3804 PROGRESS OF MICROSCOPICAL SCIENCE. 
mulinide (Archediscus, Amphistegina, and Nummulina), m the Car- 
boniferous limestones, are some of the most important points in this 
excellent Monograph; and its value is greatly enhanced by eight 
elaborate Tables, special and general, showing in great detail the 
geological and geographical distribution of the fifty-eight species, 
according to their localities and stratal horizons in the many districts 
whence they were obtained. A perfect index for genera and species 
and their synonyms completes the volume.” 
British Fossil Bivalved Entomostraca of Post-Tertiary and Car- 
boniferous Dates.—These have been thoroughly worked out and figured 
in sixteen plates in the ‘ Monographs of British Fossils, * by Dr. G. 8. 
Brady and Messrs. H. W. Crosskey and Dr. Robertson. Of it the 
‘ Geological Magazine’ (May) says:—‘ The classification of the 
Ostracoda (the special group of Bivalved Entomostraca treated of in 
this Monograph), according to the shape, texture, markings, and hinge- 
ment of the valves, and the synopsis of their genera, based upon the 
anatomical characters of the animal, will be highly acceptable to the 
students both of recent and of fossil specimens ; and indeed these 
admirable synopses are full of the latest information, derived from 
the researches chiefly of Dr. G. O. Sars, of Norway, and Dr. Brady 
himself. ‘Of the 182 species of Ostracoda described in this Mono- 
graph, 24 may be considered to have been inhabitants of fresh or 
slightly brackish water, the remaining 108 being strictly marine 
species. All except Limnicythere antiqua are known in the living 
state. Of the marine forms found in the Post-Tertiary beds there are 
lists given,—1. Of those now known as characterizing the Arctic seas 
and the northern coasts of Norway, Scotland, and America. 2. Those 
now extinct, or unknown in the living state. 3. Those found in the 
Glacial and Post-Glacial deposits of Norway. 4. Those found in 
the Glacial (and Post-Glacial ?) deposits of Canada.” 
The Carboniferous Entomostraca have been handled by Professor 
Rupert Jones, J. W. Kirkby, and G. 8. Brady, in the same volume, 
and their observations extend only to “the Cypridinade and their 
Allies.” “Some parts of the Mountain Limestones of various countries 
seem to abound in subglobular bivalve carapaces, and their loose 
valves, which approximate in character to various members of the 
Cypridinad group; some are also found in the Coal-measures; and 
others in the older Devonian, and even in the Silurian rocks. They 
are associated frequently with other Ostracodous valves, such as 
Beyrichia, Leperditia, Cytheride, and Cypride of various alliances. 
In this part of the Monograph we find 183 Cypridine (directly related 
to the existing Cypridina); 7 Cypridinelle, 9 Cypridellinee, 6 Cypri- 
delle, and 2 Sulcune, which are genera arranged artificially to 
receive several forms of carapace varying by gradational differences 
from the valves of the known Cypridina ; 2 Cyprelle ; 1 Bradycinetus ; 
1 Philomedes ; and 2 Rhombine, of which much the same may be said 
as of the foregoing ; also 4 Entomoconchi, 1 Offa, and 3 Polycopes. 
The definition of the true Cypridine,—the true allocation of the 
* Published by the Paleeontographical Society, vol. xxviii. 
