454 A. EL Verrill— Cataloque of Marine Mollusca. 
Y , 
The color of all the specimens is delicate, pale, yellowish brown, 
or salmon, nearly uniform throughout, except for the darker brown 
nucleus, 
The teutacles are tapered, with a swelling on the outer side, near 
the base, but have no eyes; the penis is very large and long, round, 
nearly cylindrical, except near the tip, where it tapers; in alcoholic 
specimens it is nearly as thick as the neck, from which it arises. 
The uncini of the odontophore are long-lanceolate, acute, with a 
tooth on one side, near the middle, but without terminal barbs; 
basal process (manubrium) large, somewhat bilobed., 
An immature female has the whorls somewhat more convex and 
more evenly rounded, or less shouldered, and the transverse ribs 
smaller and less elevated than in the example originally described, 
which was a male, (fig. 9). In this female, the spire is also slightly 
less acute, but otherwise the shell does not differ in the two sexes. 
The length of this specimen is 13"; greatest breadth, 6; canal and 
body-whorl, in front, 9°5. The original male is 21°5™" long, 11°5 
broad ; canal and body-whorl, 15"™ long. 
This shell is much thinner and far more delicate than the two fol- 
lowing species, from which it also differs in having a much deeper 
sinus, more convex whorls, a narrower canal, and much finer seulp- 
ture. 
Gulf of Maine, 110 fathoms (S. 89, Bache), 1872; 105 and 110 fath- 
oms (8. 51, 54, B.), 1874; 85 fathoms (S. 189), 1878; off Cape 
Cod, 96 fathoms (S. 378), 1879. 
Pleurotomella Agassizii Verrill & Smith. 
Plewrotoma (Pleurotomella) Agassizii Verrill & Smith, Amer. Journ. Sci, xx, p. 394, 
for Nov.. 1880 (published Oct. 25); Verrill, Proce. U. S. Nat. Mus., iii, p. 367, 
1880. 
PLATE LVII, FIGURES 3, 3¢. 
Shell rather large and solid; whorls eight or nine, convex, angu- 
larly shouldered, with sixteen to eighteen thick, rounded, oblique 
ribs, separated by concave interspaces; the ribs do not extend above 
the shoulder, leaving a rather broad, flattened, or concave, subsutural! 
band, which is covered by fine, raised, revolving lines, more or less 
decussated by distinct lines of growth, and by many curved riblets, 
running down from the suture; the revolving lines become stronger, 
more elevated, and wider apart below the shoulder, and cross the 
ribs as well as their intervals; toward the base of the canal the ribs 
