^^i89Y''] PKO('i-:i;DiNiiS OF Tin-: national ^muj^kum. 275 



(liatc in type b('t\\ ecu F. luuno.sis.sivia* of tlic Potomac t'oriMutioii and 

 F. 2)f(rrcraiii(>sa, since it has tlic considerable development ol' Avoody 

 tissue, iiud the wliorls of three leaves on the joints, possessed by the 

 former, with the character of jointing and general aspect of the latter. 



It is interesting to note that F. 2i<(>'('er((>H0sa occurs in the Potomac; 

 formation of Virginia in only one h)calityt in company with plants 

 of a tyi)e strikingly likc! those associated with the Texas species. 

 This locality is the "Entrance to Trent's lleach," on James Eiver, 

 where Diooiiitcs BucJiiauH.s^ lirachi/phijUion crassicnnh^ WiUUinisonUi 

 rirpiniciisis, etc., are also found. Bakropsis iduripaftita \va . found at 

 this locality, and it is probable that it will yet be found to exist iu the 

 Trinity tlora. 



F. varians is one of the most common fossils in the Glen Rose collec- 

 tion. 



Freuelopsis Hoheneggeri (Ett.) >Stheuk. 



I'l. XLli, Fi<;'.s. 1, \u. 



The specimen given in PI. XLii, Fig. 4, is the only o\io of the kind that 

 was found in the (Hen Eose fossils. It has all the characters of 

 Schenk's plant, and <litfers decidedly from the numerous specimens of 

 F. varians, among which it was found. 



The specimens of F. rari((ii.s are black in color, while this is brown. 

 The twigs have a larger woody axis than that found in the more com- 

 mou plant. The tubercles are larger, so that the lines formed by them 

 are distinctly seen with the unassisted eye, which is not the case with 

 F. varians, and the general aspect of the twigs is more rigid. But 

 more important than these features is the fact that the summits of all 

 the joints bear distinctly <leveloped leaves. These have the characters 

 seen in F. parccramosa and 7'^ Jlolicnegfjeri, i. e., tlu^y are short and 

 triangular in foiiii. They differ from thos(5 of the former plant, ;uid 

 agree with those of the latter in the im[)oitaiit feature that they occur 

 in whorls of three. Two of these leaves occur on the up])er face of the 

 lowest joint of the specimen, and arc represented in PI. vir. Fig. irt, 

 which gives a portion of the stem enlaigcd to show tlu^ character of the 

 leaves. Tlu; leaves alt(;rnate in i)osition in the successive whorls, and 

 resemble clearly those given by Schenk for F. Hoheneggeri. X The fig- 

 ure of this jdaut, giveu (PI. vi. Fig. 1) in Schenk's work, shows on the 

 second ultimate twig attached to the main steai on the left-hand side, 

 counting from the bottom of the figure, a single triangular leaf, and on 

 the joint next above these are two leaves of the same character that 

 alternate in position with the one below. On the joint above these 

 there is again a single leaf. This shows that the leaves of ^. Hoheneg- 



* M(>iioKr:>])h xv, U. S. Ocolo,i;ical Survey, Pint i, text, jip- LM5-218. 



tlbid., ].. L'20. 



t ■' Die IbssihMi I'tlauziMi der Wurusilorfcr Schichtcii." I'l. \'i, Fig. 1. 



