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290 MR. H. ADAMS ON NKW MASCARENE SHELLS. [May 14, 



lariter striata, olivaceo-fulva ; spira brevissime conoidea, apice 

 obtuso, sutura submarginata ; anfr. 6, planiusculis , ultimo antice 

 non descendente, supra subangulato, basi jmulum convexo ; apertura 

 subverticali, lunari ; perist . simplici, acuto, recto, mnrginibtis non 

 connivetitibus, columellari superne brevissime rejlexo. 

 Diam. maj. 9, min. 8, alt. 5 mill. 

 Hub. Isle of Bourbon. 



This species is closely allied to N. Virginia, Morelet ; but the 

 whorls of the spire are almost flat instead of being convex, and the 

 spiral lines are more strongly impressed, while the animal, from the 

 subjoined note of Mr. G. Nevill, appears to differ considerably. 

 "The animal is of a uniform black colour, and resembles that of 

 N. nitella ; that of N. Virginia is yellow and black." — G. Nevill. 



Discus serratus, H. Ad. (riate XXVIII. fig. 6.) 



D. testa late et profunde umbilicata, lenticulari, arctispira, tenur, 

 subpellucida, j)arum nitente, liris elevatis scvlpta, pallide htea ; 

 spira convexa, sutura serrata ; anfr. 6, convexiusculis, ultimo ad 

 peripheriatn serrato carinato, basi circa umbilicum rotunduto ; 

 apertura obliqua, angulato -lunari ; perist. simplici, acuto, recto. 



Diam. maj. 6|, min. .5|, alt. 3 mill. 



Hab. Silhouette Island, Seychelles. 



ACICULA MAURITIANA, H. Ad. (PI. XXVIII. fig. 7.) 



A. testa imperforuta, subulato-cylindracea, tenui, hyalina, nitida ; 

 spira subcylindracea, apice valde obtuso, sutura impi-essa ; anfr. 

 5, planiusculis, ultimo basi dilatato ; columella arcuata, vix trun- 

 cata ; apertura acuminato-ovali ; perist. simplici, recto, aciito. 



Long. 4, diam. 1 mill. ; ap. Ig mill. lonc;a. 



Hab. Mauritius. 



Vertigo (Al.ea) borbonica, H. Ad. (PI. XXVIII. fig. 8.) 



V. testa profunde rimata, oblongo-ovata, tenui, sublavigata, seri- 

 cina, rufo-fusca ; spira convexo-conica, apice obtuso, sutura im- 

 pressa ; anfr. 5, convexiusculis, ultimo basi subcompresso, pone 

 aperturam tumido, scrobiculato ; apertura truncato-ovali, subver- 

 ticali, quadridentata ; dente 1 compresso, intrant e in parietem aper- 

 turalcm 1 profundo in columella, 2 in palato, siipero minuto ; perist. 

 expansiusculo, albo-labiato, marginibus callo tenui Junctis, dextro 

 subsinualo. 



Long. 2|, diam. Ig mill. 



Hab. Isle of Bourbou. 



GiBBUS (Gibbulina) deshayesi, H. Ad. (PI. XXVIII. fig. 9.) 



G. testa profunde rimata, cylindrica, tenui, nitida, pellucida, oblique 

 leviter striatula, j^allide cornea ; spira superna convexa, obtusa, 

 sutura anguste marginata ; anfr. 9, convexiusculis, ultimo antice 

 ascendente, basi rotundato ; apertura verticali, seniiovali, denti- 



