226 



LOWER I'XtCKXE FI.OKAS OF SOUTIIEASTKKN >;OKTll AMERICA. 



Tho ]irosont species is spariii<ily I'epresented 

 at the single locality eminicrated below. 



Occurrence. — Holly vSpriiigs sand, Oxford 

 ravine, Fayette County, Miss, (collected by 

 E. W. Bern). 



Collection. — U. S. National Museum. 



Genus MIMOSITES Bowerbank. 



.\pcx rounded : 



Leaflets ino(|uilateral and wilh a sluirt pctidlule. 



M'nnosifi's incijuilateralis. 

 Apex pointed: 



Hase about equally pointed, leaflet nearly equilateral 



and sessile Mimusites lanceolatvs. 



Base rounded, leaflet nearly equilateral and sessile. 



Mimoaites acacinfoliKS. 

 Base pointed, petiolulate, inequilateral. 



Mimosites lariah ilis. 



MlMOSlTES INEQUILATERALIS BciTy, 11. sp. 

 Plate XLV, figure V2. 



Description. — Leaflets elongate-elliptical in 

 outline, markedly inecjuilateral basall}", with a 

 short petiolule. Apex broadly romided. Base 

 in some specimens slightly narrower than the 

 apex and somewhat angular. Margins entire. 

 Texture subcoriaceous. Petiolule thick, about 

 1 millimeter in length. Midrib stout and 

 straight, promment on the lower surface of the 

 leaflet. Secondaries thm and mostly obsolete, 

 branchmg from the midrib at a wide angle, 

 considerably curved upward, camptodrome. 



This species is much like Mimosites variabilis 

 Berry, especially the larger leaflets of that 

 species, which, however, have an acute apex 

 and base and a longer petiolule. Mimosites 

 inequilateralis well deserves its name; for, 

 though the width of the laiuma is about the 

 same on both sides of the midrib, the outline 

 is markedly different, the apex and base being 

 ahiiost equally inequilateral. It is simdar to 

 many existing and fossil species of Mimosacete. 



Occurrence. — Lagrange formation (in beds of 

 Wilcox age), li miles west of Grand Junction, 

 in Fayette County, Tenn. (collected by E. W. 

 Berry). 



Collection. — L'. »S. National Museum. 



Mimosites lanceolatus Berry, n. sp. 



Plate XLV, figure 13. 



Description. — Leaflets lanceolate in outline, 

 the apf^x and base nearly equally acute, sessfle, 

 iKuirly ecjuilateral. Margins entire. Length 

 about 2.5 centimeters. Maximum width about 



7 iniflimeters, about lialfway between the apex 

 and the base. Midrib stout, promment on 

 lower surface of the leaflet, slightly cui'ved. 

 Secondaries thm, mostly obsolete, about eight 

 pau's, divergmg at an angle of about 70°, theu- 

 tips joined by arches. Texture subcoriaceous. 



This characteristic species of Mimosites is 

 distmguishable from the other species of Mimo- 

 sites found in the Wdcox as well as from the 

 associated Cfesalpiniacese by its strictly lanceo- 

 late, nearly equilateral form. 



Occurrence. — Lagrange formation (in beds 

 of Wilcox age), Ih mdes west of Grand Junc- 

 tion, in Fayette County, Tenn. (collected by 

 E. W. Berry). 



Collection. — U. S. National Museum. 



Mimosites acaciafolius Berry, n. sp. 

 Plate XLV, figure 14. 



Description. — Leaflets of different sizes, lan- 

 ceolate m outline, nearly ecjuflateral and 

 sessile, the apex sharply pomted and the base 

 broadly roxmded. Length ranges from L3 to 

 2 centimeters. Maxunum width, in middle 

 part of leaf, ranges from 3 to 5 mfllimeters. 

 Textiu'e subcoriaceous, but the flner venation 

 is more distinct than ui the other species of 

 Mimosites. Marguis full and entue. Midrib 

 stout and prominent on the lower suiface of 

 the leaflets. Secondaries very thin but dis- 

 tmct, numerous, branchmg from the midrib 

 at angles of about 45°, curvuig upward and 

 merging insensibly m the simflar camptodrome 

 tertiary system. 



This species is much like Mimosites varicu- 

 hilis Beny m appearance but may be dis- 

 tmguished by the absence of a petiolule, by 

 the roimded base, and by the more equilateral 

 form. Mimosites inequilateralis Berry differs 

 in having a romided a]iex, a short petiolule, 

 and an ineciiulateral form. Mimosites lanceo- 

 latus Beny, though equilateral and sessile, has 

 an ecjuaUy pointed a[K'X and base. 



In a niuuber of eliaracters Mimosites acacia- 

 folius resembles small leaflets of Gleditsio- 

 phyllum eocenicum Berry. This is especially 

 true of the venation. Gleditsiopliyllum eoceni- 

 cum is, however, comjiaiatively more elon- 

 gated and in general slightly falcate, more 

 inequdateial, and has a considerable petiolule; 

 its small(>r leaflet«, which approach Mimosites 

 acaciafolius ui sizi^, have an acute instead of a 

 romided base. 



