BY C. HEDLEY. 



63 



The genital orifice is situated as usual at the base of the right 

 tentacle. The penis sac is remarkable for expanding immediately 

 above the common genital chamber into a semiglobose ribbed 

 dilatation, also for continuing beyond the insertion of the vas 

 deferens into a flagellum 15 m.m. in length. The oviduct com- 

 mences near the centre of the spindle-shaped vagina ; the latter 

 gradually tapering to the commencement of the duct which leads to 

 the genital bladder. This lengthy canal appears shorter from being 

 invaginated within itself, like a half-expanded tentacle, and termin- 

 ates in a boot-shaped genital bladder. My specimens being 

 imperfect, I was unable to examine the testicle. 



Through the kindness of Mr. Wild in furnishing me with 

 specimens, I am, enabled to make the following observations on 

 Pedinogyra cunninghami, Gray. — The jaw is without ribs, smooth, 

 arcuated, faintly striated, transversely and longitudinally ; ends 

 rounded. The rachidian tooth of the lingual ribbon is a small 

 blunt lanceolate cusp. A single rounded cusp which hardly overlaps 

 its basal plate is presented by the laterals. The marginal type 

 commences about the 22nd tooth, and possesses an ovate inclined 

 cusp on a square basal plate. 



The testicle, consisting of numerous fasciculi, is imbedded in 

 the extremity of the liver. A small oval genital bladder communi- 

 cates by a long slender duct with the vagina ; opposite to its 

 entrance branches off a similar duct, which appears to correspond 

 with the multifid vesicle of some Relicida3. The whole genital 

 system is at this point firmly bound by muscles to the wall of the 

 visceral cavity. The vas deferens attains an unusual size before 

 joining the penis sac, which is without a flagellum. 



In the accompanying sketches, the various parts are indicated 

 by the following lettering : — 



r. testicle. c.o. common orifice. 

 ep. epidymis- v. vagina. 



a.g. accessory gland. d.g.b. duct of genital bladder. 



pr. prostate. g.b. genital bladder. 



v.d. vas deferens. * r.p. vaginal prostate. 



r. retractor muscle. ov. oviduct. 



p.s. penis sac. o. ovary. 



