571 



palatine here having a sliding articulation with each other, immediately 

 posterior to the process of the nasal, instead of being rigidly bound 

 together. 



9. In all of the mail-cheeked fishes examined there is an artery 

 which arises from the trunk formed by the union of the 1st, and 2nd. 

 efferent branchial arteries, and is the homologue of the hyo-opercularis 

 artery of my descriptions of Amia; that artery of Amia being a 

 remnant of the post-spiracular arterial arch of embryos of the fish. 

 This artery, in the mail-cheeked fishes, separates into anterior and 

 posterior portions, the former of which closely accompanies the 

 external and internal branches of the common carotid while the latter 

 is distributed to the region of the levator muscles of the branchial 

 arches. 



10. The external carotid, in all the mail-cheeked fishes examined, 

 traverses the trigemino-facialis chamber, gives ofi" several branches, 

 and then terminates in a branch which turns downward between two 

 flanges on the hind edge of the metapterygoid and falls into the 

 arteria hyoidea shortly before that artery enters the opercular hemi- 

 branch. This terminal portion of the external carotid corresponds 

 closely in position to, and is probably the homologue of the secondary 

 afierent pseudobranchial artery of my descriptions of Amia, and if this 

 latter artery should acquire connection with the arteria hyoidea, in- 

 stead of with the pseudobranch, is would give origin to the teleostean 

 arrangement. 



11. The alisphenoid is perforated, in Scorpaena, Trigla and 

 Lepidotrigla, by a foramen which transmits delicate branches of the 

 external carotid and hyo-opercularis arteries, these arteries being ac- 

 companied by a nerve which is composed not only of the lateralis 

 fibres destined to innervate the terminal organ of the supraorbital 

 canal, but also certain other, general cutaneous or communis fibres. 

 In Dactylopterus, the nerve that traverses the foramen does not 

 contain lateralis fibres; the nerve destined to supply the terminal 

 organ of the supraorbital canal there having an extracranial course. 

 The alisphenoid is also always perforated, or notched, in Scorpaena, 

 Trigla and Lepidotrigla, by another foramen, which transmits the 

 homologue of the anterior cerebral vein of my descriptions of Amia. 



These foramina, one or both, are found in the other mail-cheeked 

 fishes also, but the arteries and veins were not there traced. 



12. The quadrate has, in most if not in all teleosts, a posterior 

 process which forms the posterior boundary of the sympletic groove 

 pn the internal surface of the bone and has supporting relations with 

 the preopercular. This process of the quadrate is not found, as a 



