THE SESAMOID ARTICULAR 3! 



they appear at the upper end as a single flat band, but they are easily 

 separated. The sesamoid articular is as in Tautoga, though more broadly 

 attached to the endosteal process. 



Sparisoma flavescens. 



The sesamoid articular is rather flat and disk-like. It is firmly at- 

 tached against the ectosteal plate and the upper side of the endosteal 

 process and Meckel's cartilage. 



THE SQUAMIPINNES. 



Chaetodipterus faber, Chaetodon bimaculatus, Holocanthus tricolor, 



Platax teira. 



The sesamoid articular is closely attached against the ectosteal plate 

 and about half hidden by the overlying endosteal process. In Chaetodip- 

 terus it is only slightly in contact with Meckel's cartilage ; in the others 

 it is broadly in contact. In Chaetodon it is more above the process and 

 cartilage. 



Drepane punctata. 



In this the endosteal process is obscure. The sesamoid articular is 

 small and disk-like, and is closely attached against the ectosteal plate, 

 where it is hidden behind Meckel's cartilage. 



Zanclus canescens. 



The sesamoid articular is attached against the ectosteal plate only 

 very slightly in contact with Meckel's cartilage and remote from the 

 endosteal process. 



Teuthis bahamus. 



The articular is very short and its endosteal process reaches to its 

 anterior end, leaving but little space for Meckel's cartilage. Almost 

 directly at the anterior end of the articular, on the upper surface of the 

 endosteal process and the base of Meckel's cartilage, is a rather large 

 sesamoid articular. 



Xesurus punctatus. 



In this the endosteal process does not occupy so great a part of the 

 articular as in Teuthis, and the sesamoid articular is confined to the upper 

 surface of Meckel's cartilage and the endosteal part of the articular. 



