" 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. 



^dtc spl 

 /"* s.int 



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

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

 and liver are displaced downwards, and the mouth, pharynx, and cloaca laid 

 open. 

 an. anus ; h. d. bile-duct ; h. hy. body of hyoid ; bl. urinary bladder ; bT . its opening 

 into the cloaca ; cart, conus arteriosus; cblin. cerebellum; cl. cloaca; en. j. 

 centrum of third vertebra ; cp. ad. corpus adiposum ; crb. h. cerebral hemisphere 

 d. ly. s. dorsal lymph sinus ; du. duodenum ; ep. cor. epi-coracoid ; ens. t 

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

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

 mento-meckelian bone ; 71. a. /, arch of first vertebra ; olf. l. olfactory lobe 

 opt. l. optic lobe ; 0. ST. epi- and omo-sternum ; J<cd. pericardium ; PMX. pre^ 

 ma.villa ; pn. pancreas ; p. 71a. internal nostril ; pi(. pubis ; yet. rectum ; r. Ing. 

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

 spl. spleen ; st. stomach ; i-. v, sinus venosus ; tng. tongue ; ts. spermary ; ?<■? 

 ureter ; iir' . its aperture into the cloaca ; UST. urostyle : i-. ventricle ; v. ly. j 

 ventral lymph sinus ; I'o. t. vomerine teeth ; vs. seni. seminal \-esicle. (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 



