XXXll LIST OF ENGRAVINGS. 



Fig. Pagp 



325 Base of the same tooth seen from below, (original) . . 214 



326 Alimentary canal of the Larva of the SjjJiinx Ligustri, 



(original) . 217 



327 of the Pupa of the same, (original) 217 



328 — of the Imago of the same, (original) 217 



329 — ^ of the Patella, (Cuvier) 220 



330 Stomachs of the Pleurobranchus Peronii, (id.), ..... 220 



331 Pyloric appendices in the Salmon, (id.) 222 



333 Detached Dorsal vessel o( Melolontha vulgaris, (Straus 



Durckheim) '. 237 



334 The same with • its ligamentous and muscular attach- 



ments, (id.) .' 237 



335 Side view of the anterior extremity of the same vessel, 



(id.) 237 



336 Section of the dorsal vessel to show its valves, (id.) . . 237 



337 Circulation in the antenna of the Semblis viridis, 



(Cams) 342 



338 Course of circulation in the same insect, (id.) 342 



339 Dorsal vessel of the Caterpillar of the Sjjfiinx ligustri, 



side view, (original) 245 



340 The same in the Chrysalis, (original) 245 



341 The same in the Moth, (original) 245 



342 The same viewed from above, (original) 245 



343 Magnified lateral view of the anterior extremity of the 



■ dorsal vessel, (original) 245 



344 Magnified dorsal view of the same, (original) 245 



345 Structure of the valves of the dorsal vessel, (original) 245 



346 Heart and vessels of the i4rawca t^omesfica (Treviranus) 249 

 346* Circulation in the Planaria nigra, (Duges) 250 



347 Course of circulation in the Erpobdella vulgaris (Morren) 253 



348 Vessels in abdominal surface of the same, (id.) ...... 253 



349 Vascular dilatations, or hearts of the Lumbricus ter- 



restris, (Morren) 255 



350 Cavities and great vessels of the Heart 259 



351 The Heart laid open to show its Valves 260 



352 Plan of simple circulation 262 



353 Plan of double circulation 'Hi^ 



354 Branchial circulation in Maia Squinado, (Audouin) . . 269 



