26 THE SESAMOID ARTICULAR 



THE SALMOPEROffi. 

 Percopsis guttatus. 



The sesamoid articular is very loosely attached to the upper surface 

 of Meckel's cartilage, slightly in contact with the endosteal process of 

 the articular, but scarcely with the ectosteal part. 



Aphredoderus sayanus. 



The sesamoid articular is situated against the ectosteal plate of the 

 articular, above and outward from the endosteal process, and nearly 

 covered from sight by Meckel's cartilage. 



THE PERCESOCES. 

 Atherinopsis californiensis 



In this the sesamoid articular is very long. In a mandible 22 mm. 

 in length it is one-third of this length. It is closely attached to the ecto- 

 steal plate of the articular, and still more closely to the top of the endo- 

 steal process. It overlies the top of Meckel's cartilage, and projects to 

 a considerable extent between it and the articular. The adductor tendon 

 attached to it is large. 



Menidia notata. 



The sesamoid articular is short and deep, attached to the upper and 

 inner surface of Meckel's cartilage and the endosteal process of the articu- 

 lar, and to the ectosteal plate above them. 



Sphyraena argentea. 



The sesamoid articular is a small sliver of bone attached to the ecto- 

 steal plate of the articular in front of the endosteal process. It is nearly 

 covered by Meckel's cartilage. 



Mugil cephalus. 



The sesamoid articular is here a rather large, thick disk of bone 

 attached to the ectosteal plate and to the top of the endosteal process of 

 the articular. It extends considerably above Meckel's cartilage, and is 

 covered but slightly by it. 



