Explanation of Plates. 293 



Figure 10. — Diphdonta turgida V. and S., p. 279. Viow of the exterior of the right 



valve ; uatural size. 

 Figure 11. — The same. View of the interior of a somewhat smaller valve; uatural 



size. 

 Figure 12. — Modiolaria politaY. and S., 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 (Miill.), 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; x ^ diameters. 



Figure 16. — Idas argenteiis Jeff., var. laviellosa 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 S., p. 147. Front view of one of the stouter 

 specimens, ascertained to be a female by examination of the animal; natural size. 

 Figure 2. — Pleurolometla Benedicti V. and S., p. 148 ; x 2 diameters. 

 Figure 2a. — The same. Apical whorls ; x 22 diameters. 

 Figure 3. — Pleurotomella Sandersoni V., p. 149; x4 diameters. 

 Figure 3a. — The same. Nuclear vs^horl ; x 22 diameters. 

 Figure i.— Pleurotomella Saffordi V. and S., p. 151 ; x 3 diameters. 

 Figure 4a. — The same. Nuclear whorls; x 22 diameters. 

 Figures. — Pleurotomella handella {p&\\)r=zP. DiomedeceY. and S., pp. 152 and 250; 



x 3 diameters. 

 Figure 5a. — The same. Nuclear whorls ; x 22 diameters. 

 Figure 6. — Pleurotomella Emertoni V. and S., p. 154; x 2 diameters. 

 Figure 7. — Pleurotomella Bruneri V. and S., p. 155 : x 2 diameters. 

 Figure 7a. — The same. Profile view of a younger specimen; x 4 diameters. 

 Figure 8. — Tijphlomungilia TanneriY. and S., p. 163; x 2 diameters. 

 Figure 9. — Pleurotomella Catharmce V. and S., p. 155 ; x4 diameters. 

 Figure 9a. — The same. Nuclear wfhorls ; x 22 diameters. 

 Figure 10. — Gymnohela curta V., p. 158 ; x 2 diameters. 

 Figure 11. — Buccinum ahyssorum V. and S., p. 167; natural size. 

 Figure 11a. — The same. Operculum of another specimen ; natural size. 

 Figure 1 1 &.^The same. Dentition. 



Figure 12. — Benthodolium abyssorum Y. and S., p. 177; natural size. 

 Figure r2a. — The same specimen. * Operculum ; natural size. 

 Figure 12&. — 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 S., p. 170 ; natural size. 

 Figure 14. — Seguenzia formosa Jeffreys, p. 186 ; x 8 diameters. 

 Figure 14a. — The same. Operculum; more enlarged. 

 Figure 14&. — The same. Dentition ; x 250 diameters. 

 Figure 15. — Seguenzia eritima V., p. 189; x 8 diameters. 

 Figure 16. — Sipho leptaleus V., p. 175 ; x 6 diameters. 



