. The Conchologists' exchange. Mollusks. TH E NAUTILUS. Vnlvat(t rireiis Tryon. Willow Creek, tributary to Susan River, Lassen Co. Anodonta californiensis Lea. Upper waters of Willow Creek. Margaritana margaritifera (L.). Sacramento R. at Redding. IHsidium ultramontanum Prime. Duck Lake, Lassen Co.; W. Fork Feather R. at Morgan Spr., Plumas Co. Another species of Pisiditim occurred in Modoc and Siskiyou counties. A NEW PLIOCENE POLYGYBA FROM FLORIDA. BY CIIAS. W. .JOHNSON. Polygyra caloosaensis, n. sp. Whorls six, slightly depressed, crossed on the body whorl above by about 65 coarse, oblique,
. The Conchologists' exchange. Mollusks. TH E NAUTILUS. Vnlvat(t rireiis Tryon. Willow Creek, tributary to Susan River, Lassen Co. Anodonta californiensis Lea. Upper waters of Willow Creek. Margaritana margaritifera (L.). Sacramento R. at Redding. IHsidium ultramontanum Prime. Duck Lake, Lassen Co.; W. Fork Feather R. at Morgan Spr., Plumas Co. Another species of Pisiditim occurred in Modoc and Siskiyou counties. A NEW PLIOCENE POLYGYBA FROM FLORIDA. BY CIIAS. W. .JOHNSON. Polygyra caloosaensis, n. sp. Whorls six, slightly depressed, crossed on the body whorl above by about 65 coarse, oblique, subarcuate costoe, that end rather ab- ruptly at the periphery; toward the apex they become gradually smaller or obsolete, apical whorl smooth ; below the periphery the costal. become obsolete and the surface has an indented or malleated appearance. Umbili- cus wide, one entire whorl (be- side the body whorl) being visible below. Aperture sublunate, nar- rowed above, lip broad, unevenly reflected, slightly thickened on the base, giving the appearance of an obsolete tooth, callus con- tinuous over the parietal wall and bearing a prominent oblique process, that is subtruncate above, but extends narrowly toward the base. Alt. 6 mm., greatest diam. 11 mm. Two specimens, (one immature) from the material collected by the late Dr. H. G. Griffith from the Pliocene beds of the Caloosahatchie River, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Averell, William D. Philadelphia, Wm. D. Averell
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
