectinata was not found in C. mosaica, 
the two large external canals apparently opening in the posterior 
proglottid direct. Possibly the original terminal proglottid was not 
present in the specimens studied. 
BS 
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