144 Annals of the South African Museum. 



Near Cape Point (browningii, Browning). Bredasdorp ; Cape Point 

 (eratina, Layard). 



Prionacis was founded on a single specimen furnished by Layard 

 from Bredasdorp ; browningii on two found by Browning near Cape 

 Point ; eratina on shells in coll. Layard from Bredasdorp and Cape 

 Point. 



In the recently dispersed Layard collection was a tube labelled 

 "erateina" containing shells from Cape Point and Bredasdorp. 

 These were identical with original browningii in the Cambridge 

 Museum. Prionacis was differentiated by Benson from browningii 

 on account of larger size, less close plication, extending further down 

 on the underside, and wider umbilicus. All these points are con- 

 sistent with the increasing growth of the shell, young examples of 

 which are almost irnperforate, and show no basal sculpture. It 

 seems advisable to unite the three species, of which prionacis has 

 priority. 



268. TEACHYCYSTIS PYCNOTEICHA, Melv. & Pons. 



1899 Trachycystispycnotricha,M.&P.,\M.N.H.iv.-p.l97.-pL'3,i.7. D.F. 

 Type in British Museum. 

 Hab. CAPE OF GOOD HOPE. Kowie Eiver (Cox). 



269. TRACHYCYSTIS BAEIPLICATA (Benson). 



1849 Helix rariplicata, Bs.inMss.,Pfr., Zeitschr.f.Malak.vLp.71. D. 



1850 A.M.N.H. vi. p. 254. D. 



1853 Pfr., Conch. Cab. p. 323. pi. 129 (1852), 



f. 31-33. D.F. 



Eve., Conch. Icon. pi. 174, f. 1183. D.F. 

 Pfr., Mon. Hel. iii. p. 96. D. 

 1879 Helix (Pella) rariplicata, Bs., Binn., Ann. N.Y. Acad. Sci. i. 



p. 361. pi. 14, f. H. E. 

 1884 Pella rariplicata, Bs., Binn., Ann. N.Y. Acad. Sci. iii. p. 89. 



pi. 3, f. I. E. 

 1887 Helix (Pella) rariplicata, Bs., Tryon, Man. of Conch, iii. p. 107. 



pi. 20, f. 82. D.F. 

 Type in Stettin Museum. 



Hab. CAPE PENINSULA. Green Point Lighthouse (Benson ; 

 Layard). 



Examples presented to the British Museum as rariplicata by 

 Gibbons in 1876 have proved to be not that species, but sabuletorum. 

 As Binney obtained his specimens from Gibbons, his articles in all 

 probability refer to the last-mentioned species. 



