736 SCIENTIFIC RECORD FOR 1885. 



Mackay, a. H. — Organic Siliceous Eemains in the Lake Deposits of 

 Nova Scotia. Canadian Bee. ScL, vol. i (1884-'85), pp. 236-244. 

 Montreal. 



Divides the deposits as follows : First, eartby muds ; second, black 

 or brownish slimy muds; third, whitish siliceous muds, consisting 

 nearly entirely of the cell-walls of the diatomaceae and the spicules of 

 fresh- water sponges, which are found to be present in classes first and 

 second also, although in less comparative abundance. Gives a list of 

 one hnndred and four species of diatomaceae identified from the sili- 

 ceous material ; also gives a list of the species of living sponges whose 

 spicules abound in the deposits. 



Marcou, Jules. — The Taconic System and its Position in Stratigraphic 

 Geology. I'roe. American Academy of Arts and Sciences, new series, 

 vol. XII, pp. 174-256. 1885. Cambridge. 

 Many lists of fossils are given. The "Taconic System" comprehends 

 all the strata in which the Primordial fauuaj are found. These fauuje 

 are three in number. The Infra-Primordial, including the most ancient 

 fossils of Newfoundland, among which as yet no trilobite has been found 

 with certainty. The Primordial fauna, properly so-called, that of Bo 

 hemia and Scandinavia, and which is represented in America by the 

 Paradoxides and Olenellus beds. The Supra-Primordial fauna, found 

 at Hof, in Bavaria, at Yestfosen, near Ghristiania, in Norway, and else- 

 where in Europe. On Lake Champlain it includes certain colonies of 

 the second fauna of Barrande, and is terminated by the "Potsdam sand- 

 stone," ini-ludiug the "Saratoga limestone," with Primordial fossils dis- 

 covered by Walcott. 



Marcou, J. B. — Progress of North American Invertebrate Palaeon- 

 tology for 1884. Amer. Nat., vol. xix, pp. 353-360. April, 1885. 

 Philadelphia. 



A brief sketch of the palaeontologic work done in 1884. A more ex- 

 tended review is published in the report of the Smithsonian Institution 

 for 1884. 



Marcou, J. B. — A Keview of the Progress of North American Inverte- 

 brate Pala3ontology for 1884, Smithsonian Report for 1884, No. 610, 

 pp. 1-20. (1885. Washington.) 



An attempt has been made to give a brief idea of the contents of 

 each work, the new genera and the species described, and the general 

 conclusions of the authors. 



Marcou, J. B. — (Progress of North American Invertebrate Palaeon- 

 tology for 1884.) Nature, vol. xxxii, p. 116. 1885. London and 

 New York. 

 Notice of Mr. Marcou's paper in the American Naturalist. 



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