File:Goldfish breeds and other aquarium fishes, their care and propagation - a guide to freshwater and marine aquaria, their fauna, flora and management. With 280 explanatory illustrations, printed with (14579772469).jpg

Identifier: goldfishbreedsot00wolf (find matches)
Title: Goldfish breeds and other aquarium fishes, their care and propagation : a guide to freshwater and marine aquaria, their fauna, flora and management. With 280 explanatory illustrations, printed with the text
Year: 1908 (1900s)
Authors: Wolf, Herman Theodore, 1855-
Subjects: Aquariums Goldfish
Publisher: Philadelphia : Innes & sons
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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244 MOLLUSCS, VERMES AND HYDRO/OA Margaritana. This genus of the Unionidae may be found in mostrunning streams of fresh water, and has the valves transversely elongated,inequilateral, and the hinge differs from the Unios, with which some ofthe species have been classed by Conchologists. M. margaritifera, Fig. 190, has the ovate or kidney-shaped thick andstrong valves transversely much elongated, with the umbones but slightlyraised above the line of the hinge and usually much eroded; and the hinge
Text Appearing After Image:
FIG. 190. Margaritana margaritifera. Adult. and basal margin nearly as broad before as behind the hinge, wnich isusually curved and nearly parallel, with the tips slightly truncated. Thesurface is waved with lines of growth and loosely wrinkled posteriorly andtowards the margin. The outside is pitchy-black, the inside has a green-ish border at the margin while the nacre is bluish-white shading to flesh-color in the centre of the valves. There are two cardinal teeth in the leftvalve and one in the right. The mussel is 41? inches long, 1 inches broadand 1 x4 inches thick, probably the largest freshwater mussel of the Atlanticslope, very generally distributed in the Eastern and Middle States. M. marginata, Fig. 191, has thin-ovate, anteriorly wedge-shapedvalves with small but elevated umbones, usually somewhat eroded. Theposterior hinge margin declines abruptly to form a rounded tip and a well-defined ridge extends from the um-bone to the lower forward edge andthe valves show rounded wri

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