366 Systematic Paleontology 



rather remote, parallel, straight, and simple, running directly to the 

 margin. The latter is entire and often slightly revolute giving the 

 pinnules an acicular appearance. As preserved they range from 0.5 

 mm. to 1.75 mm. in width. The texture is coriaceous and the habit is 

 strict and rigid. 



This plant while not common is far from rare in the Patapsco forma- 

 tion to which it appears to be confined.^ It is quite different from any 

 fossil or recent plant known to the writer. It resembles somewhat the 

 Jurassic Stenopteris desmomera Saporta^ in form but it is decidedly 

 different in venation. Superficial resemblances to various other 

 described fossils might be pointed out, but they would be of slight value 

 or interest. 



Occurrence. — Patapsco Formation. Mt. Vernon, near Brooke, Vir- 

 ginia; Ft. Foote, Maryland. 



Collection. — ^U. S. National Museum. 



Genus CYCADEOSPERMUM Saporta 

 [PI. Jurass., tome ii, 1875, p. 235] 



This genus was founded by Saporta, in 1875, for the reception of 

 certain Jurassic 'seeds or ovules believed to be those of cycads, the type 

 species being Cycadino carpus hettangiensis Schimper from the infra 

 Lias of Hettange. It received the following characterization : " Semina 

 e carpophyllis distracta post maturationem in strata pervagata nunc 

 majora nunc plus minusve parvula, plerumque ovata ovatoque-oblonga 

 haud raro compressione mutua angulosa extus Isevia vel longitudinaliter 

 striata costataque, basi semper rotundiore insertionis cicatrice notata 

 apice autem plus minusve attenuata.'' 



Three other species were described at the same time, embracing forms 

 previously named Cycadocarpus by Saporta, Carpoliihes by Schenk, and 

 Ulospermum by Pomel. 



^ Through the kindness of Dr. Arthur Hollick I learn that this or a closely 

 allied form is present in his Cretaceous material from Alaska. 



^ Saporta, Plantes jurassique, tome 1, 1873, p. 292, Atlas, pi. xxxii, figs. 1, 

 2; pi. xxxiii, fig. 1. 



