| Authors(s) | Stimpson, W. |
| Year | 1851 |
| Title | Descriptions of two new species of shells from Massachusetts Bay, namely: Spirialis Gouldii, and Thracia Couthouyi, and a Holothuria, under the name of Anaperus unisemita. Proc. Boston Soc. Nat. Hist. 4 ( |
| Authors(s) | Stimpson, W. |
| Year | 1851 |
| Title | Descriptions of two new species of shells from Massachusetts Bay, namely: Spirialis Gouldii, and Thracia Couthouyi, and a Holothuria, under the name of Anaperus unisemita. Proc. Boston Soc. Nat. Hist. 4 ( |