264 Journal of Comparative Neurology. 



vertebrae to the superior pharyngeal bone (Vetter, '78, 



P- 511)- 



Hi. — Ramus for m, pharyngeus transversus {m. ph. t.') — 

 This is a large stout muscle extending between the two 

 inferior pharyngeal bones. It is incompletely divided into 

 two parts, a large ventral part which is supplied by a 

 small number of very coarse and heavily myelinated fibres, 

 like those for the other branchial muscles which can be 

 traced back into the common motor component, and a 

 smaller dorsal part which is dorsally confluent with the 

 general constrictor muscles of the oesophagus and like 

 them is supplied by many very fine fibres whose origin 

 could not be traced. The muscular fibres of the ventral 

 part are very large and thick, those of the dorsal part 

 smaller, but not so small as those of the proper constrictor 

 of the oesophagus. 



iv. — Ramus for m. pharyyigo-clavicularis internus {m. 

 ph. c. i.) — This large muscle has its origin on the dorsal 

 edge of the cleithrum near its ventral end and passes 

 almost directly dorsad to its insertion along the lower 

 edge of the caudal part of the inferior pharyngeal bone. 



V. — Ramus for m. pharyngo-clavicularis externus {m. ph. 

 c. e.). — This is a short thick muscle which has a tendinous 

 origin from the inner face of the cleithrum farther caudad 

 and much farther dorsad than the last. Its fibres are 

 directed mesad, cephalad and slightly ventrad and cross 

 those of the m. pharyngo-clavicularis internus at about a 

 right angle, being closely appressed to the caudal face of 

 the latter muscle near its insertion. Their insertion is 

 tendinous upon the extreme ventro-caudal tip of the in- 

 ferior pharyngeal bone ventrally of the insertion of the m. 

 pharyngo-clavicularis internus and laterally of the caudal 

 part of that of the m. pharyngeus transversus. 



