. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida . Fig. 12 Calliostoma, showing carina or keeled. When very sharp the edge is known as the CARINA, Fig. IS in the accompanying fig- ure of Calliostoma har- risi, a fossil species from the southern states. Several of the Astraeas are strongly carinated species. Suture is that portion where the whorls Join; see Fig. lib. It is largely influenced by the convex or planate charac- ters of the whorls. It may be CANALICULATE or CHANNELLED when a broad
. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida . Fig. 12 Calliostoma, showing carina or keeled. When very sharp the edge is known as the CARINA, Fig. IS in the accompanying fig- ure of Calliostoma har- risi, a fossil species from the southern states. Several of the Astraeas are strongly carinated species. Suture is that portion where the whorls Join; see Fig. lib. It is largely influenced by the convex or planate charac- ters of the whorls. It may be CANALICULATE or CHANNELLED when a broad and deep chan- nel follows close to the junction of the whorls. This is well illustrated in Busycon canaliculatum, Fig. 13. It is CRENDLATED when the suture is inter- rupted by Indentations which break the con- tinuity. An example of this is Pyramidel- la crenulata, from Florida.
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmollusks
