476 Reviews—Dr. W. H. Dail’s Tertiary Fauna of Florida. 
simple or granular along the threads. The following are the sections 
of Solarium proposed: (1) Solarium, sensu stricto, Type S. per- 
spectivum, Lamk.; (2) Solariaxis, Type S. elaboratum, Conrad ; 
(3) Patulazis, Type 8S. scrobiculatum, Conrad; and (4) Stellawis, 
Type S. alveatum, Conrad. 
Passing to the genus Calyptrea we may notice that C. trochiformis, 
Lamk., has to give way to the earlier C. aperta, Sol., with which 
it is synonymous. It is noteworthy that a form so characteristic of 
the European Hocene as C. aperta, should be found not only in the 
Lower Tertiary of Claiborne and Vicksburg but ranging up into 
the newer Miocene of the United States. When the Tertiary 
molluscan faunas of both sides of the North Atlantic have been 
rigorously compared—especially the Hocene—we have no doubt that 
many more forms than have hitherto been discovered will be found 
to be common to each continent. 
When we reach Crepidula, Lamk., 1799, we find that the author 
adopts this name instead of Crypta, Humphrey, 1797, which is thus 
anterior, on the ground that the last-mentioned author’s name was 
proposed “in an auction catalogue, without figure, diagnosis, or 
reference to literature,” and we quite agree with this decision ; yet 
in another part of the work we see that the name Ampullinopsis, 
Conrad, 1865, is retained as a section of Ampullina, and Megatylotus, 
Fischer, 1885, is cited in the synonymy, in spite of the circumstance 
that Conrad’s name was never defined, whilst that of Fischer is 
properly established—a fact of which the author appears to be 
perfectly cognizant. He complains that M. Cossmann has omitted 
to state the occurrence of Megatylotus ecrassaéinus, Lamk., in his 
monograph on the Paris basin—we may observe that the French 
author alluded to confined his attention in that work to the 
fossils from the Eocene—the species will be found duly recorded in 
its proper place in his later Oligocene monograph. 
In regard to Dentalium, Dr. Dall remarks that although Stoliczka 
has divided the group into a number of genera and two sub-families, 
he suspects that the differences upon which they are chiefly based, 
such as the supposed forms of the foot in Siphonodentalium and 
Dentalium proper, are less important than might be supposed from 
the few published figures, and require further investigation before 
they can be safely used in systematic work. He therefore retains 
the old nomenclature for the present. As it is impossible to dis- 
criminate, in dealing with fossil species, between those belonging to 
Cadulus and Siphonodentalium, he refers all the forms treated of to 
the former genus, and cites Gadus in the synonymy. 
The work is accompanied by an excellent geological map of 
Florida, by Dr. Dall, which is reproduced, by permission, from 
Bulletin No. 84 of the United States Geological Survey, in which 
our author fully discusses what is known of the geology of the State. 
The importance of this work to students of the mollusca cannot 
-be overrated. It is true that here and there a few blemishes occur, 
as was inevitable in a book of such magnitude. The principal 
fault we have to find is that the author’s title is too restrictive 
