. 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 ... ^ other localitiesin California, also from Utah and adjacent costdta, Miill, the Ribbed Vallonia, isanother very small species, the shell being in diameter. Horn-colored, nearly flat,umbilicated, with regularly set membranous ribs,and fine striae between them. It has aoout the samerange as the last species. AIR-BREATHERS 141. hyporhyssa. Fig. 117, X :}
. 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 ... ^ other localitiesin California, also from Utah and adjacent costdta, Miill, the Ribbed Vallonia, isanother very small species, the shell being in diameter. Horn-colored, nearly flat,umbilicated, with regularly set membranous ribs,and fine striae between them. It has aoout the samerange as the last species. AIR-BREATHERS 141. hyporhyssa. Fig. 117, X :} (*) 17 millimeters. AslimunellaCklL, the Less - WrinkledSnail, occurs abundantly atCloudcroft in James Can-yon, Otero Co., New form lacks tlie parietaltooth. Aslimunella a s h m, u n i,Dall, Ashmuns Snail. Threemuch enlarged views ofthe pretty little shell aregiven in Figure 118. Thediameter is 14mm. The horn-colored whorls are crossedby very many fine, incisedlines. From Bland, NewMexico, at an elevation of8,000 feet above the level ofthe sea. Aslimunella pseudodSnta, Asliuiunella rhyssa, Dall, theWrinkled Snail, is shown in Fig-ure 117. The shell consists of sixrounded, yellowish whorls, whichare crossed by very numerouswrinkles. The reflected peristomeis white, and immediately behindit the shell is considerably con-stricted. It was collected in theWhite Mountains of New Mexicoby Rev. E. H. Ashmun. Diameter
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
