54 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
two subacute teeth, the upper largest; a thin callus expanded over the 
inner wall, and crossing half the width of the aperture; intervals between 
the teeth and walls equal. Long., 0.32; lat., 0.22 unc. (equals long., 8; 
lat., 5 mm.). (Cooper.) 
Type in California Academy of Sciences. Type locality, San Pedro, 
California. 
Range. San Pedro, California, to Gulf of California. 
Pedipes liratus Binney, 1860 
Plate 2, fig. 14 
Proceedings, Philadelphia Academy of Natural Sciences, 154. Proceedings of the 
United States National Museum, 8; PI. 18, fig. 5. 
Shell imperforate, globose-conic, solid, shining, straw-colored, regularly 
marked with revolving ridges; spire short, depressed, apex obtuse; whorls 
three, the upper ones short, the lower one about equalling five-sixths the 
length of the shell; aperture semicircular, its parietal wall covered with 
shining callus, and furnished with a thick, elevated, hooked and entering 
fold; columella furnished with two, thick, acute, tooth-like processes, 
placed side by side; peristome acute, furnished on its interior with a 
shining callus, which is protracted into a high tubercle at its middle. 
Length, 2> l /z ; diameter, 2^4 ; length of aperture 2j4 mm. (G. W. Binney.) 
Type in Philadelphia Academy of Sciences. Type locality, Cape San 
Lucas, Lower California. 
Range. San Diego, California, to Gulf of California. 
Genus MELAMPUS Montfort, 1810 
Shell oval-conoidal, or suboval, solid; spire rather short; aperture 
elongated, narrow; columellar lip with several dentiform plications; 
columella plicate; outer lip sharp, interior with revolving ridges. 
Type. M . luteus Quoy. 
Distribution. Universal, mostly tropical, salt-marsh shells. Fossil: 
Miocene of Touraine; Pleistocene—San Pedro, San Diego. Pliocene, 
San Diego well. 
Melampus olivaceus Carpenter, 1856 
Plate 1, fig. 16 
Catalogue of the Collection of Mazatlan Shells, 178. Proceedings of the United States 
National Museum, 8; PI. 18, fig. 16. 
Shell with green epidermis, with the irregular purplish brown tessel¬ 
lated patches often showing through; the sharp purplish outer lip, well- 
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