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CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



SIGNIFICANCE OF REFERENCE LETTERS. 



(Drawings all on the same scale used in fig. i.) 



a. 



— actinosts. 



m. 



— maxillary. 



als. 



— alisphenoid. 



mpt. 



— metapterygoid. 



an. 



— angular. 



mspt 



— mesopterygoid. 



ar. 



— articular. 



na. 



— nasal. 



as. 



— anal spines. 



op. 



— operculum. 



bbr. 



— basibranchials. 



opo. 



— opisthotic. 



bo. 



— basioccipital. 



P- 



— parietal. 



brr. 



— branchiostegal rays. 



pa. 



— palatine. 



bs. 



— basisphenoid. 



pas. 



— parasphenoid. 



£br. 



— ceratobranchials. 



pel. 



— postclavicle. 



chy. 



— ceratohyal. 



pf. 



— prefrontal. 



cl. 



— clavicle. 



Pg- 



— pelvic girdle. 



d. 



— dentary. 



phbr 



— pharyngo-branchials 



ds. 



— dorsal spines. 



pm. 



— premaxillary. 



e. 



— ethmoid. 



pop. 



— preoperculum. 



ebr. 



— epibranchials. 



por. 



— preorbital. 



eo. 



— exoccipital. 



pot. 



— post-temporal. 



ephy 



— epihyal. 



pro. 



— prootic. 



epo. 



— epiotic. 



pto. 



— pterotic. 



epp. 



— epipleural. 



pt. 



— pterygoid. 



fr. 



— frontal. 



q- 



— quadrate. 



ghy- 



— glossohyal. 



r. 



— ribs. 



h. 



— hypural. 



sci. 



— supraclavicle. 



hbr. 



— hypobranchials. 



so. 



— supraoccipital. 



hhy. 



— hypohyal. 



sop. 



— suboperculum. 



hm. 



— hyomandibular. 



sor. 



— suborbital. 



hyc. 



— hypercoracoid. 



spo. 



— sphenotic. 



hype 



— hypocoracoid. 



sy. 



— symplectic. 



ihs. 



— interhsemal spines. 



uhy. 



— urohyal. 



ihy. 



— interhyal. 



v. 



— vomer. 



ins. 



— interneural spines. 



ve. 



— vertebrae. 



iop. 



_ — interoperculum. 



vf. 



— ventral fin. 



iph. 



— inferior pharyngeals. 







