82 GIBBUS. 



Section PASSAMAELLA, Pfr., 1877. 

 G. PASSAMAIANUS, Petit. PL 17, figs. 29, 36, 37. Magnified. 



White, moderately solid ; aperture ear-shaped, the lip thin, 

 reflected, with a single or double tooth within, and a stronger 

 one on the columellar margin. Length, 11-12 mill. 



Socotra. 



Found on the south side of the island, on limestone rocks, at 

 nearly 1000 ft. alt. 



Section GONIODOMUS, Swains., 1840. 

 G. PAGODA, Fer. PI. 21, figs. 82, 83. 



Yellowish brown, often streaked with a deeper shade. 



Length, 33 mill. 



Mauritius. 



This is Pupa idolum, Menke, and Helix concamerata, Wood. 

 The young shell was described by Reeve as Helix Barclayana 



(fig. 83). 



Section PLICADOMUS, Swains., 1840. 



G. SULCATUS, Miiller. PI. 21, fig. 84. 



Brownish yellow. Length, 30 mill. 



Mauritius. 

 G. MULLERT, Morelet. 



Profoundly rimate, minutely plicate-costulate, calcareous ; 

 spire lengthened, apex obtuse, whorls 9 ; aperture vertical, 

 ovately rhomboidal, the margin thin^ slightly expanded. 



L. 30, diam. 15 mill. 



Mauritius (subfossil). 



Unfigured. Like G. sulcatus, but has one more whorl, longer 

 spire, and finer sculpture. 



G. NEWTONI, H. Adams. PL 21 , fig. 85. 



Profoundly arcuately rimate, obliquely finely costate ; light 

 yellowish. Length, 24 mill. 



Mauritius. 

 Section EDENTULINA, Pfr., 1855. 



G. OVOIDEUS, Brug. PL 17, fig. 18. 



Nearly smooth, whitish or yellowish white. Length, 2 inches. 



Madagascar, Ins. Mayotte. 

 Is Bulimus grandis, Desh. 



