35 



j 



PLATE XVIIL 



THE FROG. 



EXTERNAL CHARACTERS 



FIG. 1. FEOG 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). 



r Brachium (L. the arm). 



\ Antebrachium (L. ante, before). 

 FORE-LIMB < Manug ( L the h and). 



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

 f Femur (L. the thigh). 

 ) Crus (L. the leg). 



HlND-LlMB 



} Pes (L. the foot). 

 U 



. Five digits. 

 GENERAL DISPOSITION OF INTERNAL ORGANS 



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



( Ventricle. 

 ' ( 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 



NEURAT, CANAL containing Spinal cord. 



I Lining membrane or pleuropcritoneal 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 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 ; chortle, a string), the 



primitive axial column, separating the two tubes. 

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



