136 



REPORT OF NATIONAL MUSEUM, 1909. 



Rose, Joseph N. New species of 

 Opuutia from Arizona. 



Conir. U.S. Nat. Herb., xii, 

 Pt. 0, May 10, 1909, 

 pp. 401, 402, pi. LV. 



Echinocerens baileyi, a uew cac- 



tus from Oklahoma. 



Contr. U. 8. Nat. Herb., xii, 

 Pt. 9, May 10, 1909, 

 p. 403, pis. LVI, LVII. 



■ Nopalea lutea, a new cactus 



from Guatemala. 



Contr. U.S. Nat. Herb., xii, 

 Pt. 9, May 10, 1909, 

 p. 405, pi. LViii. 



Rose, Joseph N. Conzattia, a new 

 genus of Csesalpiniacere. 



Contr. U. 8. Nat. Herb., xit, 

 Pt. 9, May 10. 1909, 



pp. 407, 408, pi. LIX. 



Two new species of Acacia of 



the series Filicinse. 



Contr. U. 8. Nat. Herb., xii, 

 Pt. 9, May 10, 1909, 

 p. 409. 



(See also under N. L. Britton.) 



.Standley, Paul C. The Allionaceae of 

 the United States with notes on 

 Mexican species. 



Contr. U. 8. Nat. Herb., xii, 

 Pt. 8, April 2.3, 1909, 

 pp. i-ix, .30.3-.389, pis. 

 xxviii-XLiii, figs. 49-67. 



GEOLOGY AND MINERALOGY. 



Bassler, Ray S. Cement materials of 



western Virginia. 



Economic Geology, iii, No. 



6, Aug.-Sept., 1908. pp. 



503-524. 



This article is a digest of the 



author's more extensive report 



published in " Mineral Resources 



of Virginia", in 1907. 



The formation of geodes witli 



remarks on the silicification of 



fossils. 



Proc. U. 8. Nat. Mus., 

 XXXV, No. 1637, Nov. 7, 

 1908, pp. 133-154, pis. 



XVIII-XXIV. 



Contains a discussion of geodes 

 in general, followed by a descrip- 

 tion of siliceous geodes occurring 

 in sedimentary rocks. The ma- 

 jority of such geodes are found 

 either at the surface or along 

 zones reached by surface waters, 

 and their origin is ascribed to the 

 infiltration and deposition of silica 

 along the fractures of more or less 

 crushed fossils. Continued dep- 

 osition of silica from the surface 

 waters and the expansive force of 

 the crystals results in a hollow 

 rounded mass or geode, with rem- 

 nants of the fossil sometimes ob- 

 servable on the outside. 



(See also under William F. 



Pate.) 

 Merrill, George P. Notes on Bra- 

 zilian igneous rocks. 



Commissao de Estudos das Minas 

 de Carvao de Pedra do Brazil | — | 

 Relatorio Final I Apresentado a I S. 



Merrill, George P. — Continued. 



Ex. o. Sr. Dr. Lauro Sevoriano Miil- 

 ler I Ministro da Industria, Viacao 

 E Obras Publicas [ por I I. C. 

 White I Chefe da Commissao | — | 

 Traducgao | de | Carlos Moreira | 

 Ex-Secretario da Commissao | — j 

 Rio de Janeiro I Imprensa Nacional I 

 1908. 



Royal 8vo., pp. 221-225. 

 The paper gives a description of 

 a series of rocks collected by Dr. 

 I. C. White and referred to Dr. 

 Merrill for identification. The 

 rocks are classed as diabases, ba- 

 salts, diorites, granites, and ande- 

 sites. 



The composition of stony mete- 

 orites as compared with that of ter- 

 restrial igneous rocks, and consid- 

 ered with reference to their efficacy 

 in world-making. 



Amer. Jour. 8ci., 4th ser., 

 XXVII, No. 162, June, 

 1909, pp. 469-474. 

 The paper gives an average of 99 

 analyses of meteoric stones, com- 

 paring the same with the analyses 

 of terrestrial igneous rocks, and 

 comments on the insuflicipncy of 

 such as world-building materials. 



Pate, William F., and Ray S. Bass- 

 ler. The late Niagaran strata of 



West Tennessee. 



Proc. U. 8. Nat. Mus., 



xxxiv. No. 1621, Aug. 



18, 1908, pp. 407-432. 



In this article, based upon field 



explorations by the U. S. National 



