List of Abbreviations. 



labials. 



lateral expansion of rostral. 



laterarstay. 



lower jaws. Meckelian. 



mesopterygium (nsp. pi. 67). 



nietapterygiuni. 



maxillaries, quadratopterygoids. 



prenarial cartilages. 



nasal valves. 



opercular cartilages. 



epibranchials. 



posterior branchial support. 



pectoral arch, shoulder girdle. 



post orbital process. 



projiterygium. 



postspiracular cartilage. 



quadratopterygoid. 



ro.stral cartilage. 



suprabranchial.s. 



scapular. 



supraorbital. 



.spiracular. 



basal element of eighth arch. 



