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Show 1868.] MR. H. ADAMS OAN NEW MASCARENE SHELLS. 291 culo parietali munita; perist. vix expanso, marginibus remotis, callo tenui junctis, dextro sinuato. Long. 4g, diam. 2 mill. Hab. Isle of Bourbon. GIBBUS (GIBBULINA) MORELETI, H. Ad. (Pl. XXVIII. fig. 10.) G. testa rimata, ovato-cylindracea, solidiuscula, oblique confertim striata, sordide alba; spira cylindracea, apice obtuse conico, sutura submarginata; anfr. 7\, planiusculis, ultimo basi compresso, antice leviter ascendente; columella calloso-plicata; apertura parum obliqua, subtruncato-ovali, dente parietali nullo; perist. expanso et reflexiusculo, marginibus subparallelis, columellari paulum dilatato, patente. Long. 11, diam. 4| mill.; ap. 4 mill, longa, 2 | lata. Hab. Silhouette Island, Seychelles. GIBBUS (GIBBULINA) CYLINDRELLUS, H. Ad. (Pl. XXVIII. fig. 11.) G. testa arcuato-rimata, cylindrica, tenui, oblique costata, sordide alba; spira supra medium paulo latiore, turn in conum brevem obtusum terminata, sutura mediocri; anfr. 10, subplanatis, ultimo leviter ascendente, basi compresso ; apertura verticali, truncato-ovali, dente parietali valido compresso munita; perist. breviter expanso et reflexo, marginibus subparallelis, callo tenui junctis. Long. 11, diam. 3| mill. ; ap. 3 mill, longa, 2 lata. Hab. Isle of Bourbon. ENNEA (ELMA) NEVILLI, H. Ad. (Pl. XXVIII. fig. 12.) E. testa imperforata, subcylindrica, solidula, nitidula, obsolete striata, albida; spira elongata, sursum attenuata, apice obtuso, sutura marginata; anfr. 9, planiusculis, ultimo basi rotundato; columella vix torta, callosa; apertura verticali, subovali, antice leviter ascendente; perist. tenui, breviter reflexo, margine dextro flexuoso, ad insertionem attenuato, basali cum columellam angulum obtusum formante. Long. 20, diam. 5 mill. ; ap. 6 mill, longa, 3| lata. Hab. Seychelle Islands. The species upon which I founded the subgenus Elma, viz. E. swinhoei, although an African form, was collected by Mr. Swinhoe in the Island of Formosa, where I presume it must at some remote period have been introduced. The other species known at the time were from Prince Edward's Island. Another, however, has been since described by Dr. Dohrn, also from the latter locality; and he, at the same time, created a genus, under the name of Strepstostele, to receive it. It is therefore of much interest to find an example inhabiting the Seychelles. CYATHOPOMA BLANFORDI, H. Ad. (Pl. XXVIII. fig. 13.) C. testa aperte umbilicata, depresso-turbinata, lirulis confertis cincta, |