37 



NOTE ON THE ANATOMY OF ZONITES ROLLEI, Kobelt. 



By Walter E. Colxdtge, F.Z.S., etc., 

 Mason University College, Birmingham. 



Mead 8th December, 1899. 



Lx a collection of Land Mollusca which the Council of the Birmingham 

 Natural History and Philosophical Society have recently placed in my 

 hands for investigation, there are two or three examples of Zonites 

 Wottei, Kob., from the Island of Meis, Asia Minor. Since no part of 

 the anatomy of this species has yet been described, tin- following note 

 may be of interest, and may possibly help to more definitely locate the 

 spi cies. 



Viewed externally, the generative orifice is seen to be situated on 

 the right side of the body about 9*5 mni. posterior to the right upper 

 tentacle (Fig. I, g.o.). This leads into a small vestibule, which, looked 

 at with the animal's bead towards the observer, is seen to have a small 



IV 



Zonites Rollei, Kobelt. 



Fig. I. — Outline of anterior portion of the right side, showing position of the 



generative orifice, g.o. 

 Fig. II. — Terminal ducts of the generative organs. vg. vagina, v. vestibule, 



v.d. vas-deferens. r.d. rei eptacnlar duct, r.s. receptacular seminis, f.ov. 



free oviduct, op. oviduct, pr. prostate, p. penis, Jl. flagellum, r.m. retractor 



muscle. 

 Fig. III. — View of the internal wall of the penis. 

 Fig. IV. — Spine from internal wall of the penis, enlarged. 



opening on each side of the cavity. That on the right side leads into 

 a wide tube, the vagina. Externally the vagina appears much larger 

 than the lumen ; the outer side of its walls has a glandular appearance 

 and seems to be densely folded (Fig. II, vg.). 



The receptaculum seminis in life is closely attached to the common 

 duct, and completely hides the prostatic portion. The receptacular 



