THE SESAMOID ARTICULAR 33 



Ovoides setosus. 



This differs from Spheroides only in having the sesamoid articular 

 attached more directly to the mandible without the intervention of much 

 tendinous tissue, and in the bone being enlarged and spreading out at the 

 end of the tendon. 



Chilomycterus schoepfi. 



The enclosteal process is obscure. The sesamoid articular is rather 

 large, and is attached closely against the articular just above Meckel's 

 cartilage, which covers its lower edge. 



Lactophrys tricornis. 



The sesamoid articular is situated on the surface of the endosteal 

 process, and on Meckel's cartilage to a very small extent. 



THE MAIL-CHEEKED FISHES. 



Scorpaena senorae, Scorpaena scrofa, Scorpaena ustulata, Scorpaena 

 plumieri, Sebastes marinus, Sebastolobus alaskanus, Sebastodes 

 flavidus, Prionotus evolans, Prionotus horrens, Trigla corax. 



The sesamoid articular is situated against the ectosteal plate just 

 in front of the endosteal process, and more or less completely hidden by 

 Meckel's cartilage. In Scorpaena scrofa it is rather large and runs for- 

 ward in a splint of bone. In Trigla it is moderate in size, and in the 

 others it is small. 



Zaniolepis latipinnis, Ophiodon elongatus, Liparis agassizii. 



These differ from Scorpaena et. al. in having the sesamoid articular 

 covered by the endosteal process as well as by Meckel's cartilage. In 

 Liparis it is only slightly behind the process. 



Hexagrammos decagrammus, Scorpaenichthys marmoratus, Myoxo- 

 cephalus octodecemspinosus, Podothecus acipenserinus. 



The sesamoid articular is more on top of the endosteal process and 

 Meckel's cartilage than covered by them. It is closely connected with 

 the ectosteal plate. 



