. The Conchologists' exchange. Mollusks. Eadula: Formula (190-1-190) ; central 95 95 1 95 95 tooth more or less quadrate, the lower outer corners being very much attenuated ; cusp 9-dentate, 5 denticles being long and narrow, and two on each side smaller and more blunt; laterals in two alternate ser- ies, the primary teeth large, obliquely inclined, comb-like ; the cusps are very peculiar, and vary to a large degree ; some teeth have five long, pointed cusps with six small ones, one between each large one and one at each end (Fig. 5) ; others have but two small denticles, while still others ha
. The Conchologists' exchange. Mollusks. Eadula: Formula (190-1-190) ; central 95 95 1 95 95 tooth more or less quadrate, the lower outer corners being very much attenuated ; cusp 9-dentate, 5 denticles being long and narrow, and two on each side smaller and more blunt; laterals in two alternate ser- ies, the primary teeth large, obliquely inclined, comb-like ; the cusps are very peculiar, and vary to a large degree ; some teeth have five long, pointed cusps with six small ones, one between each large one and one at each end (Fig. 5) ; others have but two small denticles, while still others have one or more between (Figs. 5, 2, 3, 4). The secondary teeth are long and narrow, with a wide, blunt cusp. These latter, as also the central tooth and small teeth between the cusps of the primary teeth, are very difficult to observe (Fig. 5). Distribution: Probably inhabits the whole of the northern and central parts of the United States and Southern Canada. Geologi- cal distribution : Pleistocene ; Loess. Habitat: Found very abund-. 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
Size: 1886px × 1325px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
