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MAGILIDAE 219
Aperture white. Exterior white to Hght-brown. Common in the Puget
Sound area and to the north on rocks near shore. Also down to 35 fathoms.
Appears in some books as Purpura or Ceratostoina foliatum Martyn.
Pterorytis nuttalli Conrad Nuttall's Thorn Purpura
Plate 14
Point Conception, Cahfornia, to Lower Cahfornia.
1/4 to 2 inches in length, similar to Pter. foHata (and somewhat resem-
bling Ocenebra poulsom)^ but with much more poorly developed varices,
and with one prominent, noduled rib between each varix. Spine on outer lip
usually long and sharp. Exterior yellowish brown, sometimes spirally banded.
Siphonal canal closed along its length. A common littoral species in the
southern part of its range.
Genus Eupleiira H. and A. Adams 1853
Eupleura caiidata Say Thick-lipped Drill
South of Cape Cod to south half of Florida.
Figure 47b
/4 to I inch in length; apex pointed; siphonal canal moderately long,
almost closed, coming to a sharp point below. Last varix large, rounded and
with small nodules. Inside of outer lip with about 6 small, bead-like teeth.
Whorls with spiral cords and strong axial ribs. Th-^re are 4 to 6 axial ribs
between the last 2 varices. E. etterae B. B. Baker is a large, ecologic form of
this species.
Eupleura sulcidentata Dall Sharp-ribbed Drill
West coast of Florida.
Figure 47c
Similar to E. caudata, but with the spiral sculpture almost absent. There
are only 2 or 3 axial ribs between the last 2 varices. The varices are thin and
sharp, and the entire shell is slightly compressed laterally (has a more oval
outline from an apical or top view than does caudata). The axial ribs are
often sharp and may bear a small spine at the top. Color gray, chocolatebrown,
tan or rarely pinkish, and sometimes with a narrow spiral brown
band. Moderately common. E. stimpsoiii Dall from deep water in the Gulf
of Mexico is figured on p. 209.
Family MAGILIDAE
Genus Coralliophila H. and A. Adams 1853
CoralUophila abbreviata Lamarck Short Coral-shell
Southeast Florida and the West Indies.