DESCRIPTION OF SPECIES— LONICERE^. 223 



Thf oldest type of Vibiininm is lliiil ol' llic Lan/anoide.s, represented in 

 the North American llora l)y VJiDitanoiihs, V.nioUe,i\nA V.denlaium. The spe- 

 cies here described are related to it, as is also the one descrii)ed in the Eocene 

 Sezanne Flora by Saporta, V. gigantnim, vvliose affinity with the plants from 

 Black Butt.es is marked. Dr. Newberry has described, from the Tertiary of 

 the Union group, two species with small leaves. Their relalioii to this sec- 

 tion is less positive; they rather seem allied to V. ni/di/w, var. pyrifoJium, of 

 the present North American flora. 



Viburntini iuar;;inaluni, Lesqx. 



Plate XXXVII, Fig. 11 ; Plate XXXVIII, Figs. 1-5. 



Tiburmm marginatam. Lesqx., Annual Report, l«7a, p. 395; 1873, p. 401 ; 1874, p. 306.— Sell., Pal. V6g6t., 

 iii, p. 601. 



Leaves of large .size, petiokd, broadly obovate, generally enlarged upward from the base and 

 round, subtruucate, .sbort-poiuted at the top, equally dentate from above the middle; basilar veins opi)o- 

 viU; oblique, r.iuiificd, as also Ibeir divisiou,s, craspedodrome. 



Most of the leaves representing this species are hirge, some still larger 

 than that of fig. 1, all recognizable by a black border, not inflated, surrounding 

 1 hem ; their consistence is rather thick, l)ul not coriaceous. Broadly cuneate to 

 the petiole, and widely enlarged toward the middle or higher above it, ihey are 

 either nearly truncate and short-pointed, or rounded to a point. The borders 

 are equally dentate, with short, regular teeth, turned outside, separated by 

 shallow sinuses, and each entered by the points of the nerves or of their 

 divisions. The nervation is strong and very distinct, generally blackened like 

 the borders; the basilar veins, opposite from quite near the base, very oblique, 

 25° to 30°, branch three or four times outside, the branches dividing once or 

 twice, as also the other lateral nerves, and thus all the divisions enter one of the 

 teeth. The principal nerves are joined by strong nervilles at right angles, and 

 generally simple; the details of areolation are obsolete. Fig. 11 of pi. xxxvii 

 is nearly entire, merely denticulate at the rounded toj), and thus the branches 

 of the lower nerves are camptodrome. This is evidently a mere deviation 

 from the general type, as we see in figs. 1 and 2 of i)l.xx.\viii the same character 

 marked by the tertiary nerves along the base as tar up as it is entire. This 

 leaf has been described in the Annual Report, 1872, p. .'JOG, as V. covtortuin. 

 A deviation of another kind is marked in fig. 3, where the lower })air of nerves 

 do not branch, but which has the teeth entered by divisions of the nervilles. 

 Fig. 4 re|^)resents a leiif with a comparatively long petiole. The connection, 

 where it is broken below the base of the leaf, is not clearly seen; the petiole 



