. A conchological manual. Shells. INTRODUCTION. 1& structure is very curious, and they vary considerably among themselves, some of them being simply conical, others nearly flat, or discoidal, and others more or less spiral. But their principal peculiarity consists in their having a small internal process or plate, commonly named their septum, variously shaped. Septa of Limpets. The septa of Limpets assume a variety of forms, the prin- cipal of which will be seen in the accompanying The form from which the group derives its generic appella- tion is that of the cup-shaped or Cya
. A conchological manual. Shells. INTRODUCTION. 1& structure is very curious, and they vary considerably among themselves, some of them being simply conical, others nearly flat, or discoidal, and others more or less spiral. But their principal peculiarity consists in their having a small internal process or plate, commonly named their septum, variously shaped. Septa of Limpets. The septa of Limpets assume a variety of forms, the prin- cipal of which will be seen in the accompanying The form from which the group derives its generic appella- tion is that of the cup-shaped or Cyathiform species (fig. l7)' In the Crepidulse, or Slipper-Limpets, the septum is flat, reaching across the opening, like the deck of a vessel; it is then described as transverse (fig. 20). In Calyptrsea Eques- tris, it has two prominent points, and is described as hi-fur- caieJ(fig. 18). In another species, it is a three-sided plate rather spiral at the apex (fig. 19). Measurement of Cup and Saucer Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sowerby, G. B. (George Brettingham), 1812-1884. London H. G. Bohn
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