182 DRILLIA. 
suture, usually constricted or almost closed at the edge of the 
lip, but broadly rounded at the extremity. Length, 19°5 mill. 
Martha’s Vineyard, 94 to 146 fms. ; 
off Delaware Bay, 104 fms. 
Animal and operculum not observed ; the generic position is 
therefore very uncertain. It is described simply as a Pleu- 
rotoma. 
Unfigured Species. 
D. pyrrua, Watson. (Related to lanceolata, but more stumpy.) 
Japan. 
D. steRRHA, Watson. N. Australia. 
B. Pustonelleformes. 
These shells are very like Pusionella in form, but differ in the 
surface and in possessing the normal operculum of Pleurotoma ; 
they differ also from the typical Drillizw in wanting the callus 
deposit on the upper portion of the labium. Any one who is 
fond of minute divisions of the genera has here a chance to 
distinguish himself by instituting a new subgenus. 
D. INERMIS, Hinds. PI. 12, figs. 43, 40; Pl. 32, fig. 42. 
Pinkish ash-colored under a light olivaceous epidermis, the 
lines of growth, which are sometimes rib-like, oblique and angu- 
lated at the periphery and lighter-colored, so that the interspaces 
appear like angulated lines of chestnut or reddish narrow stripes; 
whole surface covered by close revolving incised lines. 
L. 38, diam. 13 mill. 
Southern California, L. California. 
D. penicillata, Carpenter (fig. 40), described from beach-worn 
specimens, having the same general form as the above, as well 
as its peculiar coloring, was supposed to differ principally in 
having stronger and fewer plications. I can find no good char- 
acters by which to distinguish it. The shell which Weinkauff 
figures for D. inermis is not that species. 
D. 1nctsa, Carpenter. Pl. 12, fig. 41. 
Shell in general form like the preceding species, but smaller, 
the whorls somewhat more rounded; cinereous, with reddish 
chestnut revolving lines. L. 1-13, diam. -4 in. | Puget’s Sound. — 
