Publisher's Synopsis
Excerpt from Eocene Euthecosomatous Pteropoda (Gastropoda) Of the Gulf and Eastern Coasts of North America
Coiled Species are illustrated in the traditional North American orientation with the apex up (dorsal) and the aperture below (ventral). Uncoiled or tubular spe cies are described with the aperture up (ventral) and the protoconch down (dorsal).
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