| Publication Type: | Journal Article |
| Year of Publication: | 1918 |
| Authors: | T. Wayland Vaughan |
| Journal: | Papers from the Department of Marine Biology of the Carnegie Institution of Washington |
| Volume: | 9 |
| Pagination: | 49–234 |
| URL: | http://books.google.com/books?id=tHg6AQAAIAAJ |