ACADEMY OF SCIENCES. 203 



produced into a short, slightly-twisted canal ; aperture oblong, ovate, tawny- 

 yellow and lyrate within ; columella with several small nodules. 



Length, sixteen mill. 



Habitat, Samoa and Yiti Islands. 



A very rare sjiecies found under stones on reefs. 



Genus Engina, Gray. 

 Engina alternata, Grt. 



Shell abbreviately fusiform, solid, rapidly tapering towards the base ; longitu- 

 dinally ribbed ; ribs slightly nodular, the sutural row of nodules the larger ; 

 spire sliort, pointed ; whorls seven or eight, the last one ventricose, longitudi- 

 nally striated and spirally grooved ; aperture little more than half the length of 

 the shells ; outer lip thick, crenulate, sinuous above and toothed within ; col- 

 umella somewhat flattened, slightly grooved on the edge and furnished with a row 

 of papilla; ; parietal region Urate. Color : ribs white, under a pale luteous epi- 

 dermis, and the interstices deep brown. Fauces white or livid. 



Length, fourteen mill. 



Habitat, Samoa and Viti Islands. 



A very rare species found under stones on reefs. 



Engixa gibbosa, Grt. 



Shell small, ovate rhomboid, rather thick, light brown, with pale transverse 

 ridges ; whorls seven or eight, flatly convex, the last one gibbose, longitudi- 

 nally, stoutly ribbed ; ribs rounded, ten or twelve in the body-whorl, crossed 

 by small transverse ridges and elevated stria; ; base much contracted and slightly 

 recurved ; aperture nearly half the length of the shell ; outer lip wilh five teeth ; 

 columella slightly rugose. 



Length, eight mill. 



Habitat, Viti and Samoa Islands. 



Not uncommon under stones on reefs. 



Engina Bella, Grt. 

 Shell oblong ovate, sub-fusiform ; apex acute, base contracted and slightly 

 twisted ; whorls eight, flatly convex, last one gibbose, longitudinally nodosely- 

 ribbed ; ribs stout, rounded ten to eleven on the body-whorl ; interstices decussated 

 with raised stria; ; aperture less than half the length of the shell ; outer lip with five 

 small teeth on the inner edge, and the columella slightly rugose ; color ashy- 

 white, with three transverse white bands, the upper one following the suture, 

 and the nodules between the bands yellowish, with i)rown margins. 

 Length, six mill. 



Habitat, Yiti and Samoa Islands. 



A very rare and handsome species found on the outer reefs. 



Genus Fissurella, Bfug. 

 FiSSURELLA foveolata, Grt. 

 Shell depressly conical,^blong, oval, rarely ovate, ashy-white, more or less mot- 

 tled with slate color; radiately ribbed, ribs closely-set, prominent, alternately 

 larger and smaller, from thirty to thirty-two in number, intersected by close con- 

 centric thin ridges, and the interstices deeply punctured ; fissure a little anterior, 

 I'uof. Cat-. Acad. Sci., Vol. IV.— 15 January, 1872. 



