. Annals of the Lyceum of Natural History of New York. Natural history; Natural history -- New York (State); Science; Science -- New York (State). Notes on Lingual Dentition of MoIIusca. 287 Helicina occulta, Say. Lingual membrane long and narrow. Teeth , in transverse, arching rows. Centrals upright, longer than wide, widest at the horizontal base, slightly narrowing towards the apex, which is nearly as wide as the base, broadly recurved and Fio. a. Lingual dentition of Helicina occulta, Say. denticulated at its cutting edge. First lateral oblong, shorter than the central, rounded
. Annals of the Lyceum of Natural History of New York. Natural history; Natural history -- New York (State); Science; Science -- New York (State). Notes on Lingual Dentition of MoIIusca. 287 Helicina occulta, Say. Lingual membrane long and narrow. Teeth , in transverse, arching rows. Centrals upright, longer than wide, widest at the horizontal base, slightly narrowing towards the apex, which is nearly as wide as the base, broadly recurved and Fio. a. Lingual dentition of Helicina occulta, Say. denticulated at its cutting edge. First lateral oblong, shorter than the central, rounded at base, narrowed towards the apex, which is broadly recurved and denticulated ; this lateral is in- clined obliquely from the central, its apex being reflexed in the same direction. The second lateral resembles the first lateral in every particular, but is much less wide. Third lateral perpendi- cular, longer than broad, triangular, its apex small, reflexed and denticulated. Fourth lateral very long, irregular, jaw shaped, its lower edge for one-half its length furnished with four strong, large, acute, beak like denticles; the left end of this lateral is produced in a horizontal direction, at right angles to the direction of the balance of the tooth, is excavated above and below, and in some instances appeared to have a wing-like expansion behind the uncini. Fifth lateral quite small, subcircular, its apex broadly refleeted and denticulated, the whole tooth fitting into the upper excavation of the horizontal portion of the fourth tooth. The uncini, more than twenty-five in number, are long, slender, crowded, the apex reflexed and continued in three fringe-like denticles. There seems to be great uniformity in the teeth of the different. 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 Lyceum of Natural Histor
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