288 AMERICAN JOURNAL 



Striate, and also marked by lines of growth, radiatcly, obsoletely, 

 broadly and distantly ribbed, interior roughened by small radia- 

 ting ribs ; upper side "white, covered with a thin membranaceous 

 epidermis, beneath in the centre dark chestnut-brown, muscular 

 impression yellowish, bordered by a concentric band of chestnut- 

 brown, outer edge yellowish. 



Dr. Gould, in "Report Am, Expl'g. Exp.," proposed to adopt 

 the name of 0. umhellatum, Gm., for the above species. Gmelin's 

 description, however, docs not apply, and was undoubtedly drawn 

 up from a specimen of 0. Indicum. No specimens of shells had 

 reached Europe from the HaAvaiian Islands in his day. This 

 species is distinct both as to shell and animal. The latter when 

 living is of an orange-yellow, the whole surface covered with tu- 

 bercles, a character not mentioned in any description of 0. In- 

 dicum. The shell on its upper side is finely striate concentri- 

 cally, not radiately as O. Indicum, as well as more prominently 

 marked by lines of growth. The radiating ribs are scarcely 

 perceptible. The right side is much more elevated than the op- 

 posite, probably to accommodate the branchiae. The color of the 

 interior differs from both 0. Indicum and 0. Cumingii, Desh., of 

 which I have specimens. The latter is more nearly connected 

 with the Mediterranean form. 



The animal of the above attains the size of eight inches in 

 length, of which the shell covers five and a half. 



SCALARIA PERPLEXA, PcaSC. 



Description. — T. pyramidali-elongata, solida, imperforata, ni- 

 tida, alba, fascia fusca ad suturas ; anfr. 9-11 rotundatis, laevi- 

 bus ; anfr. ultimo costa spiralis ad inferiorem partem ; sutura 

 profunde impressa; varicibus 9-10, prominentis, irregularis, 

 compressis ; apertura abbreviato-ovalis. 

 Dimensions. — Long. 32, diam. 13 mill. 

 Locality. — Hawaii. 



Shell pyramidally elongate, solid, imperforate, shining, ivory 

 white, dark brown at the sutures ; whorls 9-11, rounded, smooth, 

 rather rapidly enlarging, the last with a, spiral rib encircling the 

 axis ; suture deeply impressed ; varices 9-10, prominent, com- 

 pressed, irregular in size, more or less continuous ; aperture 

 abbreviately oval. 



We attach the above name to this species for reason of its 

 having been so long confounded with S. clatlirus. The whorls 

 are more rounded, and it differs in color from that species. Very 

 rarely the whole space between the varices is colored dark 

 purplish- brown. 



