As Margarita scabriuscula (Dall, 1881):
Shell white, conical, compact, very thin, with a silky lustre ; whorls, five to six, suture not channelled ; nucleus bulbous, polished, smooth ; next whorl and a half having a sculpture of slightly raised ribs like a minute Scalaria; on the following whorls the upper surface decorated with two carinae, sculptured With closely set, angular, buttressed projections, like those figured by Watson on the carinae of Trochus clavatus , but the buttresses are not continuous over the whorl, so as to form transverse ribs, and the second carina is within the periphery of the last whorl, which is bordered by a sharp, angular carina, without nodules or projections ; two similar, but lightly nodulated, intervene on the somewhat rounded base between the last and the nodulated boundary of the umbilical chink, which is nearly filled by the reflected pillar ; the lines of growth radiate in a wavy manner from the umbilicus over the whorl, and constitute the remaining sculpture ; there are no longitudinal striae of any kind, or any ribs except those described ; the aperture is nearly rectangular, a little wider than high ; the sides of the spire are rather a little inflated than simply conical. Alt. 4.75. Lat, of base, 4.0. Lat. of aperture, 1.62 ; alt. 1.12 mm. This has the characteristic aspect of an abyssal shell.

Solariella tiara: Shell small, thin, spire rounded conical, of 6 to 7 whorls. Protoconch bulbous, glassy, of 1 whorl. Spiral sculpture of, on the spire 2, on the last whorl 3 carinae, each set with numerous strong, conical tubercles. The upper carina is separated from the suture by a narrow flat area and is on the same level as the suture, the second is just below mid-whorl and forms the periphery, and the third, on which the suture forms, defines the base, Base with 3 to 4 spiral cords whose sculpture ranges from weakly undulate to fairly distinctly beaded; the innermost cord is strongly beaded and bounds the umbilical depression. Axial sculpture of sharp riblets on the first 2 whorls persisting on later whorls as low ridges between the carinae, irregularly connecting tubercles on adjacent carinae. Otherwise, there are fine, crowded, irregular growth lines over the whole surface. Base flatly rounded, with a shallow central depression, at the center of which is a small umbilical pore which is reduced to a chink in most specimens. Aperture subrectangular, slightly thickened within; lips thin, inner lip slightly reflected; columella thickened, sometimes more so in the middle, forming an obscure tooth.

Solariella tiara: As can be seen in the synonymy, this species has been cited frequently since its description. However, no one has compared specimens of tiara with the holo-type of scabriuscula, the only known specimen of that species. Instead, authors subsequent to Dall merely quoted from the litera-ture. In trying to identify specimens from the Straits, I examined the holotype of scabriuscula and compared it with a photograph of one of the syntypes of tiara; I found no characters on which to base a separation at the specific level. A subsequent examination of specimens taken by the PILLSBURY from the Caribbean supported my belief that the two species are in fact the same. This species has been placed in the genus Solariella by most authors since Dall, but in my opinion, it does not belong there at all. I can find no described group in which tiara fits, and so assign it to a "genus uncertain" rank.

Solariella tiara: Known from Bermuda, the Straits of Florida, the Gulf of Mexico, and the Caribbean, especially the Antilles,
Bathymetric range: This species has been taken in depths of 400-1966 m. It seems to be most frequent in the 600-800 m range.