PLANTS. 335 



impressions which occur in sandstones of the age of the Chemung group 

 near Salamanca, N. Y., and which closely resemble the foot-prints of 

 an unshod horse. The authors believe these impressions to have been 

 produced by the roots of a marine plant ; and they define the genus as 

 follows: — "Marine plants, having swelling roots, which are laterally 

 expanded in the form of a subcircular disk, with one edge truncate, 

 and having the upper and lower surfaces deeply impressed, leaving a 

 thickened rounded rim to form the margin of the disk, except on the 

 truncate portion, where the substance becomes thin and attenuated, and 

 the central depression opens out to the margin." The name Hippo- 

 dophycus Cowlesi is given to the only known species. H. A. N. 



Heer, Prof. 0. Fossile Pflanzen von Sumatra. [Fossil Plants of 



Sumatra.] Abh. Schweiz. palaeont. Gesell. vol. i. pp. 1-19, plates 



i.-iii. 



The plants are Tertiary, most probably Miocene. 13 species are 



described. Two of these species had already been found in Java, and 



described by Goeppert, Xyhrmtes stigmariceformis and Daplinophyllum 



Beilechmiedioides. The others are new, viz. Casuarina Padangiana, 



Ficus tremiUa, F. Verheekiana, Diospyros Homeric Apocynophyllum 



Sumatrense, Dipterocarpus Verbeekianus, Sapindus macrophyllus, KhiLS 



hidens, Dalbergia grandifolia, Carpolithes umhilicatulus, and G. radiaius. 



W. C. 



. Anmarkningar ofver de af svenska polarexpeditionen 1872- 



1873 upp.-tackte fossila viixter. [Remark on the fossil plants 

 collected by the Swedish Polar expeditions.] Ofver. k. Yet. Akad. 

 Forhandl. no. 1, pp. 25-32. 



Helmhacker, R. Beitrage zur Kentniss der Flora des Siidrandes 

 der oberschlesisch-polnischen Steinkohlenformation. Jahrb. k.-k. 

 Bergakad. Heft i., and Yerh. k.-k. geol. Reichs. p. 44. 



Hodges, Prof. On the Petrified Wood of Lough Neagh. Coll. Guard, 

 vol. xxviii. p. 452. [Brit. Assoc] 



As the mineralization of the wood has been popularly attributed to 

 the action- of the waters of the lake, the author has analyzed the water 

 taken from several parts, and finds that it contains only an inconsider- 

 able amount of solid matter. He also publishes an analysis of the 

 wood, which shows that the structure has been replaced by silica, and 

 not, as some have maintained, by oxide of iron. One specimen of the 

 wood yielded 89*01, and another 84*5 per cent, of silica. F. W. R. 



Jones, Prof. T. R. Gyrogonites, &c., in the London Clay. Geol. 

 dec. 2, vol. i. p. 479. 



Mentions the discovery of Gyrogonites (seed-vessels of Ghara) in the 

 London Clay of Islington, associated with Foraminifera and Entoraos- 

 traca, and referable to two species — one resembling Ghara helicteres, 

 the other G. Lyellii. From the same source Mr. Wright has also added 

 Gy there plicata, Munstor, to the fauna of the London Clay. W. T. 



