Syto. Helix (Cochlitoma) sp. Fer., Rang. 

 Liguus sp. Gray. 

 Achatina (Chersina) sp. Beck. 

 Bulimus (Limicolarius) sp. Beck. 

 Achatina sp.Desh., Pf., Beeve, etc. 

 Bulimus sp. Lam., Pf., Beeve, etc. 

 Achatina (Archachatina) sp. Alb. 



„ (Corona) sp. Alb. 



Pseudotrochus sp. H. et A. Adams. 

 Obs. Genus naturale, peristomatis et columelke characteribus 

 Chersinae Hiimph. Beck, habitu et pictura Limicolariae affine, 

 Species plurimas pulcherrimas, aegre discriminandas, omnes 

 Silvas Africa? occidentalis tropica? incolentes, ab auctoribus tarn 

 ad Btdimum quam ad Achatinam relatas, includens. 



1. Perideris Alabaster. 



Syn. Helix (Ctoma) Alabaster Rang Ann. Sc. Nat. XXIV 



(1831) p. 20 t. 1 f. 2, 2 a. 

 Achatina „ Desh. in Lam. ed. 2 a. 



VIII p. 812 N°. 84. 

 „ Beeve Conch. Syst. II t. 



118 f. 9, et Mon. t. 9 N°. 28. 

 Pf. Mon. II p. 247 N°. 9, 

 III p. 479 N°. 8. 

 Desh. in Fer. Hist. II P. 2 

 p. 150 t. 124 f. 7, 8. 

 „ (Chersina) „ Beck. Ind. p. 74. 



„ (Archachatina) „ Alb. p. 190. 



Hab. He du Prince (Rang, Pictet ! Cuming!). 

 Obs. Sutura anguste albo-marginata , vix crenulata; epider- 

 mis sub forma fasciaß angustae peripherica? castaneae persistens. 

 Specimina quatuor exstant, quorum dua cum ovis et embryonibus. 



2. Perideris tenuis. f 



Syn. Liguus tenuis Gray in Zool. Proc. 1884 p. 66. 

 Bulimus (Limicolarius) tenuis Beck p. 60. 

 Achatina tenuis Pf. II p.247 N°. 16, III p. 480 N°. 11. 



Hab. Africa? (Gray.) 

 Obs. Species omnino dubia, huc tantum e patria relata. 



