. A conchological manual. Shells. 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 The line marked a, p, 11, indicates the direction in which
. A conchological manual. Shells. 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 The line marked a, p, 11, indicates the direction in which c 2. 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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Keywords: ., bookauthorsow, bookcentury1800, bookdecade1850, booksubjectshells
