340 mp:sozoic floras of united states. 



member occur there also. Tlie plant. F?-eit('l(>psis variatifi. foimd in hotli tlie Arkan- 

 sas and the Texas beds, is a pecuHar one. and is so stronjiiy cliaracterized that it 

 can not be mistaken. 



Dr. Johannes Felix collected from Neocomian strata of Tlaxiaco, 

 Mexico, certain apparently jointed stems closely resembling those found 

 hi the Trinit.y and Glen Rose Ijeds, which were described and figured in 1893 

 by Dr. A. G. Nathorst," who considered them a new genus which he named 

 Pseud of renelopsis, the species being named P. Fcli.vi. Nathorst, how- 

 ever, had not seen Professor Fontaine's paper on the Glen Rose flora, 

 which appeared about the same time as the work of I'elix and Lenk, but he 

 regarded the form as generically the same as the Frenelopsis parcemmosa 

 of Fontaine from the Potomac formation. A comparison of his figures, 

 however, indicates that the Mexican plant is different from either the 

 \'irginia or the Texas-Arkansas form, and the last named is certainly 

 jointed, and therefoi-e, according to Nathorst, a true Frenelopsis. 



I have not included the Tlaxiaco flora in this paper, although l)elong- 

 ing to the Lower Cretaceous of North America; I will therefore add that 

 Ijesides the Pseudof renelopsis Felixi, Nathorst descril^es coniferous twigs 

 which he compares with Sequoia ambigua Heer and S. Reichenbachi (Gein.) 

 Heer. 



The Trinity lieds of Arkansas have yielded one other vegetal^le form 

 that has not yet been mentioned, liecause, although collected by Mr. Hill 

 in 1888, it was not described till 1895. The material in which it occurs 

 was placed in Doctor Knowlton's hands, and this form is mentioned in 

 a letter from the latter to Mr. Hill, which was appended as a footnote 

 to tiie chapter on the paleontology of the Trinity division (Chap. XHI, 

 p. 152) of the Annual Report of the Geological Survey of Arkansas, Vol. 

 II. in which Doctor Knowlton says: 



There was a very interestinu; thino; in some of the clayey material. It was 

 thickly filled with stems, as you may remember. I selected a few of them, boiled 

 them out in nitric acid, and mounted them in Canada balsam, when the structure 

 was l)rought out most clearly. It is something new, evidently, and .so far as I could 

 find in the time I was able to give the subject, is undescribed. I have not decided 

 what to call it, and indeed a mere description, without accompanying plates, would 

 be of very little scientific value. 



" I'llimzcnreste aus dem Neocom von Tlaxiaco, by A.»G. Nathorst in Beitrage zur Geologie und Paliion- 

 tologie dcr Repiil)lik Mexico, von .1. I'Vlix und H. Lenk, H. Tlieil, Leipzig, 1893, pp. 51-54. See p. 52, figs. 6-9. 



