276 T. B. ROSSETER ON A NEW 



0*067 mm. Its distal end is concave, whilst its proximal end, or 

 efferent duct, is drawn out to form the vas-deferens (Fig. 3, c), 

 which is a short serpentiform duct. The vesicula seminalis 

 (Fig. 3, b) is an elongated oval sac, 0*17 mm. long and 0*027 mm. 

 in diameter. This includes the cirrus-sheath. The cirrus is a 

 smooth rod 01 14 mm. long and 0*002 mm. in diameter. When 

 exserted for the purpose of coition the cirrus-sheath is extruded 

 with it from the male genital pore, and when so extruded a 

 stricture occurs in the anterior portion of the hyaline sheath, 

 which forms a hollow bulb. 



Prostate glands are absent, or, if they exist, I have not been 

 able to locate them by staining. 



The female genital pore (Fig. 4, e) is situated behind the male, 

 a distance of 0*034 mm. from the ventral lateral corner of the 

 segment. It is a simple circular depression of the cuticle, and 

 the vagina is a smooth muscular cavity. The vaginal canal 

 (Fig. 4,/) runs obliquely up wards to the anterior border of the 

 proglottis, when it curves distally and proximally, forming a ring, 

 and, running distally, forms the receptaculum seminalis. 



The receptaculum seminalis (Figs. 4 and 9) is an oval sac 

 0*085 mm. long, and w T ith an approximate diameter through the 

 median line of 0*034 mm. It is partially covered dorsally by the 

 monotestis. 



The ovaries (Fig. 4, hh) are paired organs. In the early 

 stage of their development they are globular, but in the mature 

 or secretive stage they develop into a series of lobular glands. 



The yelk and shell glands (Fig. 4, i, j) are superimposed in the 

 median posterior portion of the segment. 



The uterus (Fig. 5) consists of a series of six or more globular 

 pouches, clustered at intervals around the uterine canal in a 

 staphylitic form. The uterine eggs (Figs. 7 and 8) are somewhat 

 citron-shaped. They have a mean length of 0*044 mm., and a 

 diameter of 0*034 mm. The shelly covering is, at either polar 

 axis, elongated into what is apparently an air-chamber. Besides 

 the outer covering or shell, the embryo is enclosed in a trans- 

 parent structureless membrane. The proximal chamber, or 

 pocket, yields by compression, and opens like a catch -spring ; and 

 by this means the contents of the ovum (viz. the six-hooked 

 brood, or hexacanth stage) is emitted through the orifice (Figs. 7 

 and 8). These polar chambers or pockets are distinctly different 



