Page:American Seashells (1954).djvu/333

Rh Subgenus Aurinia H. and A. Adams 1853 Scaphella dohrni Sowerby Dohrn's Volute Plate 13) Off the south half of Florida. 3 to 4 inches in length, similar to junonia, but much lighter in weight, much more slender, with a higher spire and with numerous exceedingly fine, incised (cut) spiral lines. Some specimens have the early whorls slightly angled and with short axial ribs. This is the form named florida Clench and Aguayo and is probably not a good species. A rare species which is appear- ing in private collections more and more. Scaphella dubia Broderip Dubious Volute Off south half of Florida and the Gulf of Mexico. 4 inches in length, similar to dohrni, but more slender, with fewer spots, and with 6 to 7, instead of 9 to 10, rows of spots. A rare and exquisite spe- cies from moderately deep water. Scaphella schmitti Bartsch Schmitt's Volute Plate 136 Off Tortugas, Florida. 5 inches in length. Under the brownish periostracum the shell is chalky, pale salmon and with 4 or 5 spiral rows of weak, brown, square spots. A thick, yellowish-gray glaze overlays the periostracum on the parietal side of the body whorl. Columella straight, while in R. georgiajia Clench from Georgia to east Florida it is arched. Both quite rare, the former in 80 fathoms of water. The genus Rehderia Clench 1946 was unfortunately erected upon an ecological or pathological character and should be considered a synonym of Scaphella. Genus Arctoinelon Dall 191 5 (Boreomelon Dall 191 8) Arcto7nelon stearnsi Dall Stearns' Volute Alaska. 4 to 5 inches in length, strong; exterior chalky-gray with mauve-brown undertones. Aperture semi-glossy, light-brown. Columella brownish with 2 moderately large folds and a weak one below. Nucleus bulbous, chalky- white. Uncommon offshore down to 100 fathoms.