158 



2228 Frierson, L. S.: A new pearly freshwater mussel of the 

 genus Hyria from Brazil. U. S. Nat'l Mus. pr 47:3 63, pi 12. 

 Wash. 1914. 



o 



2220 — Dall, William Healey: On some generic names first men- 

 tioned in the "Conchological Illustrations." U. S. Nat'l Mus. 

 pr 48:437-440. Wash. 1915. 



2230 Henderson, John B., and Paul Bartsch: Littoral marine 

 mollusks of Chincoteague Island, Virginia. U. S. Nat'l Mus. 

 pr 47:411-421, pi 13-14. Wash. 1914. 



2231 Macrochasma cremilata 



The Great Keyhole Limpet of the Pacific Coast has received 

 a new generic name at the hands of Dr. Dall (see 6). It is the 

 Fissurella crenulata of Sowerby, better known under the name 

 Lucapina crenulata of later authors. It is the largest and finest 

 of the family, the white shell often four inches long, marked by 

 many radiating ribs and concentric lines of growth; it has a large, 

 oblong hole to one side of the center, around which, internally, is 

 a thick rim of enamel. The crenulated or scalloped edge of the 

 shell is a marked feature, and suggested its name. Internally the 

 shell is of a pure, glossy white, but the outside is somewhat dingy. 

 The animal is much larger than its shell, with a huge yellow foot 

 and a black mantle, which nearly conceals the shell which rests 

 upon its back. Keep says it lives wholly below the tides, and 

 must be gathered by dredging, but at San Diego it is frequently 

 found on the rocks at low tide, or in shallow pools, among the sea- 

 grass with Aplysia californica. Dall speaks of very young speci- 

 mens as of a lurid pink. Occurs from Monterey, California, to 

 Baja California. 



o 



2232 Arnold, Ralph, and Harold Hannibal: The marine tertiary 

 stratigraphy of the north Pacific coast of America. Am Phil 

 soc pr 52:559-605, pi 37-48, 1913. 



2233 Arnold, Ralph: Descriptions of new cretaceous and tertiary 

 fossils from the Santa Cruz mountains, California. U. S. Nat'l 

 Mus pr 34:345-390, pi 31-37. Wash. 1908. 



2234 Arnold, Ralph: New and characteristic species of fossil 

 mollusks from the oil-bearing tertiary formations of Santa 

 Barbara county, California. Smithsonian misc coll 50:419- 

 447, pi 50-58. 1907. 



o 



2235 Hannibal, Harold: See Ralph Arnold. 



2236 Bartch, Paul: See John B. Henderson. 



2237 Hemphill, Henry: 



A collector's notes on variations in shells, with some new vari- 

 ties. Zoe 1:321-337, t 10. 



Edible mollusks of western North America. Zoe 2:134-139. 



Note on Helix yatesii Cooper. Zoe 2:45-47. 



Studies among mollusks — instinct and genera. Zoe 2:312- 

 318. 



Notes on the animals of some west coast shells. Zoe 3:350-2. 



Catalogue land, fresh water and marine shells of California 

 and adjacent states. Leaflet (not seen). 



Catalog of North American shells collected and for sale by. 

 July 1890. 26 p. 



Descriptions of some varieties of shells, with short notes on 



