THE NAUTILUS. 143 



MORPHOLOGICAL FEATURES OF CERTAIN MUSSEL SHELLS FOUND 

 IN LAKE ERIE COMPARED WITH THOSE OF THE CORRESPONDING 

 SPECIES FOUND IN THE DRAINAGE OF THE UPPER OHIO. By 

 Norman McDowell Grier. (Ann. Carnegie Museum, Vol. 13, 

 pp. 145-182, 1920.) 



MARINE MOLLUSKS OF HAWAII. By Henry A. Pilsbry. 

 (Proc. Acad. Nat. Sci., Phila., 1920, pp. 296-328, pi. 12. with 

 11 figs, in text.) Forty-five new species and subspecies are 

 described, with keys to the described species of Hawaiian 

 Terebra and Mitra. C. W. J. 



THE WEST AMERICAN MOLLUSKS OF THE FAMILIES RISSOEL- 

 LIDAE AND SYNCERATIDAE AND THE RlSSOID GENUS BARLEEIA. 

 By Paul Bartsch. (Proc. U. S. Nat. Mus., 1920, Vol. 38, pp. 

 159-176, pis. 12, 13.) 



NEW FRESH WATER SHELLS FROM GUATEMALA. By William 

 B. Marshall. (Proc. U. S. Nat. Mus., 1920, Vol. 58, pp. 301- 

 302, pi. 17.) 



THREE NEW SPECIES OF PLEUROCERIDAE. By Calvin Good- 

 rich. (Occas. papers Mus. Zool., Univ. Mich., No. 91, pp. 

 1-5, pi. 1, 1921.) 



NEW FLORIDIAN SUBSPECIES OF THE GENUS LIGUUS. By 

 Charles T. Simpson. (Proc. Biol. Soc., Washington, 1920, 

 Vol. 33, pp. 121-126.) Eighteen new subspecies are described. 



SUMMARY OF THE MARINE, SHELL-BEARING MOLLUSKS OF THE 

 NORTHWEST COAST OF AMERICA, from San Diego, California, to 

 the Polar Sea, mostly contained in the collection of the United 

 States National Museum, with illustrations of hitherto unfigured 

 species. By William Healey Dall, U. S. Nat. Mus. Bull. 112, 

 1921, 217 pages, 22 plates. "To the preparation of this sum- 

 mary the author has brought the results of more than 50 years' 

 study of the molluscan fauna of the northwest coast." Its ap- 

 pearance has long been looked forward to by West Coast con- 



