172 Marine Shells of the Western Coast of Florida 



Blind Pass, Sanibel Island. Many shells are taken by the sponge 

 divers of Tarpon Springs. S. junonia has been taken in eight fathoms 

 from Tampa Bay to the Florida keys and one living specimen was 

 dredged in the Gulf Stream off Palm Beach, Florida. 



Subgenus AURINIA H. and A. Adams, 1853 

 Aurinia kieneri ethelae Pilsbry and Olsson PI. 53, fig. 355 



Alt., 182 mm.; greater diam., 54.5 mm. Shell spindle-shaped, 

 not thick; pinkish cinnamon, with six widely separated, revolving 

 rows of squarish spots of dark brown; spire a little over one whorl, 

 with an elevated, acute point; about five whorls, the first two with 

 about 17 narrow axial riblets, which diminish rapidly on the next 

 whorl; spiral sculpture strong, except on body whorl which is nearly 

 smooth except for longitudinal lines of growth; aperture two-thirds 

 of length of shell; outer lip thin and flattened, the lower edge 

 sharply curved to the notched canal; columella straight and smooth, 

 without plaits; operculum missing. Dredged in the Gulf from 

 Mississippi, as far south as Tampa. 



This is a longer, thinner and more graceful shell than Scaphella 

 junonia, differing especially in its lack of oblique folds on the col- 

 umella.* 



Family 3IARC;OELLIDAE 



The mollusks of this family are small sand dwellers, living only 

 in warm seas with a range in depth from the intertidal zone to a 

 thousand fathoms. 



Many of the animals are beautifully marked with spots of bril- 

 liant color; the foot is large, the siphon long and the mantle is re- 

 flected over the greater part of the shell. 



The shells are highly polished, porcelanous, with an extremely 

 short spire and large rounded body whorl. The aperture is long 

 and narrow, the outer lip thickened and the columella is always 

 plicate. Operculum usually absent. 



Genus MAKGINELLA Lamarck, 1799 

 Marg-Inella apicina^i-' Menke PI. 36, fig. 242 



Alt., 12 mm. Shell small, smooth, polished; ivory or yellow, 



3^- Lat., dim. of margo, rim, margin; apex — ids, apex. 



* Pilsbry, H. A. and Olsson, A. A.: Nautilus, vol. 67(1). Condensed de- 

 scription. 



