356 Prof. Owen's Description of the Lepidosiren annectens. 



Fig. 4. Side view of the skeleton oi Lepidosiren annectens. 



a. Cartilaginous vertebral style, or ' chorda dorsalis," representing 



the bodies of the vertebrae. 



b. Superior laminae, or neurapophyses of the vertebrae. 



c. Neurapophysial spines. 



d. Dermal neurapophysial spines. 



e. Inferior arches, or haemapophyses of the caudal vertebrae. 



f. Haemapophysial spines. 



g. Dermal haemapophysial spines. 

 h. Basi-occipito-sphaenoidal bone. 

 i. Ex-ocoipital bone. 



k. Parietal bone. 

 I. Frontal bone. 

 m. Posterior frontal bone. 

 n. Intermaxillary bone, 

 o. Maxillo-pterygoidian bone. 

 p. Tympanic hone. 

 q. Articular, and r. dentary, elements of the inferior maxillary 



bone. 

 *. Pre-opercular bone. 

 t. Stylo-hyoid bone. 

 u. Cerato-hyoid bone. 

 V. Scapulo-coracoid bone. 

 w. Jointed cartilaginous ray of pectoral fin. 

 X. Ribs, ] 



y. Pelvic cartilage. 



z. Jointed cartilaginous ray of ventral fin. 

 a. Intermaxillary teeth. 

 |3. Dental plate of upper jaw. 

 y. Dental plate of lower jaw. 



5. Upper surface of the skull. 



6. Superior or internal surface of the basi-occipito-sphenoidal bone ; na- 



tural size. 



7. Inferior surface of the lower jaw ; two thirds natural size. 



