262 



LIST OF WOODCUTS. 



Fig. page 



68. Head-shield of Hemiaspis speratus 1/8 



69. ,, „ horridus 179 



70. „ „ Salweyi 179 



71. Lip-plate of Pterygotus 180 



72. Hemiaspis limuloides 200 



73. Telson of Stylonurus 200 



Fig. page 

 74 — 77. Earliest stages in embryology of 



Limulus polyphemus 214 



78. Neolimulus falcatus 234 



79. Bellinurus Kiltorkensis 238 



80. Cychts torosus, two views of shield 250 



81. „ Harknessi, profile of 252 



