= we 
1886. | Recent Literature. 363 
including the trilobites and Merostomata. The illustrations are 
abundant and in most every case well engraved. The pages given 
to the Merostomata, the Phyllocarida and the lower Macrura are 
full and fresh in treatment. ach order is defined; a brief gen- 
eral account of the external anatomy follows, with remarks on the 
opinions of different authors as to their classification. The fami- 
ies and genera are defined, the leading types are figured, and then 
follow tables showing the geological distribution of the species. 
The author is usually critical in his mode of treatment, as seen in 
his doubtful recognition of Brachypyge as a Carboniferous crab, 
which, since the publication of this part, has been shown to be a 
pedipalp arachnidan. We do not see why, even in the light of 
Meek and Worthen’s excellent treatment, Anthrapalaemon should 
be placed in the Penæidæ. Still the author’s thoroughness and 
command of the literature is evident throughout the work. 
Faxon’s REVISION OF THE CRAWFISH!—This is a systematic 
treatise on the crawfish of the Northern hemisphere, based chiefly 
on the material in the museum at Cambridge, which now pos- 
Sesses all the known species from Europe and Asia, and all the 
American species, with three exceptions. The richness of the 
material may be realized by the fact that twenty new species of 
Cambarus are described, whereas Dr. Hagen, in his well-known 
memoir on the North American crawfish, described but ten un- 
known to previous authors, | 
The treatment of the material by the author, as may have been 
€xpected, is thorough, and the illustrations, drawn by Mr. Paul 
Roetter, are excellent. It is a matter of great interest to be able 
to study such a group as this, scattered as it is through the 
northern portions of the New and Old World. Itis to be hoped 
that Our naturalists will endeavor hereafter, in making out our 
American fauna, to compare it with that of Europe and particu- 
larly Eastern Asia, 
, GRABER’S Anrmat Mecuanics.—This forms a double volume 
in a German series, entitled, Das Wissen der Gegenwart, devoted 
to popular knowledge relating to science, history and literature; 
each volume costing but a single mark or twenty-five cents. 
te present volume is devoted to the mechanics of the ex- 
-rnal organs of vertebrates and invertebrates. The author 
is well known as an authority on the mechanics of motion, 
a of the Arthropoda and has given us what we have found 
ordinary corm works on natural history. It is abundantly — 2 
> y 
Memoirs of the Mus ; ision of the E 
- useum of Comparative Zoölogy, x, No.4. A revision of the — 
—— - By WALTER Faxon. Part 1 e sis Cambarus and Astacus. With — 
Cambridge, August, 1885. 4to, pp. 186. 
