T. ostracea.
T. radiata. The radiated Tellen. Pl. [8], fig. 5.
Shell elongated; posterior side shorter and more narrow than the anterior.
T. foliacea. The foliaceous Tellen.
Species transversely oblong; upon the edge of the front side of either valve are rows of serrated teeth, running from the apex to the margin.
T. bimaculata. The double-spotted Tellen.
Species orbicular, easily known by answering to its common name.
T. fabula. The false Tellen.
Shell very thin, pellucid, and oval; yellowish colour, darker towards the umbo, which is nearly central, pointed and turned a little to one side; anterior side slopes to an obtuse point; posterior side large and rounded; hinge with three teeth in one valve and two in the other.
T. scobinata. The rasp Tellen.