EXPLANATION OF LETTERING ON PLATES. 



A. — The cartilages, ligaments, and muscles. 



A. p. Ascending process of suspensor- 

 ium. 



A. s. c. Anterior semicircular canal. 

 At. Annulus tympanicus. 



B. Balancer. 



Bb. I, II, etc. Basibranchials I, II, etc. 

 Cb., cbr., I, II, etc. Ceratobrancliials I, 



II, etc. 

 Ch. Ceratohyal. 

 Ctr. Cornu trabeculae. 

 E. Br. I, II, etc. Epibrachials. 

 Ecor. Epicoracoid. 

 Epa. Ethmopalatine. 

 Epg. Epipterygoid. 

 Est. Epistapedial. 

 Eth. Pars ethmoidea. 

 Eu. Eustachian ligament. 

 HM. Hyomandibular. 

 HQ. Hyoquadrate ligament. 

 HS. Hyosuspensorial ligament. 

 Hsc. Horizontal semicircular canal. 

 II. Inferior labial. 

 Inc. Internasal cartilage. 

 LI. Lower labial. 

 Mh. Mandibulo-hyoid ligament. 

 MK. Meckels cartilage. 

 Mst. Mesostapedial. 

 Na. Nasal roof cartilages. 

 Nc. Notochord. 

 OG', OG^. Otoglossal: 1, cartilaginous; 



2, fibrous. 

 Pbc. Pubic cartilage. 

 Pea. Trabeculoquadrate cart. 

 Pd. Pedicle of suspensorium. 

 Pg. Pterygoid. 

 Proc. Procoracoid. 

 Psc. Posterior semicircular canal. 

 Q. Qc. Quadrate. 

 SI. Superior labial. 

 SSC. Suprascapula. 

 St. M. Musculus stapedius. 

 St. Stapes. 

 Tcr. Tegmen cranii. 



Tr. Trabeculum. 



Trab. Plate. Trabecular plate. 



T. ty. Tegmen tympani. 



B. — The hones. 



Als. Alisphenoid. 



Ang. Angular. 



a. r. ; a. r. t. Articulare. 



As. Astragalus. 



a. s. c. Anterior semicircular canal. 



a. t. r. Apex of trabecule. 



au. Auditory capsule. 



B. br. BasibrancMal. 



B. hy. Basihyal. 



B. o. Basioccipital. 



C. Urostyle. 

 Ca. Calcaneum. 



C. br. CeratobraucMal. 

 C. c. Centrale carpi. 



C. hy. Ceratohyal. 

 CI. Clavicle. 



Co. Columella. 

 Cor. Coracoid. 

 Cu. Cuneiform. 



D. Dentary. 



Di. Diapophysis. 

 Eb. Epibranchial. 

 Ecor. Epicoracoid. 



E. eth. Ectethmoid. 

 ep, Epiotic. 



Eth. Ethmoid. 

 ExO., Eo. Exoccipital. 

 f. Fibulare. 

 Fe. Femur. 



F. P. Frontoparietal. 

 Fr., F. Frontal. 



H. Humerus. 



H. hy, Hypohyal. 



Hy. Hypopophysis. 



I. Intermedium. 



H. Ilium. 



Int. Intercalare. 



Is. Ischium. 



1st. Interstapedial. 



493 



