Murdoch. — On Paryphanta busbyi. 261 



of these organs sectional investigation is necessary, and fig. 5 

 has in part been constructed from the data thus obtained. 

 The anterior portion of the vagina {ant. vg.) forms a wide 

 chamber, closed posteriorly by a valve-like papillar structure 

 (vg. p.) ; the interior walls are slightly darkish in colour, and 

 weakly longitudinally plicated. The papilla is continuously 

 united with the vaginal wall, and the perforation through its 

 centre is the only communication with the oviduct. Its an- 

 terior third projects freely into the anterior vaginal chamber. 

 Its walls are comparatively thick ; internally they are lightly 

 longitudinally plicated, and have a whitish epitheloid lining. 



The penis (p.) opens into the posterior portion of the 

 papillar structure in the form of a small tube ; it proceeds 

 through the thick vaginal wall in an oblique anterior direction, 

 and becomes slightly enlarged or bulbous towards its termina- 

 tion. The vas deferens (v. d.), as previously stated, is free 

 to a very limited extent, and is imbedded in the vaginal wall. 

 Its posterior prostatic course through the prominent folds or 

 plications of the oviduct is tubular to a little above the 

 position of section b, thence open, but for a short distance 

 enfolded on all sides by the above-mentioned plications as 

 figured in section c. From this point to the albumen gland 

 it is a well-marked area of a rusty brownish tint, and some- 

 what separated from the uteral portion by the longitudinal 

 folds. The uterus (ut.) is thrown into numerous sacculations, 

 and its interior walls are richly convolutely plicated. There 

 is no indication of a receptaculum seminis. The albumen 

 gland (alb. g.) is very large, a usual feature in this group of 

 animals ; in outline it is roughly boot-shaped. The her- 

 maphrodite duct (h. d.) enters near the base of the albumen 

 gland ; it is a simple straight tube, with several short lesser 

 tubes branching from it and uniting with the several masses 

 which form the hermaphrodite gland. The latter (h. g.) are 

 closely convoluted structures and imbedded in the liver. 



When compared with Schizoglossa novoseelandica it is 

 found that the vas deferens in the latter species is free to a 

 greater extent, that no portion of its internal prostatic course 

 appears to be tubular, and there does not appear to be any 

 vaginal papilla. During copulation the atrium is everted ; the 

 penis pore is thus brought forward and may be detected on 

 the everted wall. In P. busbyi what I have termed the 

 anterior vaginal chamber doubtless undergoes complete ever- 

 sion, and the vaginal papilla will be thrust outwards to a con- 

 siderable degree — probably to a much greater extent than the 

 appearance of the organ in its present condition suggests. 

 The generative organs of the three previously mentioned 

 species differ from each other in a rather marked degree, and 

 the type of the genus further accentuates the divergence. 



