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. 9 Plaits on columella The Nucleus is that portion of the shell which emerged from the egg or ovum. It may consist of one or several whorls and usually can be recognized on account of 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
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. 9 Plaits on columella The Nucleus is that portion of the shell which emerged from the egg or ovum. It may consist of one or several whorls and usually can be recognized on account of 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
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