35 

 PLATE XVIII. 



THE FKOGK 



EXTERNAL CHARACTERS 



FIG. 1. FROG with Limbs extended 



Anterior nares 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-LIMB < Manug ( L the hand). 



(_ Four digits (L. digitus, the finger or toe). 

 f Femur (L. the thigh). 



HIND-LIMB \ C (L the leg). 

 I Pes (L. the foot). 

 V Five digits. 

 GENERAL DISPOSITION OP INTERNAL ORGANS 



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

 w ( Ventricle. 



' I 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. 



Lining membrane or pleuroperitoneal membrane (Gr. 



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

 Alimentary canal suspended by two layers of the 

 membrane coming together in the middle line the 



PLEUROPERITONE'AL CAVITY = 



THORACIC CAVITY lined by the pleura, . 

 and ABDOMINAL CAVITY lined by the \ 

 peritoneum in Man. 



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

 Testes suspended in the same way by the mesorchium 



(Gr. orchis, a testicle). 

 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 OF A TRANSVERSE SECTION OF A VERTEBRATE (FROG) AND AN INVERTEBRATE 



(LOBSTER) 



Invertebrate Vertebrate 



Visceral tube only. Visceral tuba 



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 hasmal or heart side of body. 



