Zoology. 139 
by a plate. The first presents new facts bearing on his view as to 
the reappearance of types; and the second describes several new 
Trilobites, Pteropods, Bracbiopods and Cystidea from the Silu- 
rian beds of Hof, besides a comparison of the Silurian beds of 
Hof with those of Bohemia. 
IilI, ZOOLOGY. 
1. On some of the more recent works upon Annulata.—Since the 
appearance of the Familien der Anneliden of Grube in 1856 no 
opment and systematic zoology of the class. The plates are en- 
usually find in general text books in most departments of natur 
history. We can fairly take it as an excellent guide for the deter- 
mination of Annulata, and it will take its place by the side of the 
capital works of Milne Edwards on Crustacea and Polyps, pub- 
lished in the same series. It is however somewhat unfortunate that 
many species hitherto unknown should have been described by 
Quatrefages from alcoholic specimens, when the careful study even 
of the living specimens of this class is subject to so many diff- 
culties and likely to encumber us with additional synonyms for 
* Dr. E. Ehlers, Die Borstenwiirmer, Pt. I, 1864, Pt. I, 1868 ae 
t A. de Quatrefages, Histoire Naturelle des Annelés, 1865. pe 
