Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . Fig. 208. Teeth of Valvata piscinalis. produced base, hooked and denticulated ; the threeuncini (b, c, b) are lanceolate, and toothed on eachside. The lingual teeth in NeritinafluviutiUs (fig. 209):—The central tooth (a) is minute; the first lateraltooth is large, subtriangular, succeeded by two. Fig. 209. Teeth of Neritina fluviatilis. very minute ones; the uncini are about sixty innumber; the first one is very large, and of a re-markable shape ; the rest are very slender, hooked,a
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . Fig. 208. Teeth of Valvata piscinalis. produced base, hooked and denticulated ; the threeuncini (b, c, b) are lanceolate, and toothed on eachside. The lingual teeth in NeritinafluviutiUs (fig. 209):—The central tooth (a) is minute; the first lateraltooth is large, subtriangular, succeeded by two. Fig. 209. Teeth of Neritina fluviatilis. very minute ones; the uncini are about sixty innumber; the first one is very large, and of a re-markable shape ; the rest are very slender, hooked,and denticulated. The teeth of Assiminia Grayana are seven innumber; the central with a base produced into ahorn, with five to seven pointed lobes, the firstlateral tooth with seven lobes. The second is slender,claw-like, and serrated ; the third is rounded at thetip, with minute denticulations (fig. 210).
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
