36 THE NAUTILUS. 



by W. G. Binney, Prime and Tryon, issued by the Smithsonian 

 Institution, 1865-73, and the works of Lea on Unionidae, of 

 about the same date. Some single groups have been elaborately 

 treated since, the Uniones by Simpson, the Lymnaeidae by 

 Baker; but most of the progress in the last fifty years has been 

 recorded in a host of papers, by many authors and in many 

 journals. To systematize this material and make it readily ac- 

 cessible, Dr. Walker has prepared this synopsis of the classifica- 

 tion as understood today, giving definitions of the families, 

 genera and minor groups, with figures of types or typical species 

 of each, frequently also of anatomical structures important in 

 classification. 



The second paper is devoted to species published since the 

 appearance of the monographic works alluded to above, together 

 with those omitted, formerly misunderstood, or concerning 

 which there has been diversity of opinion. The great utility of 

 such a catalogue will be apparent. 



Together, these papers give a most interesting epitome of the 

 progress made by the present generation in the study of our 

 fresh- water mollusks, so far as classification and description are 

 concerned. Dr. Walker's long familiarity with the subject 

 enables him to present it lucidly and completely. H. A. P. 



NEW LAND SHELLS FROM THE PHILIPPINE ISLANDS. By Paul 

 Bartsch (Proc. U. S. Nat. Mus., vol. 55, pp. 291-307, pi. 18- 

 20, 1919). Six new species and subspecies of Cochlostyla, one 

 new Cklorea and a new Leptopoma are described and figured. 



DESCRIPTIONS OF NEW SPECIES OF CHITONS FROM THE PACIFIC 

 COAST OF AMERICA. By William H. Dall (Proc. U. S. Nat. 

 Museum, vol. 55, pp. 499-516, 1919). Five new species of the 

 genus Lepidopleurus ; two new Nuttallina, fourteen new Ischno- 

 chiton, one new Chaetopleura, seven new Gallistochiton, four new 

 Mopalia, M, grisea being the type of a new subgenus Semimopalia, 

 one new Acanthochiton and two Tonicia. None are figured. 



THE UNIONE FAUNA OF ALABAMA. By Bryant Walker (20th 

 Kept. Mich. Acad. Sci., 1918). An interesting summary. The 

 State has the largest Unione fauna of any area of similar size in 

 the world. Three faunas are represented known as the Tennes- 

 see, Alabama and Atlantic faunas. Of the 533 species of 

 Unionidae belonging to North America, more than 300 are 

 found in Alabama. C. W. J. 



