. Fresh-water biology. Freshwater biology. I004 FRESH-WATER BIOLOGY 129 (130) Shell large, solid, inflated, subrotund; beak sculpture weak, not continuous with the surface sculpture, which consists of oblique folds; hinge strong and complete. Arkansia Ortmann and Walker. The type and only species known, A. whederi 0. and W. (Fig. 1499; X a), has recently been discovered in the Oid River, Arkadelphia, Fig. i49y. 130 (134) Shell elliptic-rhomboid, compressed; pseudocardinals well developed; laterals more or less imperfect or subobsolete. Symphynota Lea . 131 131 (132, 133) Shell smooth, sh
. Fresh-water biology. Freshwater biology. I004 FRESH-WATER BIOLOGY 129 (130) Shell large, solid, inflated, subrotund; beak sculpture weak, not continuous with the surface sculpture, which consists of oblique folds; hinge strong and complete. Arkansia Ortmann and Walker. The type and only species known, A. whederi 0. and W. (Fig. 1499; X a), has recently been discovered in the Oid River, Arkadelphia, Fig. i49y. 130 (134) Shell elliptic-rhomboid, compressed; pseudocardinals well developed; laterals more or less imperfect or subobsolete. Symphynota Lea . 131 131 (132, 133) Shell smooth, shining, rayed; teeth delicate; laterals moderately developed. Subgenus Symphynota The type, ;'om/'rf55aLea(Fig. 1500; X rl), is one of the common species of the Northern State-S, ranging from New York west to Nebraska and south to Arkansas. Several other species are found in the Atlantic drainage from New \ork to South CaroUna and in eastern Tennessee and northern 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
Size: 1727px × 1446px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
