38 JOHN E. GUTBERLET 



Male Reproductive Organs: Testes (Fig. 17, t) 20 to 30 in 

 number in posterior portion of segment. Vas deferens much 

 coiled before entering base of cirrus pouch, also coiled within latter. 

 Cirrus pouch ellipsoidal, 120 to 150//, long by 55 to 70/t wide. 

 Cirrus when protracted 10/t in diameter, armed with minute spines, 

 and with bulbous enlargement 20/n in diameter at its base, where 

 it becomes continuous with cirrus pouch. 



Female Reproductive Organs : Vagina enlarged before reach- 

 ing median line into small seminal receptacle (Fig. 17, sr). Ovary 

 occupies middle field in front of testes. Yolk gland and shell 

 gland posterior to ovary, ventral and dorsal, respectively, in rela- 

 tive position. Uterus at first in front of ovary as cord of cells ; 

 gradually increasing in size, finally occupies most of segment and 

 frequently extends laterally beyond excretory canals. In oldest 

 proglottids it becomes divided into compartments, or capsules, 

 each containing a single egg. Embryo (Fig. 30) 36 by 27(1 in 

 diameter, with very thin membrane closely adherent to surface. 

 Embryo further enveloped by thicker, smooth fibrous membrane, 

 oval in shape, 45 to 40/a in diameter, with filament at each pole 

 attaching to thin outer wrinkled membrane about 35 by 50/t in diam- 

 eter : finally egg is surrounded by capsule composed of outer and 

 inner membrane, latter closely adherent to or fused with outer 

 egg membrane ; and former more or less widely separated from 

 latter and connected with it by number of septa. 



One of the principal points noted here that is not mentioned 

 by other authors is the size of the rostellar hooks. In my speci- 

 mens they seem to be somewhat larger than those described by 

 others. They have been described as being 8 to lO/x long, while 

 my forms show many of them to be distinctly I2fi in length. A 

 second point noted here is the method of the development of the 

 uterus. The uterus develops in front of the ovary. It first ap- 

 pears as a solid cord of cells connected with the united ducts of 

 the ovary, shell gland, and yolk gland. The solid cord of cells 

 which later gives rise to the uterus becomes hollow and appears 

 as a blind sac or tube. This then grows in size, forming pockets, 

 and finally fills up the entire proglottid. 



