Descriptions of New Species and New Varieties 231 



Type Locality. Seattle, Washington. 



Type Material. Twenty-four specimens are in the United States Na- 

 tional Museum bearing Accession no. 214590, one of which is selected as 

 holotype and the remaining specimens become paratypes. Holotype is 

 shown on plate 121 as fig. 20; and one paratype as fig. 19. 



Of the twenty-four specimens in the type lot all but one had a callus, 

 this one being doubtfully referred to cooperi. The original labels of some 

 lots in the National Museum carried identification as oregonensis. Evi- 

 dently this was based upon the presence of a lip callus. However, cras- 

 silabris lacks a peripheral carina and cannot be allied with oregonensis. 

 Other collections have been determined as centervillensis, but the umbili- 

 cus is distinctly different in crassilabris. 



Menetus cooperi crassilabris has been identified in collections from 

 Colma, San Mateo County, California; Oakland, California; Portland, 

 Oregon; Lake Washington at Seattle, Washington; and mountain swamps 

 at Olga, W^ashington. The last named were erroneously identified as 

 Menetus cooperi calioglyptus. One collection from Oakland was associated 

 with typical cooperi. 



Menetus cooperi planospirus, New Variety 



Plate 122, figs. 3-6 



Shell with three whorls, of yellowish horn color. Upper surface flat, the 

 whorl bordered by a raised revolving ridge at the edge. Spire whorls 

 sunken below general level. Base convex. Umbilicus deep, about one-fourth 

 the diameter of the shell. Peripheral ridge stands out and elevated above 

 the shell as a cord. Aperture modified by carina. Sculpture of rather coarse 

 growth lines, crossed by heavy spiral lines. 



Shell Greater Lesser Aperture Aperture 



Height Diameter Diameter Height Diameter 



3.0 3.0 Holotype 



2.6 3.0 Paratype 



2.0 2.0 Paratype 



2.2 2.4 Paratype 



Type Locality. Orcas Island, Puget Sound, Washington. 



Type Material. A collection of thirty-six specimens, taken by W. H. 

 Souther, is deposited in the Museum of Comparative Zoology, Harvard 

 University, Accession no. 31583. One of these, designated as holotype, is 

 shown on plate 122 as fig. 5, and three paratypes are shown on the same 

 plate as figs. 3, 4, and 6. 



Menetus cooperi planospirus is characterized by its very flat spire and 

 the presence of a raised carina placed at the upper edge of the whorl. It 

 differs from Menetus cooperi multilineatus in the position of the carina, 

 and in having a flat rather than a convex spire. 



Menetus dalli. New Species 

 Plate 140, figs. 22-24 



Shell small, lenticular, with a bluntly angular periphery. Upper surface 

 flatly convex, three whorls visible, sutures deeply incised. Lower sur- 

 face flatly convex, the umbilical or spire region small, occupying one-sixth 

 of the diameter of the shell. The lower surface is swollen over the umbili- 



