406 WILLIAM A. HASWKLL. 



been able to ascertain, of definite cells. On its inner surface, 

 i. e. the surface turned towards tlie ovary, it is fimbriated 

 (fig. 14), and it is doubtless through the agency of these 

 fimbria) tbat the ova are seized during the movements of the 

 apparatus. 



The oviduct (figs. 6 and 7, od.') runs, at first, nearly 

 straight back from the swallowing apj^aratus, on the ventral 

 side of the shell-gland and receptaculum seminis, and is 

 joined by the narrow fertilising duct (/. d.) from the latter. 

 In this part of its course (fig. 8) it has an epithelium com- 

 posed of short prismatic cells. Internal to this is a thin 

 cuticle beset on its inner face with numerous slender hairs, 

 resembling cilia in appearance, but non-vibratile, which lie 

 with their apices directed backwards, i. e. away from the 

 ovary, their arrangement thus being such as to prevent the 

 ova received from the swallowing apparatus from passing 

 forwards again towards the ovary. External to the epithe- 

 lium is a muscular layer composed of external longitudinal 

 and internal circular fibres. Surrounding this is a layer of 

 cells of the same general character as those that surround 

 the muscular layer of the swallowing apparatus. These 

 appear to correspond to the cells which Zschokke (20) looks 

 upon as glandular, and to those which Pintner ' regards as 

 the formative cells of the swallowing apparatus. In view of 

 Blochmann\s- results on the subcuticular muscle, however, 

 and Sabussow's (17) extension of the same view to the re- 

 productive ducts, I am more disposed to look upon these also 

 as myoblasts. 



A little behind its point of junction with the fertilising 

 duct the oviduct bends sharply round towards the dorsal 

 side, and is joined by the main vitelline duct at the posterior 

 limit of the shell-gland. From this point it runs forwards 

 for some distance with a sinuous course on the dorsal side of 

 the isthmus of the ovary and of the vagina, and then runs 



^ Sec Biiiuii, 5. 



' F. Bloclimaiin, " Uehcr i'reie Nciveiieudiiiigeu uud Siiiiiebzclleii bei Band- 

 wiirmerii," ' Biol. Centralbl.,' xv, 1S95. 



