60 pp. IlEPORT OFPROGIIESS. FONTAINE & WHITE. 



summit, and passing into simi^le pinnules, linear ; second- 

 ary racliis, slender ; pinnules, united at the base, oval, in- 

 clined forward, or falcate, becoming more united towards 

 the end of the x^innje, and towards the summit of the frond 

 or pinna, and smaller, until near the apex the ultimate 

 pinnjB liave passed into pinnules of the normal kind; low- 

 est pinnule on the lower side, heteromorphous, and ap- 

 proaching the character of Odontopteris, being also in- 

 serted partly on the primary rachis, and toward the sum- 

 mit of the frond having no mid-rib ; mid-nerve, well 

 marked, and splitting up towards the end ; lateral nerves, 

 numerous and going off from the mid-nerve at a very 

 acute angle, forking once dichotomously, the lowest branch 

 of the lowest nerve, on the ujiper side of the pinnule, turn- 

 ing up into the sinus of the united pinnules ; lateral nerves, 

 passing off from the princix)al racliis, one or more.) 



This singular plant combines with the tyjje of Callij)- 

 teridum some marked features belonging to Odontopteris, 

 as the great length of the i^innai, their peculiar method of 

 passing into pinnules near the summit of the frond, and 

 the heteromorphous lower pinnule. It is quite distinct 

 in facies from any other j)lant in the upper strata. The 

 texture of the pinnules seems to have been thin and deli- 

 cate, and the nerves, though slender, to have been shari3ly 

 defined. It was evidently a large arborescent plant, as the 

 fragment figured was only a primary pinna. 



Habitat. — Shales some 15 feet above the Waynesburg 

 Coal, near Arnettsville, West Virginia. 



CalUpteridium unitum, sj). nov., PI. XIV, Figs. 2 and 3. 



(Frond, tripinnate, or tripinnatifid ; pinnae, going off 

 acutely, somewdiat detlexed ; i)i*iin^iT rachis, stout and 

 rigid ; secondary rachis, rather slender ; pinnules, near the 

 base of tlie pinnai, and especially on the lower side, cor- 

 date-ovate, from the lamina} being constricted above the in- 

 sertion ; the rest, falcate, inclined forwards, all united, the 

 union increasing towards the ends of the pinna ; lowest 

 pinnule, on the lower side, usually deflexed along the pri- 

 mary rachis ; mid-nerve distinct, but soon dissolving into 



