584 A, E. Verrilli— Catalogue of Marine Mollusea. 
Figure 17.—The same. Side view of another specimen, of the many-ribbed variety, x 
6 diameters. 
Figure 18.—The same. Side view of a larger specimen, of a more curved variety, 
with fewer and stronger ribs, x 2 diameters. 
Figure 19.—Siphonodentalium vitreum, p. 557, side view of a large specimen with the 
apical denticles, or lobes, broken off, x 44 diameters. 
Figure 20, a, b.—Siphonentalis affinis, p. 558, aperture, a; and side view, b, x 5 
diameters. Halifax, N.S. 
Figure 21.—Pecten vitreus, p. 581, lower side, natural size. Specimen from off Nova 
Scotia. 
Figure 22.—Pecten Hoskynsi, var. pustulosus, p. 581, upper side of one of the type- 
specimens from Gulf of Maine, 150 fathoms. Enlarged a little more than two 
diameters. 
Figure 22a,—The same. Lower side. 
Figure 10, drawn from life, and figs. 16 and 17, camera-drawings, are by the writer; 
the rest are by J. H. Emerton. 
Several of the numbers on this plate, indicating the amount of enlargement, are 
erroneous. * 
PLATE XLIII. 
Figure 1.—Cingula castanea, p. 525, x 16 diameters. 
' Figure 2.— Cingula areolata, p. 524, x 14 diameters. 
Figure 3.—Cingula globulus, p. 524, x 16 diameters. From Gulf of St. Lawrence. 
Figure 4.—Buccinum tenue, p. 495, small specimen, natural size; from off Cape Sable, 
N.S. 
Figure 5.—Buccinum cyaneum, p. 492, natural size; from off Cape Sable, N. S. 
Figure 6.—Sipho pubescens’V., p. 501, small specimen, natural size; from off Cape 
Sable, N.S. 
Figure 7.—Anachis costulata, p. 513, x about 4 diameters. 
Figure 8.—Trophon clathratus, var. Gunneri, p. 512, somewhat enlarged. The outer 
lip is broken. 
Figure 9.—Pleurotomella Packardii V.é, p. 453, from the original type-specimen, x 2 
diameters. The shell is so turned that the lip partially conceals the aperture, in 
order to show the notch in the lip. 
Figure 10.—Bela cancellata, p. 475, slender variety, not full grown, x 4 diameters. 
Figure Li.—The same. ‘Typical form, x 4 diameters. 
Figure 12.—Bela incisula V., p. 461, x 4 diameters. 
Figure 13.—Bela decussata, p. 479, typical form, x 4 diameters. The outer lip is 
somewhat broken. 
Figure 14.—Bela harpularia, p. 473, typical form, from off Cape Cod, x 4 diameters. 
Figure 15.— Bela concinnula V., p. 468, typical form, x 4 diameters. The outer lip is 
somewhat broken off. 
Figure 16.—Bela Pingelii, p. 464, x 4 diameters. Eastport, Me. 
PLATE XLIV. 
Figure 1.— Yoldia lucida, x 6 diameters. From a variety more narrowed posteriorly 
than usual. 
Figure 2.— Yoldia frigida, p. 573, x 8 diameters, 
