East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida eastcoastmarines00rome Year: 1937 Fig. 10 Bulbous nucleus the different charac- ter of its surface. In many species it is glassy. The distinc- tive sculpture has al- ready been referred to. An example of a bulbous nucleus in Voluta mamilla, from Austra- lia, is shown in Fig. 10. See also descrip- tions of Volutidae, p. 127. The Apex. The tip or beginning of the shell which is the top of the univalve illustrations shown in this volume. Fig. 11a.
East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida eastcoastmarines00rome Year: 1937 Fig. 10 Bulbous nucleus the different charac- ter of its surface. In many species it is glassy. The distinc- tive sculpture has al- ready been referred to. An example of a bulbous nucleus in Voluta mamilla, from Austra- lia, is shown in Fig. 10. See also descrip- tions of Volutidae, p. 127. The Apex. The tip or beginning of the shell which is the top of the univalve illustrations shown in this volume. Fig. 11a. Only the French figure shells with the apex pointed downward. 11a. apex lib. suture — lip. periphery- - lie varlx — lid. umbilicus llf. columella-' llg. anterior canal •y llh. spire _llj. posterior canal (if present) Ilk. outer lip ^ 11m. mouth or apterture Fig. 11 Illustrating the technical terms applied to the various parts of a univalve shell The Spire. This embraces the en- tire univalve shell with the exception of the final whorl. Fig, llh. It may be DIS- COIDAL, resembling a disk, as in Skenea, elongated as in Terebra, or one of almost endless intermediate stages. Base of Shell. The opposite ex- tremity to apex; also called anterior end of univalves or most recently built portion. Periphery is that portion of each whorl which is most outwardly developed and usually midway between suture and base. Fig. lip. It may be more or less rounded
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