452 A.B. Verritt— Catalogue of Marine Mollusea. 
Pleurotoma Carpenteri Verrill and Smith. 
Plewrotoma Carpentert Verrill and Smith, in Verrill, Amer. Journ. Sci., xx, pp. 391, 
395, Nov., 1880; Verrill, Proc. U. S. Nat. Mus., p. 368, 1880. 
Ppate LVII, FIGURE 2. 
Shell rather small, solid, slender; surface glossy, without spiral 
lines, but with distinct lines of growth. Whorls eight, somewhat 
convex, scarcely shouldered, crossed by about twelve strong, ele- 
vated, decidedly flexuous, smooth, rounded, longitudinal ribs, which 
are highest just below the subsutural band, and extend entirely across 
the upper whorls, and on the body-whorl from near the suture to the 
middle, below which the surface is smooth; the interstices between 
the ribs are deeply concave, wider than the ribs, and perfectly smooth, 
except for the faint, but evident, lines of growth. Nucleus rounded, 
without sculpture, shining white. Outer lip thin, the edge sharp, pro- 
jecting forward and rounded in the middle, with a broad, rounded 
sinus, a little below the suture. Aperture rather small, oblong-ovate ; 
‘anal short, straight, a little narowed by an incurvature of the lip, at 
its base; columella nearly straight, thickened by a layer of enamel, 
which forms externally a distinct ridge, or margin. Color, white or 
pale yellow, often with darker brownish orange ribs. Length, 7; 
breadth, 2°75"". Animal not seen. 
Only a few specimens were taken in 1880, at stations 870 to 873, 
in 86 to 155 fathoms. Several were dredged in 1881, at station 949, 
in 100 fathoms. 
Pleurotoma comatotropis Dall. 
Pleurotoma (Mangilia) comatotropis Dall, Bulletin Mus. Comp. Zool., ix, p. 58, 1881. 
Differs from all our other species in having strong spiral ribs and 
grooves on the lower whorls. 
One dead specimen. Off Martha’s Vineyard, station 949, in 100 
fathoms. Off Cape San Antonio, 640 fathoms (Dall). 
Daphnella limacina Dall. 
Plewrotoma (Bela) limacina Dall, Bulletin Mus. Comp. Zool., ix, p. 55, 1881. 
Pleurotoma (Daphnella ?) limacina Verrill, Amer. Journ, Sei., xxii, p. 300, Oct., 1881. 
Daphnella limacina Dall, op. cit., p. 102. 
Shell delicate, translucent, glassy white, ovate-fusiform, acute at 
both ends. Whorls nine, slightly convex, with a small, nodulous, 
