5 = 



NEW YORK STATE MUSEUM 



Bothriolepis minor Leidy 

 1S89 Bothriolepis mi n o r /. S. Xewberry. U. S. Geol. Sur. Monogr. 16: 112, 



pi. 20, fig. 6-8 

 1S92 B o t h r 1 o 1 e ]i is minor E. I). Copi\ Am. Philos. Soc. Proc. t,q: 224 

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



p. 324, text fig. 5 



This species is readih" distinguished from the preceding by its smaller 



size and very much finer ornamentation, the external surface being covered 



with fine, closely crowded, vermiculating ridges. Unfortunately, it is 



known only by detached plates, amongst which the head 



and appendages are excessively rare. The latter are 



of about the same relative proportions as in B. n i t i d a. 



Concerning the head shield it is stated by Cope that 



" one of the characters of the species is seen in the 



fact that the sensory grooves of the median occipital 



plate do not extend to the smooth articular border, but 



are separated froin it by a band of sculpture. The pre- 



median plate is crossed by a groove which presents an 



abrupt loop backwards at the middle." 



Fi^. 13 B c h r i o 1 e p i s m i n o r 

 Newberry, .'\ntero-dorsome- 

 dian plate with denuded e.\- 



ternai ornamentation. Cats- ^^^ jg commouly tlic case In thls class of reuiaius, 



I Ida 



'"""'>. ^' ''^ the antero-dorsomedian plate is of more frequent occur- 



rence tlian an)- other, though seldom found entire. Its orientation may be 

 easily determined by means of the V-shaped sensory canals which diverge 

 from about the center of the plate, or, in case the superficial ornament is 

 denuded, b\- means of the longitudinal keel which traverses the median line 

 of the plate for about three fourths of its length. A specimen of this 

 character is illustrated in the accoinpanying text figure. 



Formation and locality. Chemung group of Bradford county, Pennsyl- 

 vania, and Catskill of Delaware county. New York. According to New- 

 berry, a species similar to this, and perhaps identical with it, occurs in the 

 Devonic of Belgium, 



