Recent Literature. 
RECENT LITERATURE. 
Haecki-l's Report on the Siphonophor/E collected 
BY H. M. S. Challenger during the vears 1 873-1 876.— This 
report forms Part Ixxvii. of the zoological series of reports, 
and consists of 383 pages and fifty lithographic and chromo- 
hthographic plates. The author's long-continued and elab- 
orate investigations of living Siphonophorse and medusae in 
the Mediterranean, Atlantic and Indian Oceans have enabled 
him to make it a generic monograph of the class. He distin- 
guishes seventy-five genera, all clearly defined and described 
at length, containing 245 species. The plates are exquisite ; 
remarkable both for beauty and elaborate finish of detail. 
The following synopsis shows the distribution of the 
ic Nectiliidai 
VelellidK 
Order IL 
Eudoxiidx 
ErsiEidae... 
C..vco». 
.^^^. Anthophyrida' 
8 28 Order IV. Auko 
Desmophyida. . 
\ 'I ORDER V. CVS. O 
. Phyrone 
Order III 
CTF Rh-zo h ridi; 
Anthonidc-e.. 2 ^ K ^bulida^ 
White's Review of the Fossil Ostreid/e of North 
America,^ and a Comparison of the Fossil Forms with the 
Living Forms.— This is a compilation of material already 
fxiblished, arranged to show the geological history of the 
oyster family, addressed rather to the general reader than to 
the special student. The author recognizes three genera, 
and a sub-genus among fossil forms, but groups all the living 
species under one genus— Ostrea proper. Mr. Ryder contrib- 
^ A Review of the Fossil Ostrdds of North America, and a Comparison of the 
Fossil with the Living Forms. By Charles A. White, M.D. With Appendices 
by Prof. Angelo Heilprin and Mr. lohn A. Ryder. Extract from the Fourth Annual 
Report U. S. Geol. Survey. 
