174 Transactions of the Royal Society of South Africa. 



Affinities. — Although originally placed in Glandina, this species has 

 usually been assigned to the genus Bidiminus or Ena, and so recently as 

 1918 Germain made it the type of a new subgenus of Buliminus to which 

 he gave the name Pseudocerasfus.* The present species, however, has 

 certainly no affinities with Buliminus or Ena, as is evident from the sculpture 

 and form of the shell, the peripodial grooves and caudal mucous pore, the 

 sigmurethrous kidney, the radula with its very narrow central teeth, and the 

 reproductive system in which neither the penis nor the receptacular duct 

 possesses a lateral appendix. Undoubtedly Pilsbry f is right in assigning 

 this species and its allies to the genus Pseudoglessula, of which Pseudoceraslus 

 maybe regarded as a subgenus, differing but little from Pseudoglessula s. s., 

 though in some respects more nearly resembling the subgenus Kempio- 

 concha.% 



Pseudoglessula is correctly placed in the family Achatinidae ; yet it is 

 a decidedly aberrant member of the family, both as regards the radula and 

 the foot with its caudal mucous j)ore, and so far as we know at present 

 the only other genus to which it seems to be at all closely related is Krap- 

 fiella. § It is true that a caudal mucous pore is also found in Ferussacia \\ 

 and Crypfazeca, ^ but while these genera may be more nearly related to 

 the Achatinidae than to the orthurethrous genera with which Pilsbry ** 

 has provisionally associated them,-|"j- it is unlikely that they are at all closely 

 allied to Pseudoglessula. 



Pseudoglessula {Pseudocerasius) cressyi sp. n. 



(Plate IV, fig. 28 ; Plate VII, figs. 1-7.) 



Shell rather large, turriform, subrimate in the type, but frequently 

 imperforate, thin, silky, nearly transparent, normally corneous violet- 

 brown. Spire produced, apex mammillate. Whorls 8, not very convex, 

 regularly increasing, slightly bluntly angulate at the periphery, except on 

 the last whorl of fully mature examples ; the first 2 strongly and rather 

 distantly transversely costulate, with traces of very fine, microscopic spiral 

 striation between the ribs, remainder covered with close, regular, slightly 

 oblique transverse costulae, which become fainter below the periphery so 



* Bull. Mus. Hist. Nat. Paris, vol. xxiv, pp. 258, 259. 



t Bull. Amer. Mus. Nat. Hist., vol. xl, 1919, pp. 151, 152, 158. 



I Preston : Rev. Zool. Afric, vol. iii, 1913, pp. 53, 212. 



§ See Watson : Proc. Malac. Soc., vol. xiv, 1921, p. 135. 



II Godwin-Austen and Nevill : Proc. Zool. Soc, 1880, p. 663, pi. Ixiv. 



T] Folin and Berillon : Journ. de Conchyl., vol. xxv, 1877, p. 397 ; Contrib. Faune 

 Malac. Region extreme S.-O. de la France, III<^. fasc, pp. 17-21, pis. iii, iv. 

 ** Man. Conch (2nd ser.), vol. xix, 1908, pp. 211 et seqq. 

 ft Watson : Proc. Malac. Soc, vol. xiv, 1920, p. 26. 



