File:Zoogenetes harpa Morse 1864.png

English: Zoogenetes harpa, a small air-breathing land snail. Plate 1 from: Morse E. S. 1864. Observations on the terrestrial Pulmonifera, including a catalogue of all species of terrestrial and fluviatile Mollusca known to inhabit the state. Journal of the Portland Society of Natural History 1 (1): 1-63, Pl. I-II

Explanation of Plate: Fig. 1 — represents natural attitude of this species. Fig. 2 — the shell of the same. Fig. 3 — represents a ventral view of this species. Fig. 4 — the oviduct with the closely adhering ovary at its summit, the oviduct being filled with four embryos in various stages of development. Fig. 5 — Ganglionic centres, surrounding the (Esophagus, of an adult. Fig. 6 — a young one just excluded by the parent. Fig. 7 — an embryo. Fig. 8 — the sub-oesophageal gangli containing the auditory vesci- cles, embryonic. Fig. 9 — Otoconites; embryonic. Fig. 10 — a row of plates from the lingual membrane of an adult. Fig. 11 — the same from an advanced embryo. Fig. 12 — the same from a less advanced embryo. Fig. 13 — the buccal plate. Fig. 14 — the shell of an embryo.

All the above views are more or less magnified.