Notes mi South African Mollusca. 147 



This is the most northerly race of the true ylobiilns which I have 

 yet seen, for on reaching Namaland the drooping globiilus aperture 

 is transferred to the thin, white-lipped T. nninaquamis, and the solid 

 shells, which might otherwise be considered almost inseparable 

 from <jlofi/tlnv, have the projecting aperture of T. rosaceus. 



The peristome is sometimes thickened a little squarely, hut 

 this feature is not usually nearly so marked as in rosaceus or 

 porphyrostoma. 



The anatomy of this species was described and figured by Pilsbry 

 in 1905 :;: . Six years earlier Moss and Webb published a description 

 and figure of the reproductive organs of a specimen from Robben 

 Island-) ; while so long ago as 1880 Binney described the jaw and 

 radula and figured some of the teeth {. Pilsbry and Moss and Webb 

 state that the jaw is smooth, which does not agree with the observa- 

 tions of the present writer : Binney merely says that it is without 

 anterior ribs. Moss and Webb's figure does not show the swollen 

 anterior end of the receptacular duct, but this is shown in Pilsbry's 

 figures. 



It will be seen by comparing fig. 9 with figs. 10 and 1 1 on PI. IV. 

 that, in the specimens examined, the teeth of the radula of this 

 species are actually a little larger than those of T. rosaceus and 

 T. porphyrostoma, notwithstanding that its shell, jaw, and repro- 

 ductive organs are so much smaller. It is therefore not surprising 

 to find that the number of teeth in each transverse row in T. 

 globulus is usually less than in the other forms. Binney gives the 

 number as about 81, Pilsbry as about 90, while in the specimen 

 described above it is about 94. 



Apart from the radula, perhaps the most distinctive anatomical 

 characters of the present species are the jaw, the long epiphallus, 

 and the internal structure of the penis. Further information is 

 desirable about the external features of the animal. 



TEIGONEPHRUS GYPSINUS (Melv. & Pons.). 

 (Text-fig. 2 and PI. II, f. 3.) 



1891 Helix (Dorcas ia) gypsina, M. & P., A.M.N.H. viii. p. 238. D. 



Shell elongate-globose, umbilicate, fairly solid, translucent, 

 type bleached pale buff, peristome and callus apparently faded 

 brown. Spire rather produced, apex rounded. Whorls 4, very 



* Proc. Mai. Soc., vi. p. 286. PI. XIII, f. 6-9, pi. XIV, f. 13, 15. 

 t Proc. Mai. Soc., iii. p. 264. 

 I Ann. NT. Acad. Sci., i. p. 361. PI. XIV, f. K. 



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