22G Notes on the Osteology of the Shad. 



POKTIOX OF BRAIX CASE OF AlOSA SaPIDISSIMA. 



a. Frontal. 



b. Supraoccipital. 



c. Sphenotic. 



d. Prootic. 



d' Auditory Capsule. 



e. Basioccipital. 



f. Pterotic and Opisthotic 



g. Epiotic. 



h. Exoccipital. 



i. Cartilaginous nb-like rod, attached to membraneous wall of cavity in 

 basi-occipital 



1. Parietal foramen. 



2. Depression reaching down into exoccipital. 



3. Facet for anterior head of the hyomandibular. 



4. Facet for posterior head of hyomandibular. 



5. Foramen leading into anterior auditory chamber. 



6. Small foramen leading into same chamber (not described in text). 



7. Foramen in pterotic, leading into same chamber. 



8. Cavity in basioccipital. 



9. Exit for vagus. 



10. Exit for seventh nerves. 



The hyomandibular articulates with the skull by two heads, 

 widely separated, the posterior being much elongated and in 

 some specimens showing a division into two parts. A small 



