324 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



rows. The teeth are very similar to the preceding species, and 

 a detailed description seems scarcely necessary. 



Genitalia (Fig. 14). — Penis (^.) with the retractor muscle at the 

 apex; the vas-deferens [v.d.^ forms a slender tube, it unites with the 

 penis in a small papilla a little below the apex, separating from the 

 oviduct at the base of the enveloping sack or lobe ; the spermatheca 

 {spr.) situate somewhat high on the oviduct, tapering, the upper half 

 slender, with a globose termination. The hermaphrodite gland, 

 albumen gland, and enveloping sack are similar to the preceding 

 species. 



7. PLAcosTTLTrs BoviNTTS, Brug. PI. XYI, Figs. 7 and 8. 



An example of this rather rare species, preserved in spirits, has 

 been placed in my hands by Mr. Drew, with a small bulimoid shell, 

 the latter under the name of Bulimus antipodarum, Gray. There is 

 no doubt this small shell (Fig. 7) is the young of Placostylus hovinus. 

 I have had the opportunity of examining a good series, well 

 illustrating the growth of the species. It has been pointed out by 

 Mr. Suter^ that Bulimus antipodarmn, Gray, is not a Placostylus, 

 but, in all probability, Selicostyla fulgetrum, Brod., accidentally 

 introduced. 



Animal. — Spirit specimen ; the sides of body, neck, and tail black 

 and granulated, the lines of granules somewhat irregular and sloping 

 to the foot margin ; tail depressed and somewhat pointed ; foot dull 

 leaden colour; ommatophores black, of medium length, genital pore 

 a little behind the right ommatophore. Mantle with an even margin ; 

 a small fold projects from the under surface, commencing at the 

 respiratory aperture, and extending almost to the dorsal line, 

 a corresponding but smaller fold occurs on the left side ; respiratory 

 and anal apertures in the cleft of the right fold. 



Genitalia (Fig. 8). — The penis {p.) is large and muscular, with 

 a slight contraction in its lower half ; a little below this point the 

 outer envelope or sheath separates from the penis, and forms a broad, 

 strong membrane, which is attached to the anterior portion of oviduct 

 and adjoining body-wall. The retractor muscle (r.m.) is inserted at 

 the apex, and attached distally to the dorsal body-wall, about midway 

 between the pulmonary chamber and mantle margin ; the vas-deferens 

 {v.d.) forms a slender tube, the free portion short, it passes under the 

 sheath at the point of separation, its outline may then be followed, 

 curving round as represented by the dotted lines, and enters the cavity 

 of the penis a little below the apex ; at this point the interior walls 

 are strongly corrugated, as illustrated in the cross section {p.s.). 

 The hermaphrodite gland forms four or five small lobes imbedded 

 in the liver ; hermaphrodite duct closely convoluted, and of a dark 

 colour. Albumen gland (al.g.) large, tongue-shaped; from the base 

 of this gland proceed the uterus {u.) and prostate (pr.), whitish in 

 colour, becoming darker in the lower portion, and thrown into several 



^ Trans. New Zealand Inst., vol. xxvi, pp. 125-6. 



