REFERENCE 



TO 



THE PLATES OF VOL. L 



Plate I. Firola, Page 6 



II. Firoloida, 40 



III. Cccidomyia and Ceraphron, 64 



IV. Crustacea, 73 



V. Testudo geometrica, . 86 



VI. Crypta and Hemianthus, . 122 



VII. Aciinia, 187 



VIII. Zoanthus Mamillifera, &c 188 



IX. Collinsia, 192 



X. Squalus, 223 



XL Squalus, 225 



XII. Hydrostatic balance, 260 



XIII. Maclurite, 312 



XIV. Hyodon, 364 



XV. Hydrostatic balance, 370 



XVI. Cava and jugular veins, 404 



XVII. Pomoxis, Sarchirus, &c 422 



XVIII. Salamander and Scincus, 222 



Wood cut of the horn of the Ovis 



Montana, . 10 



