410 On the Land Shells of Bourbon. [No. 4, 



My numerous specimens of this variety all have the above 

 measurements, agreeing with those given by Pf r. loc. cit., except 

 as regards the aperture, to which he ascribes 2£ in length and 1 

 in breadth. I purpose speaking of the other Mauritian species of 

 this sub-genus in another paper, which I hope to publish shortly, 

 on the land shells of Mauritius. 



19. Bulimus ventjstus, M o r 1 1. Journ. de Conch. 1861. 



I found no species of this genus, and think it possible M a i 1 1 a r d 

 may have, by accident, sent some shell from the Comoro Is. to 

 D e s h a y e s, who has recorded this species from Bourbon. 



20. Exxea bicolor, Hutt., J. A. S. Beng. ; III, p. 93. 



I believe myself that this little species has been introduced hero 

 amongst the roots of shrubs, &c, as well as into Mauritius, the 

 Seychelles &c. ; I have always found it in all these islands near the 

 sea, in other words where there has been a great deal of cultivation. 



21. Gibbxjs (Gibbulina) entersecta, D e sh., Moll, de la Keun. 

 p. 91, (? var. of Bourguiijnati, Des h.). 



I think this species is very doubtfully distinct from the following, 

 of which I found some undoubted varieties approaching, by a 

 slight diminution in the convexity of the whorls, very closely to 

 Deshayes' figure of the present species. 



22. Gibbus (Gibbulina) Botjrguignati, Desk, ibid p. 90. 

 (bacillus, Pfr. var.). 



I have hesitated some little time, whether to accept this species 

 or not, it only differs from the Mauritian G. bacillus, P f r., by 

 its slightly smaller proportions and by a very marked difference 

 in the sculpture, which in this species is very fine, hardly dis- 

 cernible except under the lens, whereas it is coarse and very 

 distinct in G. bacillus, this characteristic has decided me on re- 

 taining the species ; the animals are hardly distinguishable. I 

 should have described the colour of the animal of G. bacillus as 

 c yellowish inclined to green" in my description in Zool. Soc. 

 Proc. 1868, p. 259, that of the present species is a decided yellow, 



