10 



Presents. 



[Jan. 6, 



preserved in shale, of Sphenopteris elegans, which display regular 

 transverse ridges crossing their stems and branches, which seem to 

 have been caused by the presence of bands of some hard substance, 

 corresponding exactly with those seen in the outer bark of both the 

 Heterangiums. These, at all events, are the only examples of fossil 

 Carboniferous plants, in which structures comparable with those of 

 the Heterangium stems have been discovered. It is not without sig- 

 nificance that H. Grievii has not only been found in the Westphalian 

 deposits of Pith Vollmond, but a German locality has furnished 

 Professor von Weiss, of Berlin, with specimens of Sphenopteris 

 elegans, having the same kind of bark as those found in Scotland. 

 The author suggests that the Heterangiums may possibly have been 

 ancestral forms, having exogenous stems and fern-like foliage, which 

 may have bequeathed the former features to some of the modern 

 Cycads, and the latter to the Ferns, the living Stangeria having 

 retained some of the features of both. 



Presents, January 6, 1887. 



Transactions. 



Baltimore : — Johns Hopkins University. Circular. Vol. VI. No. 53. 



4to. Baltimore 1886. The University. 



Berlin: — K. P. Akademie der Wissenschaften. Sitzungsberichte. 



1-38. 8vo. Berlinl886; Jacobi's Gesammelte Werke. Band IV. 



4to. Berlin 1886 ; Politische Correspondenz Friedrich's des 



Grossen. Band XIV. Large 8vo. Berlin 1886. The Academy. 

 Boston : — Society of Natural History. Memoirs. Vol. III. Nos. 12- 



13. 4to. Boston 1886 ; Proceedings. Vol. XXIII. Part 2. 8vo. 



Boston 1886. The Society. 



Brussels : — Academie Boyale de Medecine de Belgique. Bulletin. 



Annee 1886. Tome XX. Nos. 4-9. 8vo. Bruxelles 1886. 



The Academy. 



Academie Hoyale des Sciences. Bulletin. Annee 55. Nos. 4-10. 



8vo. Bruxelles 1886. The Academy. 



Cambridge, Mass : — Museum of Comparative Zoology. Bulletin. 



Vol. XIII. No. 1. 8vo. Cambridge 1886; Annual Report of 



the Curator, 1885-86. 8vo. Gam-bridge 1886. The Museum. 

 Davenport : — Academy of Natural Sciences. Proceedings. Vol. IV. 



8vo. Davenport 1886; The Academy. 



Gottingen : — Kon. Gesellschaft der Wissenschaften. Nachrichten. 



1886. Nos. 6-15. 8vo. Gottingen. The Society. 



Halle : — Verein fur Erdkunde. Mitteilungen. 1886. 8vo. Halle. 



The Union. 



Hamburg: — Naturhistorisches Museum. Bericht. 1885. 8vo. 

 Hamburg 1886. The Museum. 



