DEVONIC FISHES OF THE NEW YORK FORMATIONS 29 



and alleged appendages of this form, the following brief notice may be 

 given of it here. 



Palaeaspis americana Claypole 

 1884 Palaeaspis americana E. ]V. Claypole. Am. Nat. 18: 1224 



1 884 Palaeaspis bitruncata E. W Claypole. Ibid. p. 1224 



1885 Palaeaspis americana E. W. Claypole. Geol. Soc. Qiiar. Jour. 41:62, 

 woodcut fig. 7 



1885 Palaeaspis bitruncata E. W. Claypole. Ibid. p. 62, woodcut fig. 8 



1 885 Palaeaspis bitruncata and P. e 1 1 i p t i c a E. W. Claypole. Am. Ass'n 



Adv. Sci. Phila. Meeting Proc. p. 426 

 1885 Palaeaspis elliptica E. W. Claypole. Brit. Ass'n Adv. Sci. Montreal 



Meeting Rep't, p. 733 



1892 Palaeaspis americana E. W. Claypole. Geol. Soc. Quar. Jour. 48: 561, 

 fig. 8 



1893 Palaeaspis americana E. W. Claypole. Am. Nat. 27:375 



1895 P al a e as p i s a m e r i c an a ^. Z'^a«. Fishes, Living and Fossil, p. 71 

 1898 Palaeaspis americana A. S. Woodward. Outlines of Vertebrate Palae- 

 ontology, p. 6 



This species, which differs from the British P. s e r i c e a only in minor 



particulars, is known by a few imperfect specimens, one or two of which 



Fig. 4 Pteraspis rostrata Agassiz. Lower Old Red sandstone ; Great Britain. Lateral aspect of partially restored 

 individual, x ^ 



have the dorsal and ventral shields preserved in natural association. The 

 dorsal shield resembles that of Pteraspis [text fig. 4] in form, but apparently 

 consists of a single plate, and is destitute of a posterior median spine. The 

 orbits, also, are not completely inclosed. In the original description, the 

 dorsal and ventral shields were described under different names. Subse- 

 quently, however, the form named P. bitruncata was determined to be 

 the ventral shield of P. americana, and the title proposed for it dropped. 

 The undefined name of "P. elliptica" is probably to be regarded as a 

 synonym of P. americana. 



