208 



ZOOLOGY, 



Fig. 159. Asterias, or Sea Star. 

 */ 



* This theoretical figure is intended to indicate the relative position of the 

 great organic apparatuses in the class mammals : b, buccal cavity forming 

 the entrance of the alimentary tube, the exit is at the posterior extremity 

 of the body ; i, the intestine ; ./, the liver ; t, trachea p, lungs ; c, the 

 heart j e, encephalon (brain, &c.) ; m, spinal marrow. 



