144 THE NAUTILUS. 



pages 57-59, pi. IV). ' In this list 37 species are recorded. From 

 United States of Columbia 11 ; Venezuela 1 ; Ecuador 6 ; Peru 16 ; 

 Bolivia 2; and Porto Rico 1. C. perple.ra Sykes is made a syno- 

 nym of C. dohrni Pfr. C. W. J. 



REPORT ON THE MOLLUSKS COLLECTED BY THE INTERNA- 

 TIONAL BOUNDARY COMMISSION OF THE UNITED STATES AND 

 MEXICO 1892-94, by Wm. H. Ball (Proc. U. S. Nat. Mas., XIX, 

 pages 333-379, pis. XXXI-XXXIII). lu this report the fauna 

 of the region adjacent to the international boundary line that ex- 

 tends from the Rio Grande River near El Paso, Texas, to the Colo- 

 rado River near Yurna, Arizona, is fully treated. Two new species 

 of Polygyra (P. <i*lnnttni and P. pseudodonta) are described from 

 New Mexico. Two new Coelocentrum, a new Anisospira and anew 

 Streptostyla are described from Mexico. C. W. J. 



REVISION OF THE GENERA OF LEDIDJE AND NUCULIUJE OF 

 THE ATLANTIC COAST OF THE UNITED STATES, by A. E. Verrill 

 and Katharine J. Bush (Amer. Jour. Sci., Ill, 1897, pages 51-63). 

 This interesting paper, the authors state, is but a preliminary ac- 

 count of the classification adopted in a .somewhat extended study of 

 the series of deep sea forms belonging to these families. "These 

 families are often united by modern malacologists under a single 

 family ( Nuculidie), while others regard them as distinct. The fam- 

 ily Nuculidre differs from Ledid:e mainly in having no siphon tubes, 

 the mantle edges being completely disunited." A new subfamily 

 (Glominse) of Nuculidaj, and a new subfamily (Tindarinse) of Le- 

 did;r are used, while in the Ledida' four new genera and one sub- 

 genus is adopted. The article is illustrated by 22 cuts, and closes 

 with an analytical table of the recent subfamilies, genera and sub- 

 genera. C. W. J. 



THE EOCENE DEI-OBITS OF THE MIDDLK ATLANTIC SLOI-K IN 

 DELAWARE, M AUYLAND AND VIRGINIA, by Wm. B. Clark (Bull. 

 U. S. Geol. Sur., No. 141). The introduction contains a complete 

 bibliography and an exhaustive account of its stratigraphical and 

 paleontological characteristics, followed by descriptions of species. 

 About 60 species of Mollusca are described and illustrated. The 

 entire work contains 93 pages and 40 plates. 



