LIST OF ENGRAVINGS. XXXI 



Fig. Page 



331 Pyloric appendices in the Salmon, (id.) 196 



332 Plan of double circulation 208 



333 Detached Dorsal vessel of Melolontha vulgaris, (Straus 



Durckheim) 219 



334 The same with its ligamentous and muscular attachments, 



(id.) 219 



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



(id.) 219 



336 Section of the dorsal vessel to show its valves, (id.) .... 219 



337 Circulation in the antenna of the Semblis viridis, (Carus) 222 



338 Course of circulation in the same insect, (id.) 222 



339 Dorsal vessel of the Caterpillar of the Sphinx ligustri, side 



view, (original) 224 



340 The same in the Chrysalis (original) 224 



341 The same in the Moth, (original) 224 



342 The same viewed from above, (original) 224 



343 Magnified lateral view of the anterior extremity of the 



dorsal vessel, (original) 224 



344 Magnified dorsal view of the same, (original) 224 



345 Structure of the valves of the dorsal vessel, (original) . . 224 



346 Heart and vessels of the Aranea domestica, (Treviranus) . 229 

 346*Circulation in the Planaria nigra, (Duges) 230 



347 Course of circulation in the Erpobdella vulgaris (Morren) 232 



348 Vessels in abdominal surface of the same, (id.) 232 



349 Vascular dilatations, or hearts of the Luvibricus ter- 



restris, (Morren) 235 



350 Cavities and great vessels of the Heart 238 



351 The Heart laid open to show its Valves 239 



353 Plan of circulation in Reptiles 247 



354 Branchial circulation in Maia Squinado, (Audouin) .... 237 



355 Organs of circulation in the Loligo sagittata, (id.) 243 



356 Plan of circulation in Fishes 245 



357 Plan of circulation in Batrachia 248 



359 Plan of double, or warm-blooded circulation 252 



360 Heart of the Dugong, (Home) 252 



365 Valves of the Veins, (Cloquet) 262 



366 Heart, branchial artery and gills of a fish, (Blasius) .... 273 

 3*37 Branchial apertures in the Squalus glaucus, (Bonnaterre) 273 



368 Branch'ml Rpertures in the Petromyzon marinus, {\d.) .. 273 



369 Internal structure of the branchia! of the same, (Home). . 273 



