THE FROG. 



PLATE I. 



THE FKOG. EXTERNAL CHARACTERS. THE GREAT CAVITIES OF THE BODY, AND THE 

 GENERAL DISPOSITION OF THE ORGANS CONTAINED THEREIN. THE MODE OF SUSPENSION 

 OF THE VISCERA. 



Unless otherwise stated, all the figures of Plates I. to VII. refer to the Common Frog, 

 Rana temporaries. 



FIG. I. Head of Rana esculenta, 3, from above. 

 The vocal sac was inflated from the mouth. 



FIG. II. Head of Rana temporaria, 3, from the same aspect. 

 FIG. III. The same, side view. 



FIG. IV. The left manus of Rana temporaria. 

 <?, Palmar surface. 



FIG. V. The same of the ? . 



FIG. VI. The left pes of Rana temporaria. Plantar surface. 



FIG. VII. The same of Rana esculenta. 



(Figs. I. to VII. all natural size.) 



FIG. VIII. Dissection to show the general disposition of the viscera. 



The skin, ventral muscles, and sternum were all removed, and the pericardium 

 opened up. 



All the organs were left undisturbed, with the exception of the right lung ; in removing 

 the ventral muscles the anterior abdominal vein was dissected out, and the great veins of 

 the head and arm were removed on the right side,* to display the arterial arches and 

 adjacent glands. Nat. size. 



FIG. IX. General dissection, to show the boundaries of the body cavity, and the 

 mutual relations of those organs lodged within it, as seen from the left side (compare 

 Fig. VIII.) 



The animal was pinned down through its hind linibs, those of the left side being 

 removed, the pleuro-peritoneal, buccal, nasal, and neural cavities were each opened up, 

 cutting well to one side of the middle line. 



The dotted lines indicate the course of the oesophagus, i . x 2. 



Bee Appendix A. 



