298 WILLIAM A. HASWELL. 



nucleus ; passing from it to the oviduct or uterus is the narrow 

 duct (d.), which is essentially a process of the cell substance. 

 As the duct passes through the wall of the uterus it acquires 

 definite boundaries, and presents a little vesicular enlarge- 

 ment (d.) just before it opens into the uterus. Leading from 

 the uterus to the genital cloaca is the vagina, a short, narrow 

 passage, which in T. novse-zelandise is provided at its mouth 

 with a series of chitinous teeth. 



The vitelline glands (PI. XXII, figs. 15 and 16) consist of 

 a number of rounded lobules arranged in narrow branching 

 lobes, which, for the most part, take a transverse direction. 

 These lobes are very closely applied to the wall of the intestine, 

 which they almost entirely cover, both on the dorsal and on the 

 ventral aspect. The muscular septa pass outwards from the 

 wall of the alimentary canal, and through between the lobules 

 of the vitelline gland in such a way as to bring about an 

 imperfectly metameric arrangement in irregular transverse 

 lobes, which, however, branch and anastomose with one another. 

 The arrangement of the lobes and the degree to which the 

 glands are developed vary somewhat in different individuals. 

 The lobules are invested in a thin layer of the parenchyma 

 muscle, which is continuous with that constituting the septa, 

 and similar to the layer investing the intestine. The central 

 substance of the lobules is composed of large irregular cells 

 with ill-defined boundaries, whose protoplasm is clear and 

 colourless in the fresh state, but with a number of large 

 granules which become more evident in hardened specimens ; 

 the nuclei resemble those of the alimentary epithelium ; 

 throughout the protoplasm there are frequently large rounded 

 vacuoles. 



The ovary (PI. XXII, fig. 11) is an oval solid body *16 mm. 

 in length, attached to the right wall of the receptaculum seminis, 

 close to the beginning of the oviduct. The ova are narrow 

 pyramids about *083 mm. in length, each of which passes trans- 

 versely through the entire thickness of the ovary. The 

 impregnated ova are received singly into the uterus, where they 

 become surrounded by a considerable quantity of vitelline 



