Wrinkled Horse Mussel.
Generic Character.
Testa transversa, plerumque tenuis. Cardo linearis, edentulus. Lamina cardinalis glabra, aliquando levata, anticè sinu sub ligamento desinens. Impressiones musculares 3. Ligamentum externum. Animal fluviatile.
Typus Genericus Mytilus Anatinus Lin.
Shell transverse, generally thin. Hinge consisting of a simple marginal lamina without teeth, smooth or slightly raised, terminating at the anterior end in a curve or sinus below the ligament. Muscular impressions three. Ligament external. Animal fluviatile.
Generic Type Duck Mussel Pennant.
Specific Character.
A. testâ ovato-oblongâ, crassâ, convexâ, anticè obliquè rotundatâ; intus fulvâ, margine rufo; margine cardinali leviter curvato, infra umbones crasso.
Shell ovate-oblong, thick, convex, anterior obliquely rounded; hinge margin slightly curved and thickened beneath the umbones; inside fulvous, with a reddish margin.