vox Ettingshausen. — Fossil Flora of Keic Zealand. 301 



e latere externo sccundariorum sub angiilis acutis cxeuntibiis,. 

 simplicihus vel ramosis, inter se conjunctis ; reticnlo obsoleto. 



Locality : Pakawau, Nelsou (Cantei'bury Museum). [Ex 

 Coll. N.Z. Geol. Surv. ; Hector.] 



Corresponds somewhat to Ulmus inisca, Ung., of the fossil 

 species, but it deviates somewhat from this, as it is biserrate, 

 has a firmer texture, and the outer nerves of the lower second- 

 ary nerves are pronounced. Among the living species of Ulmus 

 the analogue of the species described might be found in the 

 division Microtela, which has firmer, almost leathery leaves ; 

 however, for a more searching comparison more complete and 

 better-preserved specimens than the fossils before me are 

 necessary. I class the small leaf (fig. 7), which shows so 

 plainly the characteristics of an Ulmits-leshf, with the same 

 species because it lies on the same stone together with the 

 large leaf (fig. 6), and with a few remains of leaves which, as 

 regards size, lie between the two leaves shown. 



This fossil plant is certainly a forerunner of the Uhmis 

 species. It seems that in the European Chalk formation the 

 genus Ulmoplijilon. is not wanting : later researches will pro- 

 bably prove this. 



Ulmophylon planeraefolium, sp. nov. 



Plate XXXII., figs. 2-5, 4«. 



U. foliis breviter loetiolatis, coriaceis, ovatis vel ovato- 

 oblongis, basi rotimdata csquali vel incequali, apice acuminatis, 

 margine crenatis vel irregnlariter obtuse dentatis ; ncrvatione 

 craspedodroma ; nervo primario prominente recto, excurrente ; 

 nervis secundariis sub angiilis 50°-6(P orientibus, prominenti- 

 hus, arcuatis simplicibus rarius ramosis ; nervis tertiariis e latere 

 extP'":io secundariorum angulis p)cracutis cgredientibus, approxi- 

 matis, subflcxuosis, fere transversim inter se conjunctis. 



Locality : Pakawau, Nelson (Canterburv Museum). [Ex 

 Coll. N.Z. Geol. Surv. ; Hector.] 



At the first glance these leaves have great similarity with 

 those of Plauera, from which they are however distinguished 

 by a leathery texture, and by the close, more pronounced ter- 

 tiary nerves, which run almost across the leaf (see enlarge- 

 ment, fig. ia). These essential differences made it seem 

 advisable to accept a distinct genus for the Chalk flora, from 

 which the genera Planera and Ulmus during the Tertiary 

 period proceeded. 



It is probable that in the fossil plant before us we have the 

 forerunner of Planera, as this seems to be indicated by the 

 shape of the serrae and several characteristics of the nervation. 



Planera antiqua, Heer, of the Patoot strata, may be con- 

 sidered as analogous to the species described. 



