A Manual of Conchology / According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.

by Thomas Wyatt

Hiatella biaperta.

H. Arctica. The Arctic Hiatella.

Shell small, transversely oblong; apices truncated, with two divergent spring ridges; a small tooth on each valve; cream colour, with decussated striæ; inside pearly.

H. biaperta. The double-clefted Hiatella. Pl. [10], fig. 4.

Species that has only a single tooth on one valve; yellowish white.

5. Isocardia. Three species.

Taken from the Chama of Linnæus on account of a peculiarity in the shape of the cardinal teeth, and the singular curvature of the umbones.

Isocardia cor.

I. semisulcata.

I. Moltkiana.