34 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Testa ovata, superne aciiminata, vix rimata, nitida, nigro-castanea, 

 infra suturam zona pallida cincta, ad apiceni nigra ; spira elongata, 

 conica, ad apiceni rotundata ; anfractus 6^, superiores 2^ convexi, 

 cseteri minus convexi, lineis incrementi tenuibus striisque spiralibus 

 exilissimis inconspicuis scnlpti, ultimus antice vix descendens ; 

 apertura invei-se auriformis, intus purpnrascens, longit. totius ^ paulo 

 minor ; labrum tenue, nigro-piirpureo limbatum, hand expansum ; 

 colnmella in medio incrassata, reflexa, obliqua. Long. 20, diam. 

 9 mm. ; apertura 9 longa, 5 mm. lata. 



Hob. — Aldabra Island, north of the Comoro Islands. 



"Yery rare, only found in one spot about an acre in extent." 

 Allied to B. Bewslieri, Morelet, from Anjouan, Comoro Island, but 

 differing in form, etc. The specimens described were presented to the 

 national collection by the llev. J. W. Horsley. 



4. DiPLOMMATiNA Whiteheadi, n.sp. PI. II, Pig. 26. 



Testa minuta, sinistrorsa, pupoidea, alba, ad apicem rufescens; 

 anfractus 4-5, apicales 1^ rotundati, Iseves, cgeteri perconvexi, costellis 

 tenuissimis obliquis numerosis instructi, inter costellas microscopice 

 confertim spiraliter striati, penultimus magnus, ultimo major, ultimus 

 supra aperturam constrictus ; peristoma duplex, margine intern o 

 continue, leviter porrecto, externo anguste expanse, supra interrupto, 

 columellari dente minuto in medio munito. Long. 1*25, diam. '75 mm. 



Sal. — Kina Balu, North Borneo. 



A very minute, but, under the microscope, very beautiful species. 

 Although described as smooth, the apical whorls ai'e in reality micro- 

 scopically punctate. The costellse become a trifle more remote upon 

 the last than preceding whorls. 



