232 MESOZOIC FLOKAS OF UNITED STATES. 



the Catalosciie of the United States Xational Museum, and Fig. 27 that 

 numl)ered 3997. l>oth of which were formerly referred to Aspidium 

 heterophyllum. Figs. 2S and 29 show, respectively, the specimens 

 originally refeiTed with doubt to Pecopteris strictinerris and Osmunda 

 dickson ioides. 



These fossils occm- at localities Xos. 9. IS. 19. 20. and 22. 



Most of the fossils occur at the locahties Xos. 9 and 22, V)eing most 

 niunerous at X'o. 9. 



Gleichzxia I Gilbert-Thompsoxi Fontaine n. sp.' 

 PI. LXVI. Fig. 11. 



The plant here regtu-ded as a new species was found by ^Ii'. Gilbert 

 Thompson in the Shasta formation of the Lower Cretaceous of California. 

 The locahty is Pettyjohn's ranch, 12 miles west of Red Blufif, Tehama 

 County. Cal. It was long ago submitted to Leo Lesquereux and Ijy 

 him determined as a Pecopteris. but without fixation of the species. 

 The specific name here assigned to it is derived from its discoverer. 



The plant, although in a fragmentary- condition, is well preserved 

 in the parts obtained and ver}- distinct. It is of a well-marked char- 

 acter or facies. which is not ver\- common in a formation so late as the 

 Shasta formation, but which is more characteristic of the Carboniferous 

 formation. It is not unlike Pecopteris arhorescem (Schloth.) Brongn. 

 of that formation. It is ob\-iously a new species. The fossil is preserved 

 in a fine-grained gray sandstone, which does not show any of the nei'\-es 

 of the pinnules except the midner\-es. A portion of the penultimate 

 rachis is preser\-ed and to this are attached a number of ultimate pinnse. 

 The penultimate rachis is strong, straight, and rigid. The ultimate 

 pinnte have none of their tips preserv'ed. They are linear and pecu- 

 Uarlv rigid in aspect and must have had strong rachises and been quite 

 long. Some of those that are preserved show a length of 6 cm., with 

 no diminution in the size of the pinnules. The pinnules are closely 

 crowded*, oblong in form, attached by the entire base and have ver\- 

 obtuse tips. From the base to the end of the pinnule the same width 

 is maintained, so that the margins are parallel. The texture of the 

 pinnules seems to have been thick and coriaceous. In each pinnule 



a See pp. 217-218. 



