Geology and Natural History. 405 



Its width was 350 feet at the top; over 300, in general, below; 

 over 400 where it turned at a right angle and entered the brook ; 

 its length on the mountain was half a mile ; to the foot of the 

 delta made by it nearly two miles. 



14. Titanichthys and Dinichthys from the Devonian of Ohio, 

 (Trans. N. Y. Acad. Sci., v, No. 2).— The Titanichthys, which 

 Dr. Newberry here describes, is a gigantic fish, much larger than 

 Dinichthys, the cranium being four feet broad (that of the largest 

 Dinichthys being three feet), to which he gives the specific name 

 T. Agassizii. It is from the Huron Shale, bordering Rocky River, 

 a few miles west of Cleveland. Besides Dinichthys Hertzeri, Dr. 

 Newberry mentions the discovery of D. Terrelli in the valleys of 

 Black and Vermillion Rivers, and two smaller species, D. minor 

 and D. corrugatus / also a fourth, D. Goiddii, at the Rocky River 

 locality. The last is remarkable for the size of the eye and for a 

 series of sclerotic plates, four inches in diameter, around the eye, 

 like those in Ichthyosaurus. He mentions that Coccostens has 

 recently been proved by Professor von Koenen, of Gottingen, to 

 have a bony ring round the eye. The same paper contains notes 

 on his Diplognathus mirabilis, also of the Dinichthys family. 



15. Catalogue of the Fossil Mammalia in the British Museum. 

 Part II, containing the Order Ungulata, Sub-order Artiodactyla ; 

 by R. Ltdbkkbr, F.G.S., etc. 320 pp. 8vo. London: 1885. — 

 This catalogue contains many descriptive notes on the species and 

 specimens in the collections of the British Museum, numbers of 

 them type specimens, which make it much more than a catalogue. 



16. Discussion on Climate and Cosmology • by James Croix, 

 LL.D., F.R.S. 328 pp. 8vo. Edinburgh, 1885.— Dr. Croll's 

 recent papers in this Journal make it only necessary to announce 

 the publication of this new volume, in which the views in those 

 papers are mostly embodied. 



17. Allgemeine und chemische Geologie von Justus Roth. 

 II Band, Zweite Abtheilung. — The continuation (see vol. vii, 493) 

 now issued of this important work carries the description of rocks 

 through the " younger eruptive rocks," which are discussed under 

 the heads sanidine rocks (l), the leucite and nepheline (2 and 3), 

 and the plagioclase rocks. 



18. On a crystalline slag having the composition of Fayalite ; 

 by Edo Claassen" (communicated). — The slag under examination 

 has an iron-black to steel-gray color and a metallic luster. Its 

 hardness is 5*5, its specific gravity 4*211. It is strongly mag- 

 netic, and gelatinizes with strong hydrochloric acid, though not 

 completely. Cavities in theslag occasionally contain prismatic 

 crystals, showing the forms i-2, 2-1, i-i (Dana's Mineralogy) and 

 aftording angles which agree closely with those of chrysolite. 

 Three analyses were made, one of which yielded the following 

 results : 



Si0 2 FeO A1 2 3 MnO CaO MgO K 2 Na 2 S 



28-16 68-39 T84 0-19 0-32 0-15 0-17 0-21 0-24 = 99-67 



The sulphur is probably combined with iron as FeS ; deducting 



