ILLUSTRATIONS 



PLATES 



FACING PAGE 



I. Dissection of Yiesid oi Polyodon spat/mla 126 



II. Principal Trunks of Polyodo7i spathula 12S 



III. Portions of Lymphatic Trunks of Polyodon 130 



IV. Deeper Dissection of Portions of Lymphatic Trunks of 



Polyodon 132 



V. Dissections of Portions of Lepisosteus tristoechus and 



Lepisosteus osseus 1 34 



VI. The same continued 136 



VII. Dissection of Portion of Lepisosteus tristoechus 138 



VIII. Dissection of Portion of Lepisosteus osseus 140 



IX. Transverse Sections of Portions of Lepisostejis osseus and 



Branchial Arch of 7^(c/yc>(/c« 142 



X. Dissections of Portions of /'io/yi?fl?o?z 144 



XI. The same continued 146 



XII. The same continued 148 



XIII. Transverse Sections of Portions of Polyodon 150 



XIV. The same continued , 152 



XV. The same continued 1 54 



