DESCRIPTION OF TOE SPECIES. 323 



wood\' ; subordinate nerves strono- and cnrd-likc, ultimate reticulation 

 stron<^, with the nerves prominent and thread-like ; primary nerves gooff 

 from the midnerve at an angle of about 45^, sweejnng around to form 

 bow-shaped curves; they send off branches nearly at right angles, which 

 anastomose to form irregularly shaped, strongly defined meshes filled by 

 an ultimate reticulation which is very distinct and prominent, formed by 

 nerves meeting nearly at right angles 



Locality: 72d mile-post, near Brooke; rather common. 



This ])lant has a nervation so prominent and well characterized that a 

 small bit of it may be readily recognized. The fragments are so much 

 broken that little idea can be gotten from them of the shape of the leaf 

 They occur in the redeposited sand and clay. The fragmentary condition 

 of the fossils is perhaps partly due to the large size of the leaf That shown 

 in Fig. 3 seems to be a fragment from the central jiortion of the leaf It 

 may show a part of the midrib. That shown in Fig. 6 seems to come from 

 the lower left-hand portion of the leaf, apjjarently being a portion of a 

 basal aiiricle which is pressed against what seems to bo a part of the peti- 

 ole. This part of the leaf seems to have been crushed against the petiole 

 so as to cause the leaf to double over on itself The great size of the i)etiole 

 and that of the primary nerve in this figure indicate that the leaf must have 

 been very large. Fig. 5 seems to represent a fragment of the midrib, or of 

 a large primary nerve ; Fig. 4 gives a fragment apparentl}' from a basal 

 auricle, magnified three diameters to .show the nervation. 



HEDERJ^PIIYLLUM, gen. nov. 



The two species placed in this genus have the general character of 

 Hedera, but do not agree with it closely enough to unite them with this 

 genus. They apparently were but slightly developed, if we may judge 

 from the few specimens found. 



The genus may be characterized as containing leaves of rather small 

 size, rotundate in form, with nerves radiating from the base of the leaf, 

 the middle one being the strongest; petioles long and moderately strong; 

 leaf-substance thick. 



