1862.] DAWSON — DEYONIxiN PLANTS. 307 



preserved, but shows slender cylindrical fibres destitute of markings, 

 and with mere traces of medullary rays. The general arrangement 

 of parts resembles that in Prototaxites, but the markings on the cell- 

 walls are absent. I regard it as quite possible that this may merely 

 be wood of Dadoxylon or FrototcuvlteSy in which casts of the interior 

 cavities of the cells may have been taken in pyrites, while the cell- 

 walls and medullary rays have been destroyed, and the spaces 

 occupied by them partially obliterated by pressure. "Whatever its 

 precise character, it must have been an excurrent stem with many 

 small branches proceeding from it, in the manner of ordinary coni- 

 ferous trees*. 



In the collections made by Mr. Eichardson (of the Canadian Geo- 

 logical Survey) at Perry are fragments of stems or branches having 

 a structure somewhat similar to that above described, but still more 

 imperfectly preserved. 



(Sigillarice.) 



5. SlGILLAUlA PALPEBEA, Sp. nOV. PI. XIII. fig. 12. 



Ribs narrow, cibout a quarter of an incli in vddtli. Leaf -scars tranS" 

 versely acuminate, small. 



My only specimen is a small fragment, showing three or four ribs, 

 and with only a few of the scars preserved. The most perfect leaf- 

 scars are shaped much lilie a half-closed eye ; but the specimen is 

 only a cast, and very imperfect. Locality, St. John. 



6. SiGiLLAEiA Vanuxemii, Gceppert. PI. XII. fig. 7. 



HaU's ^Eeport Geol. New York,' p. 184, fig. 51; Goeppert's 

 * Flora Silurisch.' p. 546. 



Areoles hexagonal, rather longer than broad. Vascular scars indi- 

 stinct, apparently two in each areole. Baric thiclc. Ligneous sur-* 

 face obscurely ribbed, ivith small elongated scars in the furrows. 

 Woody axis sulcated longitudinally ; its diameter equal to one- 

 fourth that of the stem. There are ahout twelve rows of areoles on 

 a stem half an inch in diameter. 



This beautiful little Sigillaria is figured, but not named nor de- 

 scribed, in Yanuxem's * Report on the Geology of New York,' fig. 51, 

 p. 184. It is named and described by Goeppert from Yanuxem's 

 figure f. An examination of the original specimen — a sandstone-cast 

 six inches in length, imbedded among brachiopodous shells — enables 

 me to give the above more complete description. The bark is in a 

 coaly state, and the woody axis, though flattened, is quite manifest, 

 and still retains some carbonaceous matter, though destitute of struc- 

 ture. The plant must have been of slender growth, unless it were 

 a branching species. It approaches S. minima of Brongniart, but 

 is smaller and not ribbed ; in which last respect it resembles S. ele- 



* Similar stems, more nearly resembling those described by Unger in external 

 form, occur in the Catskill group. 



t * Flora der Silurischen,' &c. p. 546, 

 VOL. XVIII. — PAPvT I. Y * 



