SUMMARY OF CHAPTER 



29 



cut across one of the legs, at about the middle of the thigh, 

 will show in the middle of the cut surface the thigh-bone, 

 around it the flesh or muscle, and around this again the 

 skin. Similar cuts through various parts of both fore- and 

 hind-limbs show that these appendages of the body are solid. 



^a. 



SPH.E"^l 



P"- s.int 



Fig. 7. — Dissection of a Male Frog from the left side. The left fore- and hind-limb=; 

 and the left sides of the head and trunk have heen cut away, the enteric canal 

 and liver are displaced downwards, and the rr.outh, pharynx, and cloaca laid 

 open. 

 at!, anus ; b. d. bile-duct ; /'. hy. body of hyoid ; /'/. urinary bladder ; hi' . its opening 

 into the cloaca ; cart, conus arteriosus; cblni. cerebellum; cL cloaca; en. 3, 

 centrum of third vertebra ; cj>. ad. corpus adiposum ; c7-b. h. cerebral hemisphere ; 

 d. iy. s. dorsal lymph sinus ; (/;c. duodenum ; efi. cor. epi-coracoid ; ens. t. 

 Eustachian recess ; FR. PA. fronto-parietal ; gl. glottis ; gal. gullet ; IL. ilium ; 

 IS. ischium ; kd. kidney ; /. au. left auricle ; /. lug. left luiig ; Ir. liver ; M.MCK. 

 mento-meckelian hone ; n, a. /, arch of first vertebra ; olf. 1. olfactory lobe ; 

 opt. I. optic lobe ; O. ST. epi- and omo-sternum ; pcd. pericardium ; PMX. pre- 

 maxilla ; pii. pancreas ; /. na. internal nostril ; pit. pubis ; ret. rectum ; r. Ing. 

 right lung ; ^. int. ileum ; sp, cd. spinal cord ; SPH.ETfl. sphenethmoid ; 

 spL spleen ; st. stomach ; s. v. sinus venosus ; tng. tongue ; ts. spermary ; ur. 

 ureter; ur' . its aperture into the cloaca; 0ST. urostyle : v. ventricle; v.Iy.s. 

 ventral lymph sinus ; I'o. t. vomerine teeth ; vs. sent, seminal vesicle. (From 

 Parker and Haswell's Zoology.') 



containing no cavities, except the sub-cutaneous lymph- 

 sinuses previously observed. 



Summary. — We thus get a notion of the general plan of 

 construction of a frog as follows. It consists of a central or 



