The two inner or adjacent eyes 



I Choroidal fissures 



.. Obliq. inf. of an inner eye 

 _. Nerve II of an inner eye 

 \ ..- Olfactory cartilage and beginning of trabeculae 



Rectus int. inner eye 

 Rectus sup. inner eye 

 ' Obliq. inf. outer eye 

 Rectus int. outer eye 

 - Optic nerve and commissure 

 The two sets of hypoaria and hypophyses 



" Rectus ext. of right outer eye 



."' Hyomandibular 



Periotic cartilage 

 "" The paired notochords and parachordals 



-The two aortae 



Inner muscular segments 

 Head-kidney with glomerulus 



The two notochords 



Lateral muscle segments 



" The composite spinal cord 



Kir,. 41 Hon in timiugh same ii- 



,.'Uion is at a still < . uul passes l>elo\\ tin- 11 



!he Itnsnl parts of the brain and ! 



nerves and fissurr >sl to the cur ><ly is 



cut through somewhat obliquely, IB -ml- and head-kidneys, 



as well as th. composite spinal coi iin-dian mii'scular mass. TV-re is 



greater apparent duplicity in the (a. body than in the posterior cerebral 



region. For other references see under I'l. I. Fig. i. ( x 12. ) 



The two inner or adjacent eyes 



Choroidal fissures 



Obliq. inf. of an inner eye 



Nerve II of an inner eye 



Olfactory cartilage and beginning of trabeculae 



Rectus int. inner eye 



'^ Rectus sup. inner eye 



: - Obliq. inf. outer eye 

 Rectus int. outer eye 

 Optic nerve and commissure 



- Choroidal fissure 



- The two sets of hypoaria and hypophyses 



- Rectus ext. of right outer eye 

 Periotic cartilage 



. .- Hyomandibular 

 ..Upper ends of gill arches 



The paired notochords and parachordals 



The two aortae 



Fir,, 42. The anterior pi 



(X2I.) 



An aortic root (third) 



of last specimen shown in higher magnification. 



J. F. G. 



PL. XI. 



XI 



