No. 475] REVISION OF COMPTONIA 



499 



Comptonia gaudinii as here constituted, shows considerable 

 range, being represented as early as the Eocene by the leaf described 

 by Watelet which grew on the shores of the Suessonien Gulf, and 

 continued as late as the Miocene of Switzerland and Japan. 



Comptonia insignis (Lesq.) Berry 



Myrmi in^ujuis Lc..)., .1/,/,. ]{cp. U. S. (Uol. A (icoy. Surv. Terr., jar 



1874, p., 312, ISTO; Tertiary FL, p. 135, pi. 65, figs. 7, S, 187S. 

 Myrica alkalina Le^i., Crd. A Tcrt. FL, p. 149, pi. 45A, fig^. 10-15, IS^'A. 



I regard these two species of Lesquereux as most probably iden- 

 tical, for example his Figs. 13 and 15 of alkalltta are ])articiilarly 

 close to insignis, especially Fig. 15. It would reciuire bur a sliulit 

 increase in the lobation of the latter to produce the typical i/isk/his. 

 Other than this the remains of the two t'oruis arc exactly alike in 

 texture and venation, except that in insignis the midrib is moic 

 slender. As Lesquereux remarks, the leaves which he refers to 

 alkalina are of two types — ol)tuse, and acute-lobed, -the collecled 



rlvmc>, >omr leave hnuo ,„.nt<-K ii)].,-,! on one .i.lc and oIuum'Ix 

 on tlu- other. the i.-n,ain. arc all from .tiata of the ^..-n. a,r. 



ahhoiigh Alkali >tation, Wvo. i. .oine .KM) niih-. diMani f.om 

 Florivsant, Col., I ani Mill inclined m think that the leave, uhhh 



//<6V(7»z\s' is the nialiuv h'at\ for the\ aiv 1> iinicli more variable 



of their lobes, coml)ine(l with a narrower lamina, and (.>) thev 

 have a much thicker midrib. Thi. is e>peeiallv trne of Fii:. I.') 

 cited above. 



All of these are characters which >erve to mark the leave, ot ih.' 

 immature plants of the existinu' species. TouetluM' the.e two type, 

 of leaf show that a most beautiful specie, ot rather broail-lea\cii 

 Comptonia dwelt on the site of ihe present Koi'ky Mountains dur- 

 ing the early Tertiary. 



The venation which is well preserve<l, >hows a tyj)*' which is 

 quite characteristic of the ino.lern ( omptoina leaf. 



Les(iuercu\c(,mpare.a//.a/'//./\\ith ronlnhn>n n.^sKuuu^^. 



and with Mgrin, nngrri Ilerr Jarituala ['w^.^ to both of which 

 there is a passing resemblance that is by no means close, however. 



