MAROARITA-SOLARIELLA. 307 



sculpture of strong revolving threads, of vvliich that nearest to the 

 suture is most pronounced, and continues, at first sharp, then with 

 slight waves, then with oblique waves like the " lay " of a stranded 

 rope, and on the last whorl as a succession of well-elevated pinched- 

 up points forming a band next the suture; the others disappear on 

 the third whorl, and for tlie re-^t the shell is only marked hv faint 

 lines of growth here and there, a little more pronounced in the vicinity 

 of the umbilical calli's; jjc .iphery with a tendency to carination, 

 base rounded ; aperture oblique, rounded, margin sharp, simple, 

 pillar stout, thick, inseparable from a thick white callus which forms 

 a lump over the umbilical pit; end of pillar (broken in specimens 

 seen so tar) ajjparenti}' forming a sort of lump or thickened an'>-le. 

 Suture distinct throughout. 



Alt. O'To, major diam. 6, diam. of aperture, 8 mill.; dett. some- 

 what less than 90°. {Ddll.) 



Gulf of Mexico off Calebra LI., etc. 890-805 fms. ; uho North 

 Atlantic. 



MJ empira Dall. Bull. M. C. Z. ix, p. 44, 18«1.— J/. (Buthymo- 

 phlla) euHpira and var. nitens Jeff, (nis.) Dall, I. c, p. 102 ; Bull. M. 

 C. Z. xviii, p. 878, t. 32, f. 8, \^m.— Trochas (O.qistele) euspira Dall 

 Jeffreys, P. Z. S. 1888, p. 98, t. 20, f. 6. 



The diam. of my largest specimen is about 9 mill. This pretty 

 shell is extremely variable as regards the height of the spire and the 

 sculpture. Some specimens are quite smooth ; others are spirally 

 striated throughout. Or on the body whorl only, or on the upper 

 wh(jrls, or ruund the umbilicus; some (var. coroiuita) have a row of 

 beads below the suture. In all ui}- specimens there is a minute 

 tubercle on the broad and fretted pillar juei/r its base, but not at its 

 base. ^ ;!< ^ The young are always umbilicate. {Jeffr.) 



Subg3nas SOLARIELLA Searles Wood. 



Solarlella Searles Wood, Cat. shells from the Crag, in Ann. and 

 Mag. Nat. Hist., ix, p. 531 (1842). Type, S. viaculata S. Wood. — 

 Carpenter, Proc. Cal. Acad, iii, p. 157. — Fischer, Manuel de 

 Conch., p. 826 (not Solarlella Adams, Gen. Rec. Moll. p. 431, = 

 Mlnolla Ad.). — Solarlella ' A. Ad.' Dall, Bull. M. C. Z. xviii, 

 p. 378. — Machceroplax Friele, Tungebevsebningen hos de Norske 

 Rhipidoglossa, in Archiv f. Mathematik og Naturvidenskab, Chris- 

 tiana, ii, p. 311, 1877. — Sars, Moll. Reg. Arct. Norv., p. 136, 1878. 

 Type, M. affxal-i Jeffr. 



