NO. 2177. FOSSIL FISHES IN NATIONAL MUSEUM— EASTMAN. 253 



made up of four parts. There is certainly a well-ossified neural arch and above this 

 in some of the vertebrae at least a well-developed flattened neural spine. The teeth 

 have the enamel deeply folded at the bases as seen in the figtires given. 



This passage is followed by a detailed description of the pectoral 

 hmb in the type-specimen, now preserved in the American Museum 

 of Natural History; but there is no further discussion of the head 

 parts. Still more recently the limb structure of the Rhipidistia, as 

 exemplified by the same type-specimen ol Sauripterus has been made 

 the subject of searching investigation and comparison with other 



Fig. 7.— S.iUKirTLKUS tayloki Hall. Calskill, 1'ennsylvania. Restoration of the right pec- 

 toral LIMB, SEEN FROM THE INNER SIDE. TllE MESOPTERYGIAL SERIES IS REPRESENTED BY THE HU- 

 MERUS (H), ULNA (U) AND DISTALLY SUCCEEDING ELEMENTS; THE PREAXIAL RADIALS (R) ARE BARELY 

 REPRESENTED. THE SCAPULACORACOID, CLAVICLE (cv), SUPRACLEITHRUM (s. cl.), AND FIN RAYS ARE 

 CONJECTLTRALLY RESTORED FROM ANALOGY ■ft^TH RELATED GENERA. (AFTER W. K. GREGORY). 



ichthyic and tetrapod appendages in a paper published during the 

 present year by Dr. W. K. Gregory.* 



As a result of his investigations Dr. Gregory adopts the view, 

 already advocated by Doctor Broom, that the ascending blade in the 

 shoulder-girdle of Sauripterus (text lig. 6) represents the cleithrum of 

 primitive Stegocephali; and accordingly, he is able to recognize the 

 the following homologies of parts : 



RHIPIDISTIA. 



Interclavicular corium. 



Clavicle ( ' ' infraclavicle ") . 



Supraclei thrum ( ' ' supraclavicle " ) . 



Post-temporal . 



Coracoscapula. 



Fleshy lobe of fin. 



Mesopterygium (single basal piece). 



Mesopter>'o:ial axis. 



Preaxial parameres (radials) reduced or 



absent. 

 Postaxial parameres. 

 Dermal ravs. 



PRIMITIVE TETKAPODA. 



luterolavicle. 



Clavicle. 



?Fused Avith top of cleithrum. 



Lost. 



Coracoscapula. 



Arm and hand . 



Humerus. 



Humerus, ulna, ulnare, digit V (?) 



Lost. 



Radius, carpus, digits I-IV (?) 

 Lost. 



I Ann. N. Y. Acad. Sci., vol. 26, 1915, pp. 358-362, 



