NO. 1629. A NHW RABBIT CHESTODE—HALL. 693 
Stiles (1896) to show its relation to the other rabbit cestodes of the 
Pectinata group: 
1. Anoplocephaline having ova with pyriform body, genital canals passing 
dorsal of longitudinal canals and main nerve trunk, uterus a transverse 
tube, single or double, genital pores double, vagina ventral of cirrus pouch 
COU, “| XO LO SSI WAS ep ge aaa eg Sea ae Cittotenia, 2 
2. Cirrus pouch muscular, generally pyriform, distinct, and swollen proximally 
ID VgAViE STC UN ais Cana Tina a Sater re fhe eer He Ee nS NOES ee Moree eee Marmot Group. 
Cirrus pouch resembling nozzle of hose, of nearly equal diameter throughout; 
not swollen by any prominent vesicula seminalis________ Pectinata Group. 3 
3. Testes in a band extending across the proglottid and lateral of ovaries_____ 4 
Testes in groups or inva band not extending lateral of ovaries_=—=___- == _ =| 5 
4, Cirrus pouch about 1 mm. long, extending some distance median of longi- 
TENDS vanes bere Waa MSN Na ae cece an i Ue eet aC Cittotenia pectinata. 
Cirrus pouch 475-640 ph long, entirely lateral of longitudinal canals. 
Cittotenia mosaica. 
5. Testes in two groups, one for each ovary, extending lateral of ovaries but 
ADSentekromem calla ile] dees ee ee Cittotenia perplexa. 
Testes in a band not extending lateral of ovaries_______ Cittotenia variabilis. 
C. bursaria v. Linstow (1906) may be placed with the Marmote 
group on the pyriform shape of the cirrus pouch as figured, though no 
vesicula seminalis is described or figured as occurring within the cirrus 
pouch. Other features would relate it to the Pectinata group, but 
for various reasons I have not discussed it further in this paper. 
The anlagen of the female glands and the testes of C. mosaica 
appear almost simultaneously in about the twenty-seventh proglottid, 
2mm. from the anterior end, the genital canals first showing in the 
fifth or sixth segment after this. In this regard C. mosaica differs 
from the other members of this group in which the anlagen appear 
as follows: In C. pectinata the female glands and ducts are first indi- 
cated “ immediately back of the head,’ according to Stiles (1896), the 
testes first appearing 6 to 7 mm. from the anterior end, Stiles (1896), 
Lyman (1902) ; in (. perplewa the anlagen of female glands and ducts 
occur 0.64 mm. from the anterior end, Stiles (1896) ; in C. variabilis 
roundish anlagen of the female glands, later becoming pistol-shaped, 
appear 5 to 10 mm. from the anterior end, Stiles (1896). Seeming 
differences in actual and relative occurrence of anlagen may be due 
to differences in technique. In (. mosaica the anlagen of the ovaries 
and testes first occur practically simultaneously in section, though the 
anlagen of the ovaries are visible long before those of the testes in toto 
mounts of the entire animal. Part of the statements of Stiles and of 
Lyman may have been, and in fact appear to have been, based on 
studies of toto mounts. 
The testes are in the posterior part of the proglottid, and from a 
dorsal or ventral view show mostly a single row, with only occasional 
doubling, extending past the ovaries almost to the lateral canals. 
In a cross section of the worm the testes are seen to be arranged in 
Proc. N. M. vol. xxxiv—08———45 
