P. testâ sub-æquivalvi, brunneâ, longitudinaliter creberrimè elevato-radiatâ; intus albidâ, longitudinaliter sub-radiatâ; long. 24⁄8; lat. 24⁄8; poll.
Obs. auribus inæqualibus.
Habitat in freto Magellanico passim. Mus. nost.
17. Pecten vitreus.
P. testâ subæquivalvi, translucente, longitudinaliter multi-sulcatâ; sulcis convexis flavidulis, valvâ inferiore pallidiori; long. 19⁄16; lat. 14⁄8; poll.
Obs. Auribus inæqualibus.
Habitat in freto Magellanico passim. Mus. nost.
This shell is found attached to the leaves of the Fucus giganteus, and, with other Mollusca, is the food of the Steamer or Race-horse Duck (Micropterus brachypterus and M. Patachonicus).