. The Conchologists' exchange. Mollusks. 136 THE NAUTILUS. In addition to the above the following species were collected by- Mr. Geo. H. Clapp; these complete to the present date all the species found in Allegheny County, Pennsylvania. Strobila labyrinthica Say. Mesodon clausa Say. Mesomphix lievigatus Pfr. Gastrodonta suppressa Say. Vitrina limpida Gld. Vertigo bollesiana Mse. Pupa corticaria Say. A NEW PAPUINA. BY CHARLES HEDLEY, SYDNEY, Papuina cerea Hedley. Shell thin, translucent; contour trochoidal, color waxen white, becoming yellowish on the 3rd and 4th whorls, encircled be
. The Conchologists' exchange. Mollusks. 136 THE NAUTILUS. In addition to the above the following species were collected by- Mr. Geo. H. Clapp; these complete to the present date all the species found in Allegheny County, Pennsylvania. Strobila labyrinthica Say. Mesodon clausa Say. Mesomphix lievigatus Pfr. Gastrodonta suppressa Say. Vitrina limpida Gld. Vertigo bollesiana Mse. Pupa corticaria Say. A NEW PAPUINA. BY CHARLES HEDLEY, SYDNEY, Papuina cerea Hedley. Shell thin, translucent; contour trochoidal, color waxen white, becoming yellowish on the 3rd and 4th whorls, encircled below the suture by an opaque white thread, nowhere are translucent lines or spaces visible. Sculpture: surface of a waxen polish; transverse growth lines can be detected by the unaided eye, and spiral grooves, almost effaced above but plainer on the base, may be deciphered with a lens. Whorls 5^, flattened, regularly increasing, the last constituting five-eighths of the shell's height, angled at the periphery, descending considerably and abruptly at the aperture, gibbous at the point of flexure. Suture impressed. Aperture very oblique, anterior margin waved ; columella oblique, wide, extending nearly to the angle of the aperture, subtruncate below. A thin, trans- lucent, shining callus extends over the imperforate axis to the inser- tion of the anterior margin of the lip. Height 132, major, diam. 16, min. diam. 14 mm. Hab. Bloomfield River, North Queensland. ON THE SPECIES OF MACTRA FROM CALIFORNIA. BY WM. H. DALL. In revising the Tertiary Maciracea of the southeastern United States, it became necessary to examine the recent species and work. 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
