NATURAL SCIENCES OF PHILADELPHIA. 39 



Zonites Isevigatus, Pfr., pi. III., fig i. 



I have examined numerous specimens, but have some liesitation 

 in giving m}' figure and description as absolutelj^ perfect. I had 

 great difficulty in dissecting the species. 



The ovary is short and vagina long. The genital bladder with 

 its duct forms a short cylindrical sac-like organ, opening ne.ar the 

 base of tlie vagina, and tapering at the apex. The penis sac is 

 long, cylindrical, larger at its apex where it receives the vas de- 

 ferens. At its base the penis sac has its opening into the vagina 

 with a short stout organ (fig. 13) with rounded apex, where a re- 

 tractor muscle seems to be attached. This organ may be a dart 

 sac or some form of prostate gland. 

 HempMllia glandulosa, Bl. and Binn., pi. III., fig. v. vi. 



Tiie testicle is composed of a large globular mass of aciniform 

 caeca. It lies looselj- upon, not imbedded in, the upper lolies of 

 tlie liver. The ovary and oviduct are as usual. The genital 

 bladder is globular, very large, on a short stout duct, entering the 

 vagina near its base. The penis sac is long, C3lindrical, larger 

 towards its apex, where both tlie retractor muscle and vas de- 

 ferens enter. 



In several specimens examined, the penis sac appeared some- 

 what different. It had a large globular bulb (5a) at its apex. 

 The vas deferens (1) entered beyond the middle of the length of 

 the sac (5) ; it was greatly swollen (56) before entering the sac, 

 for a distance equalling about one-half of the length of the sac. 

 At the commencement of this swelling the retractor muscle (6) 

 was inserted. This form of penis sac is figured in fig, vi. 



The balance of the anatomy of Hemphillia seems to be as in 

 the other slugs. 

 Helix Kelletti, Forbes (Arionta), pi. III., fig. iv. The Catalina Island form. 



The ovary is light yellow. The oviduct is white. The genital 

 bladder is light yellow. The prostate is large and j^ellow. 



The whole genital system is long and narroAV. The genital 

 bladder is small, globular, on an extremely long and delicate duct 

 which enters the vagina at its npper end. The duct just below 

 the bladder receives a branch duct, very long, flagellate, three 

 times the diameter of the duct itself. The penis sac is long, stout, 

 cylindrical, tapering towards its apex and prolonged into a very 

 long delicate flagellum. The vas deferens enters at the point 



