270 



PBOCEEDINQS OF THE OEOLOOICAL SOCIETr. 



[Mar. 22, 



of the Upper Devonian, while those from Ohio are from a marine 

 limestone, belonging to the lower part of the Middle Devonian. 



1. Caulopteris Lockwoodi, n. sp. 



(Plate XII. figs. 1 to 3.) 



Trunk from two to three inches in diameter, rugose longitudinally. 

 Leaf-Bcars broad, rounded above, and radiatingly rugose, with an 

 irregular soar below, arranged spirally in about five ranks ; vascular 

 bundles not distinctly preserved. Petioles slender, much expanded 

 at the base, dividing at first in a pinnate manner, and afterwards 

 dichotomously. Ultimate pinnaj with remains of numerous, appa- 

 rently narrow pinnules. 



This stem is probably the upper part of one or other of the 

 species of Psaronius found in the same bed {P. erianus, Dawson, 

 MS.; and P. teostilis, Dawson, MS. *). It appears to have been 

 an erect stem imbedded in situ in sandstone, and preserved as a 

 cast. The stem is small, being only two inches, or a little more, in dia- 

 meter. It is coarsely wrinkled longitudinally, and covered with large 

 leaf-scars (fig. 2) each an inch in diameter, of a horseshoe-shape. 

 The petioles, five of which remain, separate from these scars with a di- 

 stinct articulation, except at one point near the base, where probably 

 a bundle or bundles of vessels passed into the petiole. They retain 

 their form at the attachment to the stem, but a little distance from 

 it they are flattened. They are inflated at the base, and somewhat 

 rapidly diminish in size. The leaf-scars vary in form, and are not 

 very distinct, but they appear to present a semicircular row of pits 

 above, largest in the middle. From these there proceed downward 

 a series of irregular furrows, converging to a second and more ob- 

 scure semicircle of pits, within or below which is the irregular scar 

 or break above referred to. The attitude and form of the petioles 

 will be seen from fig. 1 . 



The petioles are broken off" within a few inches of the stem ; but 

 other fragments found in the same beds appear to show their con- 

 tinuation, and some remains of their foliage. One specimen 

 shows a series of processes at the sides, which seem to be the 

 remains of small pinnae, or possibly of spines on the margin of 

 the petiole. Other fragments show the division of the frond, at 

 first in a pinnate manner, and subsequently by bifurcation ; and 

 some fragments show remains of pinnules, possibly of fertile pin- 

 nules. These are very indistinct, but would seem to show that 

 the plant upproached, in the form of its fronds and the arrange- 

 ment of its fructification, to the Cyclopterids of the subgenus Anei- 

 mites, one of which (Aneimites acadica), from the Lower Carbonife- 

 rous of Nova Scotia, I have elsewhere described as probably a tree 

 fern f. The fronds were evidently different from those of Archceo- 



* Memoir on Devonian Flora, Proceedings of Royal Society, May 1870. 

 t Qu«rt. Journ. Geol. Society, 1860. 



'^9ff 



