35 







PLATE XVIII. 



THE FKOGK 



EXTERNAL CHARACTERS 



FIG. 1. FROG with Limbs extended 



Anterior narea or external nares (L. nares, the nostrils). 

 Eye. 



Tympan ic membrane or membrana tym pani (L. tympanum, a drum). 

 Cutaneous pouch (L. cutis, the skin). 

 Clo acal aperture (L. cloaca, a sewer). 

 f Brachium (L. the arm). 

 \ Antebrachium (L. ante, before). 



FORE-LIMI! &amp;lt; Manu3 ( L- tho hand ). 



^ Four digits (L. digilus, tho linger or toe). 

 f Femur (L. the thigh). 



HIND-LIMB \ ^.^ , le f&amp;gt; 

 1 PCS (L. the foot). 



\ Five digits. 

 GENERAL DISPOSITION OF INTERNAL ORGANS 



FIG. 2. DISSECTION from the Ventral Surface to show VISCERA, Thoracic and Abdominal 



( Ventricle. 

 1 | Two auricles. 

 Lungs, right and left. 

 Stomach and intestine. 



Liver with gall-bladder, pancreas, and spleen. 

 Urinary bladder. 



Corpus adiposum (L. fatty body), finger-like yellow processes. 

 Testis, only one shown. 



DIAG. 1. TRANSVERSE SECTION THROUGH ABDOMEN- 

 NEURAL CANAL containing Spinal cord. 



I Lining membrane or pleuropcritoncal membrane (Or. 



pleuron, a rib ; peri, around ; teino, I stretch). 

 Alimentary canal suspended by two layers of the 

 membrane coming together in tho middle line the 



PLEUROPERITONE AL CAVITY = 



mes entery (Gr. mesos, middle ; enteron, intestine). 



THORACIC CAVITY lined by the pleura, I Testes suspended in the same way by the mesorchium 



and ABDOMINAL CAVITY lined by the \ (Gr. orchis, a testicle). 



peritoneum in Man. Kidneys held in place by the membrane covering their 



ventral faces. 



Sympathetic nervous system, two gangliated cords con 

 tained in triangular space formed by the layers of 

 membrane converging to form mesentery. 

 \ Dorsal aorta. 

 DIAG. 2. COMPARISON OP A TRANSVERSE SECTION OF A VERTEBRATE (FROG) AND AN INVERTEBBATE 



(LOBSTER) 



Invertebrate Vertebrate 



Visceral tube only. Visceral tube. 



Neural tube. 

 Notochord (Gr. notos, the back ; chorde, a string), the 



primitive axial column, separating the two tubes. 

 Limbs on neural or nerve side of body. Limbs on hamial or heart side of body. 



