s 
200 SHELLS OF SAN PEDRO BAY—WILLIAMSON. 
Genus NORRISIA Bayle. 
Norrisia Norrisii Shy. (7rochiscus Norrisii, of authors). 
Plentiful on kelp at Dead Mawn’s Island. “The name Trochiscus is pre- 
occupied.” (W. H. D.) 
Genus CHLOROSTOMA Swainson. 
Chlorostoma aureotinctum F bs. 
Most plentiful at White’s Point. 
Chlorostoma brunneum Phil. Pl. xx1, fig. 8. 
Very few, none large. 
Chlorostoma funebrale A. Ad. Pl. xxI, fig. 7. 
A few at the Points. 
Chlorostoma funebrale var. subapertum Cpr. PI. xx1, fig. 6. 
U.S. National Museum, No, 123496. This unfigured variety is here 
illustrated for comparison. (W. H. D.) 
Chlorostoma gallina Fbs. 
Our most abundant species. Some vary from the type by the ab- 
sence of the numerous spots or speckles. 
Chlorostoma gallina var. pyriformis Cpr. 
A half dozen of this variety have been found. One very tine exam- 
ple on Rattlesnake Island, by Mrs. Charles Burton Woodhead. (J.G.C.) 
Chlorostoma gallina var. tincta Hmp. 
One shell found at Portuguese Bend. This variety has rounded 
whorls and is not speckled. 
Chlorostoma Montereyensis Kien. (C, Pfeifferi Phil. of Cal. lists). 
Rare; dead. 
Section OMPHALIUS Phil. 
Chlorostoma (Omphalius) viridulum var. ligulatum Mke. (Omphalius fuscescens. 
Phil. of California authors). 
Not rare; sometimes inhabited by crabs. 
Chlorostoma (Omphalius) globulus Cpr. 
One shell (©. T.S.). This form was described by Carpenter from 
Mazatlan (Maz. Cat., 235), but is not mentioned by Mr. Pilsbry in his 
monograph of the group. (W. H. D.) 
