XXVlll 



LIST OP ENGRAVINGS. 



Fig. 



343 Magnified lateral view of the anterior extremity of the dorsal 



vessel, (original) . • . . . 



344 Magnified dorsal view of the same, (original) 



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



346 Heart and vessels of the Amnea dotnestica, (Treviranus) 

 346* Circulation in the Planaria nigra, (Duges) 



347 Course of circulation in the Erpobdella vulgaris, (Morren) . 



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



349 Vascular dilatations, or hearts of the Lumhricus terrestris, 



(Morren) . . . . • 



350 Cavities and great vessels of the Heart, . 



351 The Heart laid open to show its Valves, 



352 Plan of simple circulation, 

 ' 353 Plan of double circulation, 



354 Branchial circulation in Maia Squinado, (Audouin) 



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



356 Plan of circulation in Fishes, 



357 Plan of circulation in Batrachia, 



359 Plan of double or warm-blooded circulation, 



360 Heart of the Diigong, (Home) 



365 Valves of the Veins, (Cloquet) . 



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



367 Branchial apertures in the Squalus glaucus, (Bonnaterre) 



368 Branchial apertures in the Petromyzon marinus, (id.) 



369 Internal structure of the branchias of the same, (Home) 



370 Stigmata in the abdominal surface of the Dytiscus margina- 



lis, (Leon Dufour) . . . . • 



371 Stigmata of the Ceramhyx heros, (Fab.) magnified, (id.) 



372 Longitudinal trachese of Carabus auratus, (id.) . 



373 Air vesicles and trachea? of the Scolia hortorum, (Fab.) high- 



ly magnified, (id.) ....•• 



374 Respiratory apparatus of the Scorpio eiiropcBus, (Treviranus) 



375 Internal structure of the lungs of the Turtle, (Bojanus) . 



377 Air cells of the 0-s/ric/i, (Parisian Academicians) 



378 Lymphatic Absorbents, . ■• ... 



379 Passage of Nerves through a ganglion, 



380 Plexus of Nerves, ..... 



381 Varieties of forms of antennae of Insects, (Goldfuss) . 



382 Vertical and longitudinal section of the right nostril in man, 



383 Vertical transverse section of the same, . 



384 Transverse section of the nostril of a Sheep, (Harwood) 



385 Turbinated bones of the »SeflZ, (id.) 



Page 



177 

 177 

 177 

 180 

 181 

 183 

 183 



184 



187 



188 



189 



191 



193 



195 



196 



197 



199 



200 



206 



216 



216 



216 



216 



222 

 222 

 222 



222 

 225 

 229 

 233 

 250 

 255 

 255 

 272 

 283 

 284 

 285 

 285 



