50 NEW YORK STATE MUSEUM 



Bothriolepis nitida Leidy 



Plate 3, figure 4; plate 7, figure i 



1856 Stenacanthus nitidus /. Leidy. Acad. Nat. Sci. Phila. Proc. 8:ii; 



Acad. Nat. Sci. Phila. Jour. [2 J 3: 164, pi. 16, fig. 7, 8 

 1856 Holoptychius americanus (pars) J. Leidy. Ibid. p. 163, pi. 17, fig. 4 

 1889 Bothriolepis leidyi /. S. Newberry. U. S. Geol. Sur. Monogr. 16: iii, 



pi. 18, fig. 2, pi. 20, fig. 1-5 

 1891 Holonema rugosa E. D. Cope (errore). U. S. Nat. Mus. Proc. 14: 456, 



pl- 3°, fig- 7 

 1893 Bothriolepis canadensis H. S. Williams (errore). Am. Jour. Sci. [3] 



p. 286, text fig. 5 



1899 Bothriolepis leidyi C. R. Eastman. N. Y. State Geol. 17th An. Rep't, 

 P- 324 



An imperfectly definable species known only by fragments of the 

 dermal armor and appendages. Superficial ornament consisting of fine 

 stellate tubercles fused into nodose vermicular ridges. Pineal plate rela- 

 tively large and of semicircular outline. Form and general proportions of 

 pectoral appendages as in the preceding species, except that only the 

 external margin is serrated. 



This species appears to have equaled, or even have exceeded the 

 average of B. canadensis in size, and displays a similar ornamentation. 

 The stellate character of the tubercles rarely appears in worn specimens, 

 and the ornament is coarser in large sized than in smaller or younger indi- 

 viduals. As indicated by a fragment of an extremely large example 

 belonging to the New York State Museum [pl. 7, fig. i], one that even 

 surpasses Asterolepis maxima in size, the appendages were attached 

 to the antero-ventrolateral plate considerably further back than is usual 

 amongst other species. The proximal portion of the limb in this particular 

 specimen has a width of no less than 2.4 centimeters. The " fore " arm of 

 another specimen belonging to the same museum is shown in plate 3, 

 figure 4, in which the pointed terminal portion is well preserved. Three 

 central elements can with difficulty be recognized besides the terminal, in 

 which case we should expect to find four marginals ; but neither in this 



