468 PROFESSOR HEER ON THE EOSSIL FLORA OF NORTH GREENLAND. 
The warts are round, and of different sizes. Very like C. borealis, Hr. (FI. Foss. Arct. 
p. 145) and C. dubius, Hr., but much more deeply striated. The systematic position of 
Caulinites is still very doubtful. 
XI. StYRACIFLUAE. 
23. Liquidambar eurojpoeum, A. Br., Plate XLI. fig. 13. Hr. FI. Tert. Helv. ii. p. 6. 
The large slab (Plate XLI.) contains a strongly compressed, though distinctly lobed 
leaf, agreeing with the 5-lobed leaf of Liquidambar, and resembling the leaf from 
GEningen, represented in my ‘Flora’ (Tert. Helv. pi. li. fig. 4.). The lower lobe is best 
preserved, the fine teeth are indicated at some places ; it is tapered outwards. The 
margin of the other lobe is for the most part .obliterated. 
XII. Salicineae. 
24. Pojpulus Bichardsoni, Hr., Plates XLIV. figs. 7, 8, 9 ; LY. 3 b. Hr. FI. Foss. Arct, 
p. 98, pis. iv. figs. 1-4; vi. 7, 8; xv. 1, c. 
The collection contains many leaves of this common Miocene tree of North Green- 
land. Plate XLIV. fig. 8 a is a small one. All the teeth are rounded, as in Pojpulus 
tremula , L. The nervation is very well preserved. Figs. 7 & 9 a show the long and 
slender petiole. A portion of a leaf, with a petiole 70 millims. long is beside the Cau- 
linites costatus. Plate LY. fig. 3 b represents a very large leaf, 143 millims. long, and 
probably 130 broad, the base emarginate. Fig. 4 is probably the branch of a poplar ; 
the bark shows transverse and longitudinal undulated stripes and ribs. 
25. Populus Zaddaclii , Hr., Plates XLIII. fig. 15 a; XLIV. 6. Hr. FI. Foss. Arct. 
p. 98, pis. vi. figs. 1-4 ; xv. 1 b. Hab. Atanekerdluk. 
Plate XLIV. fig. 6 is a fine leaf, Avith many small teeth. They are bent toAvards the 
apex, and every one has a small gland, exactly as in the leaves from Samland (pis. v. and 
vi. of my ‘Miocene Baltic Flora’). Plate XLIV. fig. 6 agrees with pi. vi. fig. 5 of my 
Baltic Flora,’ and Plate XLIII. fig. 15 a with pi. A 7 i. fig. 4. 
26. Populus arctica, Hr., Plates XLIII. figs. 14 ; LII. 8 b ; LIII. 4 b. Hr. FI. Foss. 
Arct. p. 100, pis. iv. figs. 6, 7 ; v., vi. 5 b; viii. 5 b ; xvii. 5 b, c. 
Common at Atanekerdluk. The collection contains various forms. Plate LIII. fig. 
4 b is a leaf Avith an entire margin and an obtuse base. 
I consider Plate XLIII. fig. 14 to be a young leaf of Pojpulus arctica. It has= a long 
petiole, dilated at the base. The margin is not toothed. Five almost equally strong 
principal nerves spring from the base of the leaf. The collection contains tAVO such 
small leaves. 
Populus pruinosa, Schrenk (Songorei), seems to be the nearest species. 
