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LIST OF PLATES. 



Plate 



I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII. 



XIX. 



XX. 



Pterygotus anglicus and Pterygotus minor. 

 Pterygotus anglicus. 



Recent Crustacea. 

 Pterygotus bilobus. 



,, and Parka. 



Slimonia acuminata. 



Plate 



XXI. 



XXII. 



XXIII. 



XXIV. 



XXV. 



XXVI. 



XXVII. 



XXVIII. 



XXIX. 



XXX. 



XXXI. 



XXXII. 



XXXIII. 



XXXIV. 



XXXV. 



XXXVL 



Stylonurus. 



Scolicus. 



Logani and Eurypterus mam- 



matus. 

 Eurypterus Seoul eri. 



„ fragments of, 



„ scorpioides. 



„ and Hemiaspis. 



Limuli from the Carboniferous and Silurian 



formations. 

 Development of Agnostus, Sao, and Tri- 



nucleus. Cyclus and Halicyne. 

 Larval stages of Limulus polyphem.us. 

 Anatomy of „ „ 



