31-i LOWEK KOCIlXE IM.OHAS Ol' SOUTIIEASTEKN XOUl U AMERICA. 



Genus LAURINOXYLON Felix. leaves, which were, how(>V(T, in place, whereas 



T » T i( the WDod was reworlied in the toi) of tlie .section 



Laiiuxoxylox bijaxxeki Knowlton. , .„ -, , ■• i i i ■ 



and nuiy he ol Claiborne age. it is mchided in 



Plate X\I, figures G-10. []^^, ^Yilcox fhira with a great deal of doubt. 

 Laiiri7wnjlon brannoi. Knowlton, Arkausa-s Gful. Sur- The second locality is in St. Francis County 



vey .\nn. Eept. for 1889, vol. 2, p. 2.3(), pi. 9, lige. and is at the top of the Yegua ("Coclcfield ") 



8, 9; pi. 10, fig.s. 1, 2; pi. 11, fig. 4, 1891. fornialion or probably at the base of the Jack- 



Penliallow, Koy. Soc. Canada Trans., 3d .er., vol. 1, ^^^^ formation. It has been reported by Pen- 



p. 98, figs. 6-8, 1908. ^^^^jj^^^^. ^.^.^^^^^ ^j^.^ Claiborne of Texa.?^ The 



Dfscrip^ion. —Knowlton's description, pub- gppcics is unique in having been the first ana- 



lished in 1891, is as follows: tomical (hcotyledonous species described from 



The annual ring can not 1)6 clearly distinguished, the United States. It was compared by 



although there are slight evidences of its having 1)een Knowlton with Laurus biseriata, descril)ed liy 



present. The wood cells are thick walled and ordinarily q^^ . j-^.^.j^^ ^Ire Tertiary of Russia, 



arranged in radial rows. The vessels are placed snigly or ' • ' , 



,. ,. , ,f 1 f.. Q ,,. vor^n- i Tiiev Occnrrenct. — U ucox(?) group, Bohvar Creek, 



arranged in radial rows of from 1 to 3 or rareU 4. iney t^ • ri , ^ 



are usually .separated !n- the medullary rays, although in near liarrisburg, Poinsett County, Ark. (coi- 



oue exce])lional instance a row of three vessels was in lected by R. E. Call). 



immediate contact with another row of four. \Mien single Collection. — U. S. National Museum, 



they are o\al in shape: when more than one, each is modi- 

 fied by pressure. The me<lullary rays as seen in this sec- Order MYBTALES. 

 tion are numerous; two cells l>road and usually hut little 



, . ^, . Family MYRTACE.a;. 



cur\-ed m their course. ■' 



On account of the poor state of preser^-ation it is difhcult Genus MYRCIA De Candolle. 



to make out the exact shape of the wood cells as seen in 



this section. Some of them have been rather short with Leaves elongated, linear-lanceolate: 



square ends, but probably the larger number ha^e had \Vith obtusely pointed tip Myrcia hentonensis. 



pointed ends. The medullary rays are in vertical plates Small, falcate, and acuminate .... ^fyrc!a grcnudcn.iis. 



of six to thirty or more rather" long cells, and so far as can Leaves small, obovate Myrcia parvifolia. 



be determined were not provided with pits or markings. Leaves ovate, acuminate ilyrcUi pvrycarensis. 



The lar^e vessels are, of course, very prominent in this Leaves lanceolate: 



section." They are long, rather thick walled, and provided Falcate, acuminate, marginal vein an appreciable 



with numerous ellii)tical or nearly circular bordered pits. distance from the margin Myrcia vera. 



This section, from another portion of the same specimen, Broader, equally pointed at both ends, marginal vein 



shows the wood cells clearly. Some have square and close to the margin Myrcia worthcni. 



others pointed extremities. The medullary rays are 



always arranged in two vertical series of from 6 to 30 or MYRCIA VERA Berry, n. sp. 



more cells. They are very numerous. * * * Plate XC figure 3. 



The large vessels are provided with net-form thickening ' " ' 



over the entire surface. It seems hardly prol)able that Description. — Small, narrow falcate leaves, 



the vessels have been provided with circular-bordered lanceolate in outline, the base pointed and tlie 



pits on one wall and with net-form thickenings on the ^. g|o,^„.^t(,f| .^^^ gradually narrowc.l, acumi- 



other, since there can be no satisfactory explanation o J £ centimeters. Maximum 



transition from one to the other in the same vessel, but naie. i^Lu^^iu o lu / < c ' ,• , + 



the fact remains that in all the instances in which it has width, in basal hall ot tile leat, 1 centimeter to 



been pos.«ible to make out the nature of the thickening on i Q centimeters. Margins entire, full and regu- 



the walls, the circular pits are always confined to the j^^^.j^ curved Petiole short. Midrib curved, 



radial walls and the net-form thickenings to the tangential ^^^^'^^ proximad, slender distad. S.-condaries 



^'^"*' . nearly regularly spaced, at intervals of 2 to 4 



This species was based on siUcilied specimens j)^iiii,',n>tcrs, diverging from tlie midrib at wide 



from two different horizons and probably rep- ^^^„l^,^ but' slightly curved upward in tlieir 



resented by poorly preserved lignitized material p^^^^.j^j.j coursTi, joining a strong marginal 



from whicli st-ctions were cut. The exact age ^^^^^ ^j^.^^^ ^^^.^^^^ ^^ j,p„j ,,l„ng ^\^^. margin and 1 



of these horizons can only bo approximately jj^iui^^ptei. from it in the proximal part of the 



determined. The beds in Poinsett County may j^^^^ l,ccoming closer in the tip; the marginal 



lie near the top of the Wilcox, since recent ^^.^^g diverge from the midrib at acute angles 



collections from this or a near-by locahty on ° ^ 



Bolivar Creek co ntain five Wil cox species of ^^--;^. -^ fl^i^'^r :n^,S^r^^r«^^ 



' Sec footnote :i, p. 174. 1S89. 



