vill INTRODUCTORY 
of recent Mollusca’ (1853-58). It is greatly to be regretted, that in neither 
of these two publications have the fossil shells been included, because without these 
it is impossible to complete a system. This want ought to have been supplied 
by Chenu’s ‘Manuel de Conchyliologie,’ (Pt. 1, 1859), which is little more 
than a translation of H. and A. Adams’ ‘Genera’, but with the addition of a large 
proportion of the fossil forms, so far as these were known to the author. In the 
numerous and well-executed, though not always very correct, drawings this ‘Manuel’ 
has its own strong recommendation. The system of the ‘Genera’ is, however, 
strictly adhered to, and the genera of fossil shells are simply inserted in the scheme 
of the recent ones, although upon a little more consideration the former would 
have suggested several highly desirable alterations. This reduces the originality 
and partly the value of the book, specially as it has often been left without many 
important observations on families and genera, which are given in the English 
original, 
One of the most valuable contributions to the general knowledge of the Mol- 
lusca will be found in the third volume of Bronn’s ‘Klassenund Ordnungen 
des Thier-reiches’ (1858-63), forming a copious compendium of nearly all 
existing information regarding that division or sub-kingdom of animals. The 
anatomy of the animals, the formation of the shells, the systematic, geographical, 
and geological distribution are treated of more extensively, than can be found in 
any other similar Manual. It is only to be regretted, that it has not been the good 
fortune of the originator of that grand publication to complete it. The systematic 
arrangement of the Mollusca is in many respects an original and improved one, 
while in others it presents an apt and careful selection from what was already known. 
Bronn’s chief divisions of the Mauacozoa are ACEPHALOMALACIA and 
CEPHALOMALACIA. The latter contain the CrrHaLopopA, GASTROPODA, and 
ScapHoropa. The first of these, which is considered the highest in organization, 
has been already treated of in our previous publication of the South-Indian 
eretaceous fauna.* 
The ScAPHOPODA, PROSOPOCEPHALA, or CIRROBRANCHIA, include the single 
family Deyrazirp2#, while all the rest of the headed Mollusea are treated by Bronn 
in the class GastropopA, which is divided into the following orders: PrERopopa, 
Cuvier; OpistHoBRANCHIA, M. Edwards; HrrEropopa, Lamarck; PROsOBRANCHIA 
M. Edwards; Putmonata, Cuvier. The ProsoBrancuiA, which include the 
majority of known shells, are further divided into Curroyzp#, CYCLOBRANCHIA, 
* Paleontologia Indica, Ser. I and III. 
