4 
ordinary ink, or carmine fluid, and to repeat the injections as the 
dissections progressed. 
There are, as shown in ALLEN’s figure, four afferent branchial 
and an afferent hyoidean artery on either side, all arising separately 
and independently from the truncus arteriosus, and there is no 
indication of either dorsal or ventral commissural branches, such as 
are found in Chlamydoselachus (Arrıs, 1911), connecting any of these 
arteries. The afferent hyoidean arteries arise from the extreme anterior 
end of the truncus arteriosus, and there is no indication whatever 
of an afferent mandibular prolongation of the truncus. The afferent 
hyoidean artery, on either side, runs upward along, or near, the 
a.cer ic, Ida 
WeCGa cc ' 

Fig. 1. The branchial, pseudobranchial and carotid arteries in Chimaera 
colliei; the dorsal aorta swung upward and the truncus arteriosus downward so as 
to bring the vessels all into the same place. 
Index letters (Fig. 1 and 2). 
aa I. II. ete. afferent arteries in the 1st, 2nd, etc. branchial arches; a. cer 
anterior cerebral artery; ahy afferent hyoidean artery ; amd afferent mandibular 
artery; apsb afferent pseudobranchial artery; cc common carotid; cor coronary artery; 
da dorsal aorta; ea J, II. etc. efferent arteries in the Ist, 2nd, "etc. branchial arches; 
ec external carotid; ehy efferent hyoidean artery; elh external lateral hypobranchial 
artery; epsb efferent pseudobranchial artery; hyp hypobranchial artery; ic internal 
carotid; /da lateral dorsal aorta; om ophthalmica magna artery; s. ahy secondary 
afferent hyoidean artery; scl subclavian artery; ta truncus arteriosus. 
postero-ventral (external) edge of the ceratohyal, and when it reaches 
the cartilaginous rays that are attached to the hind edge of the dorsal 
portion of that element it passes external (anterior) to them and then 
