MOLLUSCA. 
189 
MOLLUSCA 
BY 
Eduard von Martens^ M.D.^ C.M.Z.S. 
By far the greater portion of the publications on this class of 
animals is devoted to descriptions of species belonging to types 
more or less previously known, and more especially of their 
shells, as is usually the case in this department of Zoology. For- 
tunately the number of species described as new, but without 
indication of their habitat, is not very large, so that our know- 
ledge of the geographical distribution of the Mollusks is also 
advanced by most of these papers, especially by those in which 
an enumeration of all the species found in the same district is 
added. The faunas of Eastern Asia and Australia have been 
more particularly enriched in the course of last year. The sys- 
tematic arrangement has not been essentially changed, hut a 
considerable number of new genera (perhaps rather too many) 
have been introduced into science. 
A. The General Subject. 
1. General Works in Progress. 
Keeve, L. Conchologia Iconica, or figures and descriptions of 
the shells of molluscous animals, illustrated chiefly from the 
Cumingian Collection. London, L. Reeve & Co., 4to. 
As far as we know, four double parts have been issued in the 
year 1864, viz. Nos. 236-243, containing the genera Venus, 
Tapes, Meroe,Cytherea(Cytherea in a restricted sense =Meretrix 
of Gray and Deshayes), Circe, Dione, Solarium, Marginella, 
Ancillaria, and Sigaretus. 
The character of this work, which no conchologist can dispense 
with, is so well known, that a description of its object and extent 
is unnecessary. We have been obliged to enumerate as new all 
those species to which no reference is added in the letter-press, 
although we have reason to believe that some of them at least 
have been previously described elsewhere, under the same name. 
Dr. H. G. Bronn’s Klassen und Ordnungen des Thierreich’s, 
wissenschaftlich dargestellt in Wort und Bild. Fortgesetzt 
von W. Keferstein. Leipzig und Heidelberg, 8vo. 
Parts 32-38 of volume hi., containing the Malacozoa, bear the 
date of 1864. They contain the history, development, and classi- 
fication of the Gasteropoda Prosobranchiata (Vorder-Kiemer). 
