324 SOLARIELLA. 



simple not thickened ; operculum thin, corneous, multispiral ; shell 

 nacreous, with delicate suffused splashes of brown. 



Alt. 5, maj. diam. 5'5. Diam. of aperture, 2 ; of umbilicus, 2*75 

 mill. (Dall) 



Sand Key, 119 fms. 



Margarita iris DALL, Bull. M. C. Z. <ix, p. 43, 1881. Solar iella 

 iris DALL, Bull. M. C. Z. xviii, p. 382, t. 21, f. 7, 1889. 



Only one specimen of this form has been found. The upper sur- 

 face much resembles that of S. lacunella, but the base, especially the 

 umbilicus, is altogether different, the shell is thinner and much 

 more pearly, and the spiral lines are much finer. (Dall.) 



S. LTJBRICA Dall. PI. 51, figs. 25, 26. 



Shell small, conical, white, shining, with a slight nacreous hue ; 

 whorls five full and rounded ; suture distinct ; from about the begin- 

 ning of the third whorl a row of round nodules, extends along the 

 upper line of the whorls just below the suture, about twenty-five on 

 the last whorl and more faintly defined near the aperture ; base per- 

 forated by a small umbilicus bounded by a thickened raised line, 

 within which are about twelve plications extending up into the 

 umbilicus ; outside of this line a few radiating impressed lines extend 

 toward the outer part of the whorl ; faint lines of growth are here 

 and there visible on the polished surface ; aperture nearly circular, 

 thin edged, simple ; the pillar slightly extended on the umbilical 

 side, not thickened. 



Alt. 4, maj. diam. 3*25. Diam. of aperture T5 ; of umbilicus '5 



mill. 



Off Santa Lucia, 115 fms. 



Margarita lubrica DALL, Bull. M. C. Z. ix, p. 44, 1881. Solariella 

 lubrica DALL, Bull. M. C/Z. xviii, p. 382, t. 21, f. 9. 1889. 



Var. iridea Dall. Shell without the coronation at the suture or 

 only slight traces of it, umbilical carina less strong, umbilicus 

 smaller, whorls inflated, very round, brilliantly pearly, base wider 

 than in the type. (Dall.) 



This extremely lovely little shell, when fresh, has a most brilliant 

 greenish nacre shining like a diamond beetle. The variety was 

 dredged by the U. S. Fish Commission off Cape Florida in 193 fms. 

 (Dall) 

 S. RHYSUS Watson. PI. 66, figs. 9, 10. 



Shell small, conical, scalar, with rounded base and large um- 

 bilicus, sculptured. Sculpture : spirals there is a double, tubercled 



