1908] 



Female Reproductive Organs of Cimhex 



89 



13 and 18, d). Near the opening of the duct are two bundles 

 of transverse muscles, which leave the dorsal wall of the duct and 

 attach to the basal margin of the sheaths of the saws (Figs. 13 

 and 17, tm). Dorsally, the colleterial duct is in continuation 

 with two lobes (Fig. 13, dl) which, in turn, are in continuation 

 w4th the membrane that lines the inner surface of the saws. 

 Ventrally, the wall of the duct terminates in a large fold (Figs. 

 13 and 18, vf). The duct of the colleterial sac thus opens out 

 between the tw^o dorsal lobes and the large ventral fold (Fig. 13 , c/) . 

 When the spermatheca and colleterial sac are carefully pulled 

 away from each other, there is revealed a triangular chitinous 

 plate, which rests upon the dorsal wall of the oviductus communis. 

 To this plate several bands of muscle attach (Fig. 13, tp). 



HISTOLOGICAL STRUCTURE OF THE FEMALE REPRODUCTIVE ORGANS. 



Ovaries: Each ovary is made up of a variable number of 

 ovarian tubules or ovarioles, there being usually between twenty 

 and thirty. In six specimens dissected, the number of ovarian 

 tubes in the entire ovary was neither constant nor equal in either 

 ovary, as is shown by the following figures : 



Ovarioles in Right Ovary. 



Total in Both. 



28 

 21 

 27 

 25 

 25 

 30 



Average, 26 



51 

 44 

 52 

 52 

 49 

 58 



51 



When the lowest egg in each tubule is ripe or nearly so, it is 

 elongated more or less ovoid in shape with the distinction between 

 dorsal and ventral surfaces indicated by a difference in curvature. 

 After the lowest egg in each ovariole has passed out of the egg- 

 tube, each tubule appears to be supported upon a stalk which 

 opens into the oviduct. Alternating with each egg-chamber is a 

 nutritive or yolk-compartment, the latter being distinguishable 

 from the former with the naked eye only at the basal end of the 

 ovarian tubule by its smaller size. The nutritive chamber, 

 which is anterior to the basal egg, is usually smaller (Fig. i, nc) 

 than the one between the next two eggs. Towards the distal 

 end of the ovariole, however, egg-chambers and yolk-chambers 

 cannot be distinguished as such with the naked eye by a difference 



