i^^9-] Geology and PalcEontology. 435 
Davidson's Monograph of Recent Brachiopoda.'— 
During the last hundred years the recent Brachiopoda have 
attracted considerable attention, and a large number of valu- 
able papers have been published upon them, but no satisfactory 
general monograph treating of the shell and animal conjointly 
has appeared. This omission Davidson has supplied. The 
literature of the subject is voluminous and the labor of collating 
and revising alone has been enormous, but the result is a book 
the student will appreciate. The descriptions are characterized 
by a clearness and precision that shows the master. The 
numerous plates drawn by the author are exceptionally fine. 
To Miss Agnes Crane is due the credit of editing this able 
work. Previous to Dr. Davidson's lamented death Miss Crane 
had been studying the Brachiopoda under his guidance, and at 
his request the proof-sheets of this memoir were read by her 
on the author's behalf. 
Barrois' Faune DU Calcaire d'Erbray'— a large 
quarto of 346 pages and 17 plates. After a brief introduction, 
in which the author gives his views of the formation of the 
Calcaire d 'Erbray, follow five chapters devoted respectively 
to the Stratigraphy ; the Description of 200 Species of Inverte- 
brate fossils found in the Calcaire d'Erbray ; Discussion of For- 
mer Works on the Fauna of Erbray ; a Comparison of the Fauna 
of Calcaire d' Erbray, with Equivalent Faunas of Other Re- 
gions; General Considerations on the Fauna of Erbray. In 
conclusion the author remarks: " Les calcaires on plfltot les 
recifs coralliens du Harz, d'Erbray, appartiennent pour nous, 
a I'etage Gedinnien ; ceux de Bretagne et d'Espagne, a I'etage 
Coblenzien ; ceux de Cabrieres a I'etage Eifelien ; ceux des 
Ardennes, aux etage Gevetien et Frasnien. L'identite de 
leurs conditions de formation a pu, a du meme dans certains 
cas, donner aux faunes suscessives de ces calcaires plus d'an- 
alogies entre elles, qu'avec les faunes synchroniques de facies 
Gaudry sur les dimensions gigantesques de quel- 
QUES Mammi feres fossiles' — A short paper in which the 
