346 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 11, NO. 14 



The subject matter is divided into two parts which are intended to meet 

 the needs of such readers. The first part treats the theoretical side in a 

 way that is as simple as it can be made; the second part takes up the con- 

 sideration of the practical construction of some of the most important pro- 

 jections, the intention of the authors being to give such detailed directions 

 as are necessary to present the matter in a clear and simple manner. 



The use of mathematical analysis in the first part is studiously avoided 

 since the intention is merely to illustrate the way in which different kinds 

 of projection may arise when we attempt to produce maps with specific 

 properties. Both the first and second part are profusely illustrated with 

 figures that serve to make clear the statements of the text. 



The projections described in the second part belong mainly either to the 

 conformal class or to the equal-area class. Several tables for projections 

 are included, the most important being that of a Lambert-zenithal equal- 

 area projection for the United States or for North America with center on the 

 parallel of 40°, that of an Albers equal-area projection for the United States, 

 and finally, the most important of all, that of a general Mercator projection. 

 As a closing section of part two and of the whole treatise, some general con- 

 sideration is given to world maps, that is, to maps that are intended to in- 

 clude as great an extent of territory as a hemisphere or in certain cases to 

 represent the whole sphere. C. H. D. and O. S. A. 



PETROLOGY. — halite: a new leucite rock. Henry vS. Washington. Amer. 

 Journ. Sci. 50: 33^7. 1920. Atti. Accad. Lincei 29: 424-435. 1920. 

 A detailed account of the new leucite rock first described in this Journal 

 10: 270-272. 1920. 



ZOOLOGY. — Report on the ophiurans collected by the Barbados-Antigua 

 Expedition from the University of Iowa in iqi8. Austin H. Clark. 

 Univ. Iowa Studies. Studies in Natural History, 9 (First Series No. 45), 

 No. 5, 29-63. March 15, 1921. 

 A history of the study of the ophiurans of the Caribbean region is given, 

 with a list of the more important papers ; the Caribbean echinoderm fauna is 

 discussed, and the peculiarities of the West Indian ophiuran fauna are ana- 

 lyzed and compared with those of the crinoid fauna of the same region; 

 the discontinuous distribution of the echinoderms is discussed and explained 

 as resulting from the extirpation of ancient types from the more favorable 

 areas in the sea so that they now exist only in isolated localities representing 

 the extreme limits of their original habitat; a complete list of the West 

 Indian ophiurans is given; the occurrence of these animals at Barbados and 

 at Antigua is described, and all previous records from these islands are given; 

 the specimens secured by the expedition are described in detail. A. H. C. 



ENTOMOLOGY.— r/ie ants of the Fiji Islands. W. M. Mann. BuU. Mus. 

 Comp. Zool. Harvard 64: 401-499, figs. 1-38. No. 5, 1921. 

 This is a report of the ants collected by the writer while in Fiji as Sheldon 

 Traveling Fellow of Harvard. The insects of Fiji are not well known ; hither- 

 to but 53 species of the order Hymenoptera had been recorded from the 

 islands. The present paper lists 78 species of ants, including many new species 

 and several new genera and subgenera. Certain genera of ants are well 

 developed in Fiji, among them the genus Camponotus, which is represented 

 by ten forms belonging to a subgenus {Myrmegonia) which is confined to 



