THE SKULL, AND THE CRANIAL AND FIRST SPINAL 

 MUSCLES AND NERVES IN SCOMBER SCOMBER.* 



EDWARD PHELPS ALLIS, Jr. 



Contents. 



Introduction 4o 



Osteology 4° 



1. Skull 48 



2. Vertebrae ^^3 



3. Visceral Arches 1^7 



1. Gill Filaments 1^7 



2. Basal Line 120 



3. Branchial Arches 123 



4. Hyoid Arch '^2)7 



5. Mandibular and Palatine Arches 151 



4. Shoulder Girdle, Sternum, and Pectoral Fin 158 



Lateral Line System 164 



1. Main Infraorbital Canal 165 



2. Supraorbital Canal '^72> 



3. Preoperculo-mandibular Canal 181 



4. Supratemporal Commissure 186 



5. Lines of Surface Pit Organs 187 



Myology ^88 



1. Muscles of the Eyeball 188 



2. Muscles innervated by the Nervus Trigeminus and Nervus 



Facialis ^89 



3. Muscles innervated by the Nervus Glossopharyngeus and Nervus 



Vagus : 204 



4. Muscles innervated by the Occipital and First Spinal Nerves.. 218 



5. Muscles of the Pectoral Fin 226 



Neurology 230 



1. Brain 230 



2. Nervus Olfactorius 232 



3. Nervus Opticus 234 



4. Nervus Oculomotorius 235 



* The manuscript for the present work was sent to the Journal of 

 Morphology, for publication, in July, 1899. Since then several important 

 works relating to the subject have appeared. To make proper reference to 

 them all would entail such important changes in the text, or such frequent 

 use of footnotes, that I conclude best to let the work appear as it was sent 

 to press, without additions or comment of any kind. 



45 



