. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. Ostrea CoitloJii. Lower Greensand. ceous strata. No single genus of Bivalves is, however, so highly characteristic of the Cretaceous period as Inocej-ainus, a group belonging to the family of the Pearl-mussels {AvkididcB). The shells of this genus (fig. 198) have the valves unequal in size, the larger valve often being much twisted, and both valves being marked with radiating ribs or concentric furrows. The hinge-line is long and straight, with numerous
. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. Ostrea CoitloJii. Lower Greensand. ceous strata. No single genus of Bivalves is, however, so highly characteristic of the Cretaceous period as Inocej-ainus, a group belonging to the family of the Pearl-mussels {AvkididcB). The shells of this genus (fig. 198) have the valves unequal in size, the larger valve often being much twisted, and both valves being marked with radiating ribs or concentric furrows. The hinge-line is long and straight, with numerous pits for the attachment of the ligament which serves to open the shell. Some of the Inoceraini attain a length of two or three feet, and fragments of the shell are often found perforated by boring. 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 Nicholson, Henry Alleyne, 1844-1899. Edinburgh, London, Blackwood
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Keywords: ., bookaut, bookcentury1800, bookdecade1870, booksubjectpaleontology
