84 THE NAUTILUS. 
are new, including 5 from the Pacific Coast. Under Spondylus 
echinatus Martyn, the common recent Spondylus of the West Indies, 
fall no less than 21 synonyms. Plicatula gibbosa Lam., 1801, is 
used instead of P. ramosa Lam., 1819. In the family Limide7 new 
species are described and Lima lima Linn. is adopted for L. squa- 
mosa Lam. Five new species of Anomiide@ are described. For 
Placunanomia rudis Brod. and P. macroschisma Desh. the genus 
Pododesmus Phil. is used. To the Mytilide are added 10 new spe- 
cies. Lithophagus forficatus Ravl. and L. candigerus are synonyms 
of Lithophaga aristata Dillwyn. ; 
Dreissina or Mytilopsis leucopheta Conrad has been placed in the 
genus Congeria. Juliide is adopted in place of Prasinide. Julia 
Gould antedating Prasina Deshayes by one year. The Recent and 
Tertiary Pholadide are thoroughly reviewed and two new species 
described. Zirfea “ Leach, 1817,” Gray, 1847, is adopted instead 
of Zirphea Leach, 1852. But one species of Panopea is recognized 
from the Florida Pliocene. The many generic or subgeneric names 
proposed for various forms of Corbula are either placed in the 
synonymy or used as sections. Ten new species are described. 
In the study of the family Mactride Dr. Dall presents an im- 
mense amount of valuable systematic work on the Mactroid hinge. 
‘““To make these details clear and avoid excessive verbiage, it be- 
comes necessary to name the parts of the hinge, and for clearness I 
prefer to use, for the most part, plain English terms, applied for 
the occasion in a particular and exclusivesense.” These characters 
are clearly shown by ten figures. The classification is that given 
in THe Navutixus, Vol. VIII, pages 25-28, 39-43. Fourteen new 
species are described. The work closes with the family Mesodesma- 
tide in which six new species of Ervilia are described. The volume 
contains 13 plates. 
The Pliocene fauna is so closely allied to the Recent that much of 
Professor Dall’s work bears upon the latter quite as much as on the 
Tertiary, and we shall, therefore, notice the work applying particu- 
larly to recent shells and their evolution separately next month. 
Typographically the volume is a beautiful one, most creditable 
to the Trustees of the Wagner Free Institute and to those engaged 
in its mechanical execution. We take exception to only one fea- 
ture, the date ‘‘ April, 1898” upon title-page and cover. The first 
copies, we believe, were distributed October 29, 1898. 
