Explanation of Plates. 293 
Figure 10.—Diplodonta turgida V. and §., p. 279. View of the exterior of the right 
valve; natural size. 
Figure 11.—The same. View of the interior of a somewhat smaller valve; natural 
size. 
Figure 12.—Modiolaria polita V. and. p. 281. Type specimen. Side view of a 
small specimen; natural size. 
Figure 13.—Tellimya ferruginosa (Mont.). Side view of a living specimen with the 
animal fully extended; enlarged about 8 diameters. 
Figure 14.—Leda pernula (Mill.), p. 280. Side view of a specimen having the beak 
curved more than usual; x 2 diameters. 
Figure 14a.—The same specimen. View of the hinge; x 4 diameters. 
Figure 15.—Leda acuta V., p. 259. Side view; x3 diameters. 
Figure 16.—Jdas argenteus Jeff., var. lamellosa V., p. 281. Side view; x 6 diameters. 
Figure 16a.—The same. View of the interior of the right valve: x 6 diameters. 
PLATE XXXI. 
Figure 1.—Pleurotomella Bairdii V. and §., p. 147. Front view of one of the stouter 
specimens, ascertained to be a female by examination of the animal; natural size. 
Figure 2.—Pleurotomella Benedicti V. and 8., p. 148; x 2 diameters. 
Figure 2a4.—The same. Apical whorls; x 22 diameters. 
Figure 3.—Pleurotomella Sandersoni V., p. 149; x4 diameters. 
Figure 3a.—The same. Nuclear whorl; x 22 diameters. 
Figure 4.—Pleurotomella Saffordi V.and 8., p. 151; x3 diameters. 
Figure 4a.—The same. Nuclear whorls; x 22 diameters. 
Figure 5.—Pleurotomella bandella (Dall)=P. Diomedee V. and §., pp. 152 and 250; 
x 3 diameters. 
Figure 5a.—The same. Nuclear whorls; x 22 diameters. 
Figure 6.—Pleurotomella Emertoni V. and 8., p. 154; x2 diameters. 
Figure 7.—Plewrotomella Bruneri V. and §., p. 155; x 2 diameters. 
Figure Ta.—The same. Profile view of a younger specimen; x 4 diameters. 
Figure 8.—Typhlomangilia Tanneri V. and S., p. 163; x 2 diameters. 
Figure 9.—Pleurotomella Catharine V. and §., p. 155; x4 diameters. 
Figure 9a.—The same. Nuclear whorls; x 22 diameters. 
Figure 10.—Gymnobela curta V., p. 158; x 2 diameters. 
Figure 11.—Buccinum abyssorum V. and 8., p. 167; natural size. 
Figure 1la.—The same. Operculum of another specimen; natural size. 
Figure 11b.—The same. Dentition. 
Figure 12.—Benthodolium abyssorum V. and 8., p. 177; natural size. 
Figure 12a.—The same specimen. Operculum ,; natural size. 
Figure 12b.—The same specimen. Dentition; x 75 diameters. 
Figure 12c_—The same. Marginal portion of one of the jaws; x 22 diameters. 
Figure 13.—Sipho profundicola V. and 8., p. 170; natural size. 
Figure 14.—Seguenzia formosa Jeffreys, p. 186; x 8 diameters, 
Figure 14a.—The same. Operculum; more enlarged. 
Figure 14b.—The same. Dentition ; x 250 diameters. 
Figure 15.—Seguenzia eritima V., p. 189; x8 diameters. 
Figure 16.—Sipho leptaleus V., p. 175; x6 diameters. 
