Geology and Mineralogy. 403 



In vol. i, a single vertebrate bone fragment, 20 species of Trilo- 

 bites and 15 other Crustacea, 60 species Cephalopocls, 116 Gastro- 

 pods, are described. The second volume begins with the Lamelli- 

 branchs, of which 56 species are described, and the Brachiopods 

 are partly done, 86 species having already been noticed. David- 

 son, in 1882, in the supplement to the monograph on British 

 Devonian Brachiopocla, gave a list of sixty-two species from 

 Lummaton, based upon the material in Mr. Whidborne's and in 

 Mr. Vicary's collections, and some of the species were then de- 

 scribed, but here the species are figured and their relations to other 

 allied forms discussed. The monograph is a valuable contribution 

 to the precise definition of one of the standard faunas of the geo- 

 logical time scale; discussion of the fauna itself is reserved for 

 a future communication. h. s. w. 



4. Topaz from Texas ; by George F. Ktjnz, (communicated). 

 — Five crystals, all more or less rolled, showing that they had 

 been taken from the bed of some stream or brook, were lately sent 

 to Messrs. Tiffany & Company, of New York, on the supposition 

 that they might be diamonds. Four of these proved on examina- 

 tion to be topaz crystals. The largest one, of a faint pale green 

 color, with dull rubbed surfaces, somewhat rolled and fractured, 

 and slightly etched faces, resembled the more highly modified 

 crystals of this species from Alabashka in the Urals, and Colorado. 

 Its size was 17x16X1 2 mm . The following laces have been identi- 

 fied, and verified by measurements with the hand goniometer : — 

 the base, 0.0.1, domes 0.21, and 0.4.1, pyramids 1.1.1, and .121, 

 and prisms 1.1.0, and 1.2.0. 



Two crystals were white, with very little form, save that the 

 strong basal cleavage was very apparent. One of the smaller 

 ones was about 10 mm in diameter, very much etched, and resem- 

 bled the etched wine-colored crystals from Cheyenne Mountain, 

 Colorado. ISTo other information was given about them than that 

 they came from near Palestine, Texas, — evidently from the 

 granite rocks. 



This is the first noted occurrence of topaz in Texas ; and its 

 presence suggests that it may probably be found in connection 

 with other minerals associated with topaz and peculiar to the 

 Urals, Madagascar, Ceylon, and Oxford County, Maine. 



In December, 1893, my attention was called by Prof. William 

 H. Hobbs, Professor of mineralogy and metallurgy in the Uni- 

 versity of Wisconsin, at Madison, to a diamond that had been 

 found in Oregon township, two and one-half miles southwest of 

 Oregon village in Dane County, Wisconsin. Through his cour- 

 tesy, the stone was sent to me by the finder, Mr. Charles Devine 

 of the place just named. The diamond was found by him while 

 husking corn in October, 1893, in a rough, stony field which had 

 been under the plough for forty years. The bank of clayey earth 

 in which it was found contained a large number of rounded peb- 

 bles of quartz, but no other of the associated minerals of the dia- 

 mond ; and as the entire district consists of glacial drift coming 



Am. Jour. Scl— Third Series, Yol. XLVII, No. 281.— May, 1894. 

 27 



