330 SOLARIELLA-TUR( K II, A. 



S. SCABRIUSCULA Ball. PI. 51, figs. 28, 29. 



Shell white, conical, compact, very thin, with a silky luster; 

 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 cariiue, sculptured with closely set, 

 angular, buttressed projections, like those figured by Watson on the 

 caring of Trochus clavatus (PI. 5, fig. 8), 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 rarina, without nodules or projections; 

 two similar, but slightly 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 stria3 of any kind, nor 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, diam. of base 4; hit. of aperture Mi'J alt. I'll* mill. 

 (Da//.) 



Gulf of Mexico, Southern part, 539 in is. 



Margarita scabriuscula DALL, Bull. M. C. Z. ix, p. 41. Solariella 

 scabriuscula DALL, * Blake' Rep. Gasterop., Bull. M. C. Z. xviii, p. 

 379, t. 21, f. 10.- 



Subgenus TURCICULA Dall, 1881. 

 Tureicula DALL, Bull. M. C. Z. ix, p. 42, 1881. 



T. TMPERIALIS Dall. PI. 49, figs. 29, 30. 



Shell with five (?) whorls, globosely conical, white, extremely 

 thin; umbilicus reduced to a mere chink under the thin callus of 

 the upper part of the pillar lip. Mouth rounded rectangular, pillar 

 somewhat concave, margins all thin; base flattened convex, with 

 seven revolving ribs, the outermost of which is just within the periph- 

 ery, crossed by radiating lines of growth, regular and very fine, but 

 raised into low, very sharp lamellae which pass over the periphery 

 onto the upper surface of the whorl ; the last is provided with two 

 strong revolving ribs, one of which forms the periphery, while the 

 other lies a little less than half way from the first toward the suture ; 



