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 Limidce 7 new 

 species are described and Lima lima Linn, is adopted for L. squa- 

 mosa Lam. Five new species of Anomiidce are described. For 

 Placunanomia rudis Brod. and P. macro schisma Desh. the genus 

 Pododesmus Phil, is used. To the Mytilidce are added 10 new spe- 

 cies. Lithophagus forficatus Ravi, and L. candigerus are synonyms 

 of Lithophaga aristata Dillwyn. 



Dreissina or Mytilopsis leucophceta Conrad has been placed in the 

 genus Congeria. Jul'ddce is adopted in place of Prasinidce. Julia 

 Gould antedating Prasina Deshayes by one year. The Recent and 

 Tertiary Pholadidce are thoroughly reviewed and two new species 

 described. Zirfcea "Leach, 1817," Gray, 1847, is adopted instead 

 of Zirphcea Leach, 1852. But one species of Panopea is recognized 

 from the Florida Pliocene. The many generic orsubgeneric 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 Mactridce 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 ex elusive sense." These characters 

 are clearly shown by ten figures. The classification is that given 

 in THE NAUTILUS, Vol. VIII, pages 25-28, 39-43. Fourteen new 

 species are described. The work closes with the family Mesodesma- 

 tidce 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. 



