XIII 



PHYLUM CHORDATA 



275 



end attached to the foot the insertion. According to their action 

 muscles are divided into Jlc-cors which bend, and exlcnaora whicli 



hmt 



Fig. ti2S.— Rana esculenta. The nuiscles from the ventral aspect. On the left side (right of 

 figure) many of the suiierficial miiseles have been cut and reflected to .show the deep layer. 

 add. brev. adductor brevis ; ndd. lomj. adductor longus ; ndd. iiiar/. adductor magnus ; del. del- 

 toid ; e.rt. cr. extensor cruris ; ext. trs. extensor tarsi ; FE. femur ; gn. hy. genio-hyoid ; 

 gslr. gastrocnemius ; hy.gl. hyoglossus ; ins. ten. inscriptio tendinea ; I. alb. linea allja ; 

 rny.ln/. mylo-hj'oid ; obi. int. obliquusinternus ; obi. ej:t. obliquus externus ; est. omostcrnuni ; 

 /'. c. hii. posterior coriiu of hyoid ; pet. pectoralis ; prtn. pectineus ; per. iDcronitus ; ret. cil/d. 

 rectus abdominis ; reel. iat. maj. rectus intennis niajoi' ; reel. int. rtiin. rectus internus minor ; 

 sar. sartorius ; sb. mt. sub-nieiitalis ; .^cin. ten. semi-tendinosus; tib. ant. tibialis anticus; ti/j. 

 post, tibialis posticus ; TI. FI. tibiofibula ; vast. int. vastus intonius ; .<;. st. xiphisternum. 



