. West coast shells. A familiar description of the marine, fresh water, and land mollusks of United States, found west of the Rocky Mountains ... ecomes somewhat triangular and the latter part is prolonged. There is no distinct lunule as in the other species;the ribs and lines are rounded, and the edges aremarked with fine crenulations. Externally the shellis dingy, but it is pure white within, with purplespots at or near the muscle scars. The shell is aninch or two in length; southern. Fig. 160 represents one of the most graceful of ourbivalve shells. Its name is Amiantis callosa, Conr.,Am-i-
. West coast shells. A familiar description of the marine, fresh water, and land mollusks of United States, found west of the Rocky Mountains ... ecomes somewhat triangular and the latter part is prolonged. There is no distinct lunule as in the other species;the ribs and lines are rounded, and the edges aremarked with fine crenulations. Externally the shellis dingy, but it is pure white within, with purplespots at or near the muscle scars. The shell is aninch or two in length; southern. Fig. 160 represents one of the most graceful of ourbivalve shells. Its name is Amiantis callosa, Conr.,Am-i-an-tis cal-lo-sa. It is a pure white shell, fullin the center and quite thin at the edges. Its sculp-turing consists of many rounded, concentric lines,equal in size to the intervening grooves. There areno radial markings whatever. The lunule is small,set beneath the prominent umbones. The ligament is external, the pallial sinus moder-ate, while the hinge has complicated cardinal teeth i88 AMIANTIS. and strong lateral ones. The common length of theshell is two or three inches, but sometimes it is muchmore. It is found on the southern Fig. 160. Standella nasnta, Conr., na-su-ta. Very similarto the next species, of which it is perhaps only a vari-ety; shell somewhat depressed behind the inch or more in length. Standella plannlata, Conr., plan-u-la-ta, is shownin Fig. 161. Its shape is much likethat of the last, but it isonly half as long. Thebeaks are nearly equidis-tant from the ends of theshell, and the triangularhinge-tooth is in front offound in southern
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
