222 



BRANCH CHORDATA 



Fig. 184. Anatomy of common frog: My, mylohyoid; sr, stornoradials; 

 th, thyroid; lu, lungs; /, fat-body; Te, testis; St, stomach; Sp, spleen; R, 

 rectum; a, adductor longus; mvi, vastus internus; ms, sartorius; ri', rectus 

 internus major; la, tibialis anticus; g, gastrocnemius; ri", rectus internus 

 minor; a", adductor magnus; rab, rectus abdominalis; B, bladder; vd, vas 

 deferens; b, gall-bladder; Ki, kidney; pv, portal vein; Li, liver; V, vena 

 cava inferior; Ao, aorta; S, vocal sac or rroaking-bag. II. Origin of the 

 arterial trunks: I, Arteria ingualis; eg, carotid gland, which is merely a 

 rete mirabile; cr, carotid artery; Ao, aortic arch; Pa, pulmonary artery. 

 III. Dorsal view of muscles of hind leg: gl, Gluteus; ra. rectus anterior; 

 p, pyriformis; ve, vastus externus; sm, semimembranosus ; b, b, biceps; g, 

 gastrocnemius; per, peroneus. (From drawing by C. S. Minot.) (From 

 Packard's " Zoology," Henry Holt & Co., Publishers.) 



