AORTIC LIGAMENT IN INDIAN FISHES. 63 



Text-figure 1. 



Peudeutropins gariia (nat. size). The dorsal aorta has been opened from the 

 ventral side to show the disposition of the ligament, 



Vom., vomer ; lig.a.', the branches of the anterior portion of the ligament which 

 become attached to the vomer; par., parasphenoid ; lig.a.", the two main 

 branches of the anterior portion of the ligament ; has., basioccipital ; lig.a., 

 the anterior portion of the ligament ly'mg outside the dorsal aorta ; lig.per., 

 the place where the ligament perforates through the dorsal wall of the aorta ; 

 e^.a., efferent branchial vessels ; a/.s., anterior fan-shaped structure; r.m.c, 

 round masses of coimective tissue or sub-vertebral masses ; i.v.c, sub-inter- 

 vertebral masses of connective tissue ; aortic ligament ; aor., aorta; ver., 

 vertebrae ; p.f.s., posterior fan-shaped structure ;• liy., hypural bone. 



