82 



PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



or "uterus." At its lower end it bears a flattened vesicle (ff ■><.), 

 glandular also, wliicli may very likely secrete the hard egg-shell. 

 The very short portion beyond this vesicle (incubatory chamber, d.i.) 

 is not glandular, and opens freely into the pallial cavity. 



EXPLANATION OF FIGURES. 



Fig. I.— Copy of Clapamle's fig. 30. 



a. AVeibliche Nebendruse. h. Eilciter. c. Samentasche. d. Scheide. c. Scheiden- 

 offnuug-. /. Kugelige Ausclieilung der Gebarmuttei'. (j. Darm. /(. After. 



The author states that there is a communieatiou between Samentasche (c) and 

 Nebendruse (a) ; this latter, according to his view, has no opening on the outer 

 surface. 



Fig. II. — The reproductive apparatus of the female oi Ncrifina JtuviafUis. (Much 

 enlarged. The course taken by the spermatozoa prior to fertilization 

 is indicated by arrows.) 



a.e. External oviducal aperture, a.i. Intromittent aperture, b.c. Bursa copulatrix. 

 d. Oviduct. d.c. Connecting duct. df. Fertilization or impregnation 

 chamber. d.g. Glandular segment of oviduct. d.i. Incubatory segment 

 of oviduct, g.s. Supposed shell gland, sp. Spermatheca. v.c. Copulatory 

 vesicle. 



The copulatory branch presents a totally different aspect. Its lowest 

 part {h.c), which may be called tlie " vagina " or bursa copulatrix, opens 

 a short distance from the incubatory aperture {a.e ), close to the anus, 

 and bears at its upper end two diverticula. The larger of these {v.c.) 

 I propose to term the copulatory vesicle. The smaller (s/?.), which 



