List of Abbreviations. 



labials. 



lateral expansion of rostral. 



lateral stay. 



lower jaws. Meckelian. 



mesopterygium (nsp. pi. 67). 



metapterygium . 



maxillaries, quadratopterygoids. 



prenarial cartilages. 



nasal valves. 



opercular cartilages. 



epibranchials. 



posterior branchial support. 



pectoral arch, shoulder girdle. 



post orbital process. 



propterygium. 



postspiracular cartilage. 



quadratoptery goid . 



rostral cartilage. 



suprabranchials . 



scapular. 



supraorbital. 



spiracular. 



basal element of eighth arch. 



