115 



this subject in connection with my recent work on Polyodon (Allis, 

 1911a), and I have accordingly had dissections made, by my assis- 

 tant, Mr. John Heney, of un injected alcohohc specimens of Esox, 

 Salmo and Gadus. Esox and Salmo were selected because they are 

 two of the fishes described by Maurer, while Gadus was chosen 

 because it is a fish so frequently used for laboratory demonstration 



s.spsb ec 



aall mhbr 



Fig. 1. Lateral view of the pseudobranchial, branchial and carotid arteries in 

 Esox lucius ; the dorsal aorta swung upward and appearing as in dorsal view. 



aa I. n. etc. afferent arteries in the 1st, 2nd, etc. branchial arches; a.cer. 

 anterior cerebral artery ; ahy afferent hyoidean artery ; amd afferent mandibular artery; 

 cc common carotid ; ch choroid ; da dorsal aorta ; ea I. II. etc. eiferent arteries in 

 the 1st, 2nd, etc. branchial arches; ec. external carotid; ehy efferent hyoidean 

 artery ; emd efferent mandibular artery ; hop hyo-opercularis artery ; ic internal 

 carotid ; Ida lateral dorsal aorta ; Ihbr lateral hypobranchial artery ; mhbr median 

 hypobranchial artery ; om ophthalmica magna artery ; ona orbito-nasal artery ; op 

 optic artery ; oph ophthalmic branch of external carotid and hyo-opercularis r p.cer 

 posterior cerebral external ; psh pseudobranch ; s.ahy secondary afferent hyoidean 

 artery ; s.apsb secondary afferent pseudobranchial artery ; ta truncus arteriosus. 



and text book illustration. Only the main arteries and their larger 

 branches were carefully traced in these dissections, all smaller bran- 

 ches being more or less neglected. 



8* 



