Palaeontolosfie. 137 



'& 



is a seasonal rythm such as is found in Angiosperms. He concludes 

 that "the characteristic rythm in Calamite-stems corresponds to one 

 season's growth in length". M. C. Stopes. 



Johnson, T., Forbesia cancellata, gen. et sp. nov. iSphenopteriSr 

 sp. Bailv.) (Sei. Proc. Rov. Dublin Soc. Xlll. 13. p. 177— 183. pls. 

 13-14. 1912.) 



The new genus is based on three or four impressions originally 

 labelled b}' Bail}' as '' Sphenopteris sp." trom the Lower Carboni- 

 l'erous of Bandon, Co. Cork. The preseni author lays stress on 

 the fact that these plants show „the dififerentiation into axis and 

 leaf with cuneate segments very characteristically , but there is no 

 sign in it of the venation to be found in an ordinary Sphenoptens\ 

 "If it was a vascular plant, it had not yet deveioped a definite 

 vascular System, i.e. it was a vascular cryptogam without vascular 

 bundles". The plant branches dichotomousl3^ and 'axis' and 'leaf 

 are difhcult to distinguish from each other, both are described as 

 „honeycombed structures", consisting of "air Chambers partitioned 

 off from one another by septa". The author interprets the remains, 

 which the illustrations show as being ver}^ poorh^ preserved im 

 pressions, as the nearest known ty^pe of pteridophyte to the ancestral 

 form from which the Filicineae arose. M. C. Stopes." 



Johnson, T., Hetermigiiim hibernicum , s p. nov. a s e e d-b e a r i n g 

 Heterangium from Co. Cork. (Sei. Proc. Rov. Dublin Soc. 

 XIII. n.s. '20. p. 247—252. pls. 20—21, 1912.) 



Description of specimens in the Irish museum, consisting of 

 carbonaceous impressions of stem and attached leaf stalks; the 

 lamina is unrepresented. The presence of a spur like outgrowth 

 from the underside of each petiole is the chief character on which 

 the new species is founded. A sessile bod}' on the rachis is inter- 

 preted as a seed. M. C. Stopes. 



Thomas, H. H.. On some methods in Palaeobotanv. (New 

 Phytologist. XL 4. p. 109-114. 1912.] 



A brief account of several methods of preparing cuticles etc. ot 

 fossil plant impressions which have been recently brought before 

 palaeobotanists b}' the great Service they have rendered in Prof. 

 Nathorst's work. Most of these methods have been either divised 

 or improved by Prof. Nathorst. M. C. Stopes. 



Thomas, H. H., Stachypteris Hailei, a new Jura ssic Fern. (Proc. 

 Cambridge, phil. soc. vol. 16. part 7. p. 610 — 614. pl. IV. 1912.; 



Description of a specimen discovered by Dr. Halle at Whitby 

 as well as 2 further specimens found b\' the author near Saltburn. 

 The specimens are valuable because they show sori attached to the 

 laminas, in which the individual sporangia are clear, and from 

 which spores can be obtained bv suitable treatment. The species 

 is defined as follows: Fronds tri- or quadripinnate probably some- 

 what deltoid in outline. Axis of the frond slender. Pinnae of the 

 second Order divided into five or six pinnules and sometimes termi- 



