OLDKi; I'OTOMAC OF MKlilMA AND MAKVLAND. 493 



a series of .-ell-like mesl.os, sepnva.r.l l.v narrow raise.l, Ila. borders 

 ',u.h appear t<. lu- .h. nerves of ,!>. leaf. 'Phe spee.fie nan>e ol the plant 

 founc 1 on ,he eell-like ehara<-ter of the spaces between these nerves. 

 Jn,, ,„.shes -over tin- entire surfa.-e of the leaves. They are polygons 

 ,„,,., ,,, u>e n>eetin,, un.ler lar,e angles, of several suU.. he nun.ber 

 ,, U,e sides varies. They are n.ostly 5-S. but n,ay <---'-'l>^. ^ ;;X 

 Their siz<" also varies, son>e b.Mn, twire as large as others. ^^ .tin. the 

 nu-^hes an.l .roupe.l. radiating fron. a .vntral point, a., ruges or depres- 

 sions, aeeording to the relation of the fossU to the ongnud leaf. Depres- 

 sions seen, to have existed originally in the leaf and these leave elevations 

 ;„ the clav embedding the leaf. The nnn.ber of tlu-se rad.atn.g n.equal- 

 itios varies Thev are mostly o or under. The c-o,.cavities existmg on 

 ,1,: i,,f ,eem to be pn<-kers in Us thick texture. There is apparently 

 nothing like a differentiation of the nerves into grades, such as primary, 

 secondr.rv, etc. The flat, strong, cord-like margins or sides of the eels 

 form the whole of the nervation. But some of the margins of the cells^ 

 corresponding in position and placed in the central hne of the leaf, aie 

 so located as to seem to be continuations of one another and to form an 

 irregular flexuous midril>. This, however, is accidental and the margins 

 of the meshes are the only nerves possessed by the leaf The true posi- 

 tion of this peculiar leaf is very problematical. It is placed with doubt 

 in the genus Aristolochia>phyllum. . 



\. indicated 1)V Professor Ward, on the labels accompanymg this 

 plant \i has some resemblance to Heer's Kaidacarpum cretaceum," but it 

 is clearly not a fruit, as Heer considers that plant to be. 

 Celastropiiylhtm Biuttonianum Hollick.'' 

 PI. CVII, Fig. 7. 

 1895. CelastrovWl^mBriitonianum Hollick in Newberry: Flora ol-^ the Amboy Clays 

 (Monogr. U. S. Geol. Surv., Vol. XXVI), p. 105, pi. xlu, figs. 3. ,38, 4fa 4.. 

 1895. cLro;,ylU.m Britton^nnurn. Hollick. War^ The J^^^^^^;; 

 (Fifteenth Ann. Rep^.^^L Sui^v. 1893-94Ji^p^^49^58^377^378^.9. 



iTsTlw^rcr^ol VII(FloraderPatootschichten).p. 19, pi. Ixiv.fig. 91). ,,.,.„., 



47. T.,0 d..U.io. „.,.od. ...«». '■" ",;^"- ;;: ; J:ri" , . . o.tor.o~.to,y'„..i™, 



r;s:^:ri:i^tt=rs:.srr;;:::i.o.„.;.,,o,,,., r 



species persist into the Newer Potoinm- or Uaritnn formation.-L. 1'. \A . 



