. 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 ... Fig. 52 68 WEST AMERICAN SHELLS. trie, rounded ridges, some of which divide intotwo. Pitdria newcomhidna,Gabb, Newcombs Pit-aria, Figure 53, hasbeen found in moderate-ly deep water fromMonterey southward. Itis thin and delicate, withzigzag, brown markings,and a papery epidermis. ^^- ^^ * ^** Figure 54 gives a boldpicture of Cytherea for-di, Yates, Fords Cythe-rea, which is found
. 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 ... Fig. 52 68 WEST AMERICAN SHELLS. trie, rounded ridges, some of which divide intotwo. Pitdria newcomhidna,Gabb, Newcombs Pit-aria, Figure 53, hasbeen found in moderate-ly deep water fromMonterey southward. Itis thin and delicate, withzigzag, brown markings,and a papery epidermis. ^^- ^^ * ^** Figure 54 gives a boldpicture of Cytherea for-di, Yates, Fords Cythe-rea, which is found fromthe Santa Barbara Is. toPanama. It is verythick and heavy, and hasa very deep lunule. Itreaches a length of twoand a half inches. Thisis the shell which passedfor years as Venus toreuma, Gld., but that is foundto be a distinct Polynesian species. The Saxidomes of this coast have recently beenrevised by Dr. Dall, and the numerous namesreduced to two. The first is 8axidomus nuttdllii,Conr., Nuttalls Saxidome, shown in Figure includes the old Saxidomus aratus, Gld. Theshells are usually marked by rough concentricridges, as shown in the figure. Wlien young, thereare brownish markings near the beaks, with a
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
