APPENDIX. XVI 



The specimens of this species do not occur directly associated 

 with the other plants described in this paper, but at a somewhat 

 higher geological horizon, about one or two hundred yards fur- 

 ther eastward. 



Carpolithes ? 



PI. I, fig. 4. 



These bodies may or may not be fruits, as they are too im- 

 perfectly preserved and defined to be satisfactorily determined. 

 They seem to have been vesicular, or, at any rate, to have pos- 

 sessed little solid substance, as they are almost entirely flattened 

 by pressure. As thus seen flattened in the matrix, they most 

 generally pi-esent a spatulate outline, and vary in length from 1 

 inch to 1.60 inches, and from 0.20 to 0.30 inch in breadth, the 

 widest part being generally near one end ; v/hile the opposite 

 end is sometimes abruptly pointed, and the other usually more 

 obtuse, or more or less rounded. They show no surface markings 

 of any kind. 



Cyclopteris ? (Arch^^opteris) Lescuriana, M. 



PI. II, fig. 1, a, h, c. 



Frond tripinnatc,* attaining a large size, primary pinnae lance- 

 ovate or lanceolate in general outline, with a moderately stout, 

 straight, somewhat rugose rachis. Secondary pinnse regularly 

 alternating, rather approximate, lanceolate, nearly straight or a 

 little arched upward, with a slender, very slightly flexuous rachis, 

 that diverges from the secondary one at distinctly less than a 

 right angle. Tertiary divisions or pinnules regularly alternating, 

 narrowed below to the short oblique petiole, the lower or inner 

 ones being deeply divided into from three to five (rarely six) 

 alternating, moderately divergent, narrow sublanceolate, simple, 

 or rarely dentate leaflets ; upper ones gradually becoming less 

 and less divided, until they pass into merely slightly dentate, or 

 simple lanceolate forms that are more oblique to, and slightly 

 decurrent upon, the rachis. Nervation rather obscure ; nerves 

 not very numerous, moderately diverging, and apparently several 

 times bifurcating, f 



* The descriptions of this and tlie following species, are drawn up 

 under the supposition tliat the lara;est specimens found are not fronds, 

 but more divisions of the same. If they should be found to be entire 

 frondri, however, of conrse the description would have to be modified to 

 correspond, as in that case the species should be described as bi-pinnate, 

 and the division termed secondary pinna, would be primary, etc. 



t In some of the specimens the upper side of the pinnules can be seen 

 under a strong magnifier in a cross light, to be covered by numerous 

 extremely minute, crowded longitudinal striae, apparently independent of 

 the nervation. These striae can be traced down the narrowed base, or 

 petiole, upon and along the rachis. 



S7 (^1> 



