430 



HISTORY OF THE HUMAN BODY 



animals in its own class, in which the cord is nearly coterminous 

 with the tail (Fig. 120). Indeed, an almost absurd result of 

 this is shown in a certain teleost, Orthagoriscus (Fig. 121, &), 



a 



Brach 



H 



Il.liy 



Cm. 

 Sciat 



FIG. 120. Spinal nerves of two amphibians, showing differences in the 

 degree of concentration. 



(a) Frog. [After GAUPP.] (b) Necturus. [Combined from drawings by WAITE.] 

 Hpgl, hypoglossal nerve; Brack, brachial; Thor. abd, thoraco-abdominal; Sp. cor, 



supracoracoid; //. hy, ilio-hypogastric; Cm. crural; Sciat, sciatic. The vertebrae 



are numbered by arabic numerals, the spinal nerves by roman. 



