(126) 



eFf.pm 



l.br.l 



Fig. 84. Head shield of the ccphalaspid Kiaeraspis, see from below. 5 X natural size. 



car. a. internal carotid; d.ao. dorsal aorta; eff.br. 4. 4th efferent branchial; eff.pm. efferent branchial 



of 1st arch; i.br.i. 1st interbranchial ridge; oes. oesophagus; orb. depression made by orbit; vest. 



depression made by vestibular apparatus. V1-X2. Cranial nerves. 



(After Stensio.) 



hup. foss 



orb 



■ C3p tat 



Mf/m 



Fig. 85. Cast of the endocranium and system of canals in the head shield of Kiaeraspis. 

 amp. ampulla of posterior semicirculr canal; can. canal leading to field; car. a. carotid artery; 

 hyp.foss. hypophysial fossa; /./. lateral 'electric' fields; med. medulla oblongata; nas.c. naso- 

 hypophysial canal; orb. orbit; v.cap.lat. vena capitis lateralis; vest, vestibular apparatus; III-X 



cranial nerves. (After Stensio.) 



