5 '4 
* 4 . E EerrlU — ' itnlogm of Marine Mol 
Figure 17. — The same. Side view of another specimen, of the many-ribbed variety, x 
6 diameters. 
Figure 1?. — The same. Side view of a larger specimen, of a more curved variety, 
with fewer and stronger ribs, x 2 diameters. 
Figure 19. — Stphonodenialmm vitreum , p. 557. side view of a large specimen with the 
apical denticles, or lobes, broken off. x 4| diameters. 
Figure 20. a, b. — Siphonentalis affinis, p. 558, aperture, a : and side view. b. x 5 
diameters. Halifax. X. S. ■ 
Figure 21. — Peeten r itreus. p. 581, lower side, natural size. Specimen from off N 
Scotia. 
Figure 22. — Pt ten Hoskywi. var. pushdosHs, 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 XU 1 1. 
Figure 1. — Cingula castanea. p. 525. x 16 diameters. 
Figure 2. — Cingula arealata, p. 524. x 14 diameters. 
Figure 3. — Cingula globulus, p. 524. x 16 diameters. From Gulf of St. Lawrence. 
Figure 4. — Buccinum ten ue. p. 495, small specimen, natural size: from off Cape Sable, 
X.S. 
Figure 5. — Buccinum cyaneum, p. 492. natural size: from off Cape Sable, X. S. 
Figure 6. — Sipho pubescent V., p. 501, small specimen, natural size; from off Cape 
Sable. X. S. 
Figure 7. — Anachis costulata, p. 513. x about 4 diameters. 
Figure 8. — Trophon dathratm. var. Gunners, p. 512. somewhat enlarged. The outer 
Kp is broken. 
Figure 9. — Pleurotamella Packardii V. ■ . 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 cancellated p. 475, slender variety, not fuM grown, x 4 diameters. 
Figure 1 1 . — 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 i- 
somewhat broken. 
Figure 14. — Bda harpularia, p. 473, typical form, from off Cape Cod, x 4 diameters. 
Figure 15. — Beta 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. 
