238 PROCEEDINGS OF THE ACADEMY OF 



We think the absence of ribs is sufficient to found a generic distinction on, 

 but this genus is also separated from Sigillaria, by the excess of the transverse 

 over the longitudinal diameter of the leaf-scar. 



A. camptotaenia, n. sp. Stem striate ; striae disposed in two series; 

 in the one, contiguous, numerous, descending towards the right; in the other, 

 few, and ascending towards the right; cicatrices sub-triangular rounded at apex, 

 acuminate at the base ; vascular scars almost obsolete. Locality and position 

 unknown. Cabinet of the Academy. 



A. ornitliicnoides, n. sp. Stem longitudinally striate, vascular cica- 

 trices three, linear, the middle much the longest. 



This is undoubtedly decorticated and the markings are often obscured by 

 adherent flakes of coal ; but the peculiar disposition of the scars render this 

 species very distinct. The middle impression projecting in front and behind 

 gives the scars an appearance resembling that of bird tracks,which is often height- 

 ened by short curved strias projecting from the side marks. Near the top and 

 bottom of the specimen are two large oval scars, which, perhaps, mark the 

 former position of branches; if so, this further separates this genus from Sigil- 

 laria, which Brongt. says do not branch. Locality, Milnes Mine, St. Clair. 

 Position unknown. Collection of the Academy. 



Syringodendron Sternb. 



Stem tree-like furrowed, costate ; cicatrices either single or double ; vascu- 

 lar scars for the most part wanting, but sometimes represented by a single 

 dot. 



This is a very poorly defined genus, and we think that at some future date it 

 will be broken up into several. We have seen no vascular scar in any speci- 

 men, and think that species possessing such will be found to have other char- 

 acters in common sufficient to warrant their erection into a distinct genus. 



For the present we follow Sternberg in dividing into two sub-genera a, 

 those with a single scar ; b, those with a double scar. 



S. m a g n i f i c a, n. sp. Stem not costate ; striate (when decorticated), bark 

 . very seldom preserved ; cicatrices double, oval, arranged in spiral, undulating 

 rows ten to fifteen lines apart. 



The distance between the pairs of scars is very variable, but never, in our 

 specimens, exceeding twice their length. The two scars are often fused into 

 one, with a broad disk of coal adherent. This species is seldom found with 

 the bark remaining, we have seen but a single very poor specimen of it in that 

 state. Owing to the absence of ribs, we think that it should not be classed in 

 this genus. But desiring to avoid creating genera unueccessarily, we place it 

 provisionally here. If other similar species should be found, constituting a 

 distinct group, we would propose the name of* Diplotaxis. 



Solenocla nobis. 



Stem ribbed, costre narrow, convex; furrows equalling in width the ribs; 

 cicatrices round, situated in the furrows between the ribs; vascular scars un- 

 known. 



We have created this genus to receive a very curious fossil from Schuylkill 

 Co., Pa. Although the specimen is large and very handsome, yet the cortex 

 is not sufficiently preserved, for us to note the form or even existence of vascu- 

 lar scars. 



S. psilophloeus, n. sp. Stem costata, costa convex, furrows and ribs 

 striate, bark thin, cicatices convex, situate in middle of the furrows. Locality, 

 Milnes Mine, St. Clair. Position, body of Mammoth Vein. Collection of the 

 Academy. 



Lepidodendron Sternb. 

 L. dubium n. sp. Cicatrices lance3late, approximate, strongly convex, 



[June, 



