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 LanpD SHELLS FROM THE PHILIPPINE IsLaNps. By Paul 
Bartsch (Proc. U. S. Nat. Mus., vol. 55, pp. 291-307, pl. 18— 
20, 1919). Six new species and subspecies of Cochlostyla, one 
new Chlorea and a new Leptopoma are described and figured. 
Descrierions OF New SprcIEs oF CHITONS FROM THE PACIFIC 
Coast oF AmMERIcA. 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 Callistochiton, four new 
Mopalia, M. grisea being the type of a new subgenus Semimopalia, 
one new Acanthochiton and two Tonicia. None are figured. 
Tur UnIoNE Fauna OF ALABAMA. By Bryant Walker (20th 
Rept. Mich. Acad. Sci., 1918). An interestingsummary. 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. 
