. The shell book . FRESH-WATER MUSSELSTriton* margaritacca. 2 Anodonta marginal*. 3 Lamfsilis alatu,. 4 Unio complanatus. 5 Unio 1 Anodonta grandis. FRESH WATER MUSSELS2 Unto sfiinosa. 3 Tritigoma tubcrculata. 4 Quadrula plicata. The Pearly Fresh-water Mussels larger than outer pair; all occupied by marsupia in breeding time,forming smooth pads. Ninety-nine species. The type described above is Q. metanevra, Raf. It occursin the Mississippi drainage area except in its southern portion,and extends to the Tennessee and Arkansas rivers. It is one ofthe striking species. A row of nodule
. The shell book . FRESH-WATER MUSSELSTriton* margaritacca. 2 Anodonta marginal*. 3 Lamfsilis alatu,. 4 Unio complanatus. 5 Unio 1 Anodonta grandis. FRESH WATER MUSSELS2 Unto sfiinosa. 3 Tritigoma tubcrculata. 4 Quadrula plicata. The Pearly Fresh-water Mussels larger than outer pair; all occupied by marsupia in breeding time,forming smooth pads. Ninety-nine species. The type described above is Q. metanevra, Raf. It occursin the Mississippi drainage area except in its southern portion,and extends to the Tennessee and Arkansas rivers. It is one ofthe striking species. A row of nodules go down the posteriorridge. Q. undulata, Barnes, has wavy radiating ridges from thebeaks, forming sharp points. It is the blue point of the pearlbutton factories. Habitat.— St. Lawrence basin, Red River of the North,Lake Winnepeg, Mississippi basin, Alabama River system, wes-tern and southwestern Texas. Q. plicata, Say, is a handsome, ribbed species closely re-lated to undulata. It is a blue point. Habitat.— Red River of the North, northward; Mississippidrainage to the Tennessee and Arkansas rivers. Q. ebena, Lea, is a solid, ro
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Keywords: ., bookcentury1900, bookdecade1900, bookidshellbook00r, bookyear1908
