Palaeontologie. 265 



cene Clays, it has hitherto been ver}^ dificult to ascertain which 

 horizon the remains really came from. More recent investigations 

 by Berry have shown conclusively, that the formation is really Plei- 

 stocene and the leaves are those of Tilia ainericana or T. hetero- 

 phylla. In the absence of sufficient data for specific Identification, 

 Newberry's specific name is retained provisionally, and the correct 

 citation for the present will be Tilia dubia (Newb.) Berry. 



D. P. Penhallow. 



Berry, E. W., Coastal-Plain Amber. (Torreya. VII. p. 4—6. 

 1907.) 



Attention is directed to the observations of Professor John 

 Finch on the Tertiär}^ Formations in America as embodied in a 

 paper published in 1824. Among other things he states that the 

 Plastic Claj^ and Sand Formation is characterized b}^ the presence of 

 lignites containing amber. More recent studies of the Magothy For- 

 mation show that amber constitutes one of the characteristic features 

 of the laminated lignite beds which mark the transition to the t3^pical 

 marine deposits of the Upper Cretaceous. It has been found 

 that amber occurs somewhat widely distributed throughout this 

 horizon, and in nearly all cases associated with fragments of char- 

 red wood. D. P. Penhallow. 



Berry, E. W., Recent Discussions of the Origin of the 

 Gymnosperms. (Science. N. S. XXV. 1906. p. 1 — 3.) 



The author takes exception to the present tendency among 

 some botanists, to make sweeping generalizations founded upon 

 insufficient evidence. These strictures are made with special reference 

 to a discussion at the Linnean Society with references to the origin 

 of the Gymnosperm, as reported in the New Phytologist, vol V. 



D. P. Penhallow. 



Chapman, F. and D. Mawson. On the Importance oi Halimeda^.'s, 

 a Reef-forming Organism, with a description of the 

 Halimeda-'Limestones of the new Hebrides. (Quart. Journ. 

 Geol. Soc. Vol. LXII. p. 702—711 with 3 plates. 1906.) 



This paper describes the occurrence and conditions of growth of 

 the living Halitneda, the distribution of Halimeda-'Limestones in 

 Christmas island, and various Pacific Islands, and contains füll 

 descriptions of similar limestones in the New Hebrides. 



Arber (Cambridge). 



Jeffrey, E. C, The Wound Reactions of Bmchyphyllum. (Ann. 

 of Bot., XX. 1906. p. 383-394. pl. XXVII— XXVIII.) 



The present studies are based upon a very large amount of 

 material representing the wood of Brachyphylluin from Cretaceous 

 deposits of somewhat extended geographical and stratigraphical 

 ränge, on the eastern coast of the United States, and it is there- 

 fore possible to enter into a consideration of the wound reactions 

 of the wood with some degree of thoroughness. This is all the more 

 possible because of the absence of any special resiniferous ducts or 

 Clements other than those which occur in the medullary rays. 



It is pointed out that in the absence of resiniferous elements 



