abs.
| author | date | title | journal / publication | Girard CF | 1854 | abs. |
Researches upon Nemerteans and Planarians. I. Embryonic development of Planocera elliptica. | 27 pages, 3 tables, Philadelphia 1854. [Separately publ. J. Acad. Nat. Sc. Philadelphia. 2: 307-325] |
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