Palaeontologie. 637 



like a synangium, and is generally as concrescent vvith the nu- 

 celliis as the menibers of a synangium are with one another. 



Arber (Cambridge). 



Scott, D. H., On the occurrence of Siji^illariopsis in the 

 Low er Goal Measures of Br itain. (Annals of Bot. 

 Vol. XVIIl. p. 519—521. 1904.) 



This note describes the first British specimens of Sigillarl- 

 opsis, of which two specimens have recently been obtained 

 from the Goal Measures of Lancashire. The first of these shows 

 two leaves, both in transverse section. The larger is about 

 4 mm. wide, by 1.4 mm. in thickness. The iower surface is 

 strongly convex, the upper more or less flat, but with a 

 shallow median depression. The leaf thins out rapidly towards 

 its edges, and on each side is a deep and narrow furrow, on 

 the margins of which stomata appear to have been placed. 

 Thus the form of the section is that characteristic of the leaves 

 of Lepidodendron, and Slglllarla. 



The mesophyll has a well-marked palisade-layer on the 

 Upper side, and, in the narrow wings of the leaf, characteristic 

 spongy parenchyma is present. There are two vascular bundies 

 in the central region with their xylem-groups widely separated. 

 Below each bündle is a broad band of dark, apparently scle- 

 rotic tissue. The transfusion tissue is extremely well developed, 

 and has the form of a horse-shoe, embracing the whole Iower 

 side of the central region, and approaching the bundies at its 

 two upper extremities. The new specific name Sigillariopsis 

 snlcata is proposed for this specimen. 



In the second specimen the leaf has a different sectional 

 form, the upper surface being markedly concave. There is a 

 Sharp median depression on the upper side, and a narrow dorsal 

 rib on the opposite surface, but little trace of lateral furrows. 

 The two vascular bundies are quite separate, though not so far 

 apart as in the previous specimen. As a whole this specimen 

 makes the Impression of being less highly differentiated than 

 the first described here, with which it may or may not prove 

 to be identical. 



At present no stem has been correlated with these leaves. 

 Both the specimens are, however, specifically different from 

 Renault's 6". DecaisneL and are from much older rocks. It 

 is proposed to more fully describe and illustrate these leaves 

 on another occasion. Arber (Cambridge). 



Seward, A. C, Catalogue of the Mesozoic Plants in 

 the Department of Geolog y, British Museum 

 (Natural History). The Jurassic Flo r a. II. Liassic 

 and Oolitic Floras of England (excluding the In- 

 ferior Oolite Plants of the Yorkshire coast) p. I 

 —XVI, 1 — 192, with XIII plates, and 20 text-figures. 1904. 



