144 THE NAUTILUS. 
pages 57-59, pl. 1V). In this list 37 species are recorded. From 
United States of Columbia 11; Venezuela 1; Ecuador6; Peru 16; 
Bolivia 2; and Porto Rico 1. C. perplexa Sykes is made a syno- 
nym of C. dohrni Pfr—C. W. J. 
Report ON THE Mo.uiusks CoLLectep By THE INTERNA- 
TIONAL BounDARY COMMISSION OF THE UNITED STATES AND 
Mexico 1892-94, by Wm. H. Dall (Proce. U.S. Nat. Mus., XIX, 
pages 333-379, pls. XX XI-XXXIII). In 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 Yuma, Arizona, is fully treated. Two new species 
of Polygyra (P. ashmuni 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 LEDID® AND NUCULID® OF 
THE ATLANTIC Coast OF THE UNITED SrarTEs, by A. E. Verrill 
and Katharine J. Bush (Amer. Jour. Sci., III, 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 (Nuculidz), while others regard them as distinct. The fam- 
ily Nuculidee differs from Ledidze mainly in having no siphon tubes, 
the mantle edges being completely disunited.”. A new subfamily 
(Glomine) of Nuculids, and a new subfamily (Tindarine) of Le- 
didz are used, while in the Ledidz 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. 
Toe Eocene Deposits oF THE MippLE ATLANTIC SLOPE IN 
DELAWARE, MARYLAND AND VireIniA, 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. 
