560 Notices of Memoirs — Dr. T. C. Winkler on Pterodactylus. 



in the sands when the tide has receded. The laws which govern 

 the flux and re-flux of tides do not, however, govern these. The 

 waters have not diminished nor drawn back. The land has risen. 

 . . . The lakes are being gradually filled with mud and > sediment ; 

 and every year, with the advance of settlement, the work of filling 

 up will proceed more rapidly." 



The principal geological features are described and illustrated by 

 sections. Reference is also made to the mineral wealth of the 

 district. Osmiridium has been collected in small quantities near 

 Stockyard Creek. Gold is being actively worked : while silver, tin, 

 copper, lead, antimony, zinc, bismuth, manganese, molybdenum and 

 iron are met with in places. 



T 



II, — A Sketch of the Geology of the Isle of Man. By John 

 HoKNE, F.G.S., of the Geological Survey of Scotland. (Trans. 

 Edinburgh Geol. Soc. vol. ii. part 3, 1874.) 

 HIS is an interesting sketch of the principal features of the 

 X geology of the Isle of Man. After indicating the previous 

 literature on the subject, the writer briefly refers to the Silurian 

 rocks, which may be of Lower Llandeilo and Lower Caradoc age. 

 Beds hitherto assigned to the Old Eed Sandstone period are included 

 under the heading of the Calciferous Sandstone series, which series, 

 as developed in Scotland, they resemble in lithological characters. 

 The Carboniferous Limestone series, forming three groups, is next 

 described ; and then follow descriptions of the igneous rocks. The 

 glacial phenomena of the Isle prove that it has been overflowed by 

 glacier ice. According to Mr. Home, the Till is in all respects 

 similar to the Scotch Till, and he observes abundant evidence of a 

 strange intermingling of foreign rocks in it, which must have 

 travelled from the coast of Cumberland, the south of Scotland, and 

 the north of Ireland. 



Ill, — Le Fterobactylus Kogei Dtr Musee Tetlee. Par Dr. T. C. 

 Winkler. (Haarlem, 1874.) 



AMONG the important additions obtained by the Directors of the 

 Teyler Museum, is a tolerably perfect specimen of a Ptero- 

 dactyle, from the Lithographic Stone of Bavaria, which has been 

 fully described by the indefatigable Curator, Dr. Winkler, in the 

 third volume of the Archives of the museum. 



The comparatively good state of preservation of the bones of the 

 skeleton has enabled the author to carefully compare them with the 

 bones of those species which have the greatest resemblance to it ; 

 these are the PL micronyx, von Meyer ; Pt. spectabilis, von Meyer ; 

 Ft. Meyeri, Miinst. ; and the Pt. Kochi, Wagner. In P. micronyx 

 (described in vol. iii. of the same Archives, 1870), the metacarpal 

 equals in length the bones of the fore-arm, the metatarsals are 

 small, the first is longer than the three others, even than the fourth ; 

 in this specimen the metacarpal bones are shorter than those of the 

 fore-arm, and the metatarsals are even longer and thicker. This 



