. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... 140 WEST AMERICAN SHELLS. teeth; diameter 18mm.; from Arizona and NewMexico. Polygyra 7ne-drnsii, Dall,M e a r n s sSnail, isshown in Fig-ure 116. Thisshell is of a tig. ii6, x ^ (*) pinkish brown color. The details of the shell arewell brought out in the three figures. Diameter,13mm. Found in Arizona and in Hachita GrandMountain, New Mexico. Vallonia pulchella, MiilL, the Beauti
. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... 140 WEST AMERICAN SHELLS. teeth; diameter 18mm.; from Arizona and NewMexico. Polygyra 7ne-drnsii, Dall,M e a r n s sSnail, isshown in Fig-ure 116. Thisshell is of a tig. ii6, x ^ (*) pinkish brown color. The details of the shell arewell brought out in the three figures. Diameter,13mm. Found in Arizona and in Hachita GrandMountain, New Mexico. Vallonia pulchella, MiilL, the Beautiful Vallonia,is a little mollusk whose shell consists of fourrounded whorls arranged in a flattened spiralform. The umbilicus is large and open, the aper-ture nearly circular, the peristome white, reflected,and forming a nearly complete circle. The shell iswhitish, thin, and in our variety is usuallymarked by cross-ribs. Its diameter is barely aneighth of an inch. The species is very widely dis-tributed. A few years ago it suddenly appeared inLos Angeles, in the yard of Dr. Stearns. It is alsoreported from Oakland and man}^ other localitiesin California, also from Utah and adjacent costdta, Miill, the Ribbed Vallonia, i
Size: 2435px × 1026px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
