xiv Li.<t (if Plates. 



Fig. 1. Spirifer lawls, Hal], ventral valve, showing surface 



marking. 

 2. The same, shov\'ing hinge-area, beak, and deltidium, 



and (b) dorsal valve. 

 'S. S. fimhriaiiifs. Conrad ; ventral valve. 



4. The same, showing beak and area, and (b~ dorsal valve. 



5. H IcKv'iH, H., side view. 



(J. 8. fi'inbriatus, C, cardinal view. 



7. The same, side view. 



8, 9, 10. S. crispaft, Hisinger; ventral, dorsal, and side 



views (after Hall). 



11, a, b. The same, narrow variety. 



12, a, b. <V. bicostatus, Vauuxem (after Hall). 

 18, a, b. S. crispus, His., wide variety. 



Pr.ATK XV. 



Geological map of Richmond Co., New York, (Staten Island). Art. XI, 

 pp. 1(51—182. 



Plate XVI. 

 Geological sections across Staten Island, N. Y. Same article. 



Pl..\TE XVII. 



Geology of the North-eastern West India islands. Art. XII, pp. 185 — 198. 

 Fig. 1. Section through the Virgin Islands. 



2. Sections through the LccAvard Islands. 



Plate XVIII. 

 Geological map of a part of Western New York. Art. XV, pp. 249 — 267. 



Plate XIX. 



Magnified sections of meteorites. Art. XVIII, pp. 389 — 312. 



Fig. 1. Weston, Conn. ; fell 1807. 300 diameters. 



2. Left upper part of Fig. 1. 1500 



3, 4, 5. Same meteorite. 300 



6. North Carolina; fell 1849. 75 



7, 8. Same meteorite. 300 

 9. Charles Co. , Md. ; fell 1825. 800 



