62 Ohsorvations on the Terrestrial 



EXPLANATION OF PLATES. 



Plate L Zoogenetes harpa — Say. 



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 adhei'ing 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. 



wVo/e. All the above views are more or less magnified. 



