P. rotundata. P. squamis obsoletis, testæ margine rotundato.
P. saccata. P. nuda saccata erectiuscula.
P. digitiformis. P. nuda digitiformis incurva.
P. lobata. P. nuda lobata.
In addition to the printed species, an anomalous Pinna, which I doubt not was the Lingula anatina, is here described.
P. viridis. P. ovalis, basi compressa.
Generis dubii huc relata, donec certiora determinentur.
Testa utraque ovali-oblonga, viridis, intus magis pallida; quasi compressa, et fere naviculata, acutior.