GIBBUS. 87 



G. PALANGULA, Morelet. PI. 22, fig. 5. 



Narrowly rimate, closely striate, suture marginate ; light 

 yellowish ; columella plicate, parietal wall also with a small 

 plica, lip somewhat thickened. Length, 14 mill. 



Mauritius. 



This is G. productus, H. Adams, published two years later. 

 The name of palangula was printed by Ferussac on one of his 

 plates representing a different shell, but he did not describe the 

 species ; subsequently PfeiffeT described it under the name of 

 G. teres. This, it appears to me, allows Morelet 's name to stand. 



G. TERES, Pfeifler. PL 22, fig. 12. 



Shortly rimate, rather thin, obliquely plicate, diaphanous, 

 corneous white; lip thin, slightly expanded. Length, 10 mill. 



Mauritius. 



This is, according to Morelet, the figured but not described 

 Helix palangula, Fer. 



G. CYLTNDRELLUS, H. Adams. PL 22. fig. 11. 



Arcuately rimate, thin, obliquely costate, dirty white ; aper- 

 ture with a parietal lamella, lip shortly expanded and reflected. 



Length, 11 mill. 



Isle of Bourbon. 

 G. DESHAYESII, H. Adams. PL 22, fig. 10. 



Profoundly rimate, thin, pellucid, shining obliquely lightly 

 striulate, light corneous ; suture narrowly margined ; aperture 

 with small parietal tooth, lip scarcely expanded, sinuous. 



Length, 4'5 mill. 



Isle of Bourbon. 

 G. DUPONTIANUS, Nevill. PL 21, fig. 95. 



Openly rimate; yellowish corneous ; closely strongly obliquely 

 sulcate, the ribs wide and flexuous ; no parietal tooth, columella 

 plicate, peristome widely expanded, light yellowish. 



Length, 14'5 mill. 



Mauritius. 

 G. ADAMSIANUS, G. and H. Nevill. PL 21, fig. 96. 



Scarcely rimate, longitudinally costulate ; white ; aperture 

 with small parietal tooth, lip reflected. Length, 18 mill. 



Mauritius. 



