. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida. Mollusks. EAST COAST MARINE SHELLS 103 Fig. 45 Caecum coronel- lUB, 4 mm. CAECUM CORONELLUM Dall. Shell thin, not much tapered; twenty- four equal, only slightly raised, threads; interspaces wider than threads; the tube near adult aper- ture suddenly enlarging in size; plug hemispherical; mucro small; surface glistening when perfect; young shell with much flattened plug. Length mm. Off North Carolina (14-18 fathoms); Egmont Ke
. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida. Mollusks. EAST COAST MARINE SHELLS 103 Fig. 45 Caecum coronel- lUB, 4 mm. CAECUM CORONELLUM Dall. Shell thin, not much tapered; twenty- four equal, only slightly raised, threads; interspaces wider than threads; the tube near adult aper- ture suddenly enlarging in size; plug hemispherical; mucro small; surface glistening when perfect; young shell with much flattened plug. Length mm. Off North Carolina (14-18 fathoms); Egmont Key, Florida CAECUM CAROLINIANUM Dall. When living cov- ered with a thin yellow epidermis; white or translucent underneath or streaked with white; shell stout, thick arched; lines very faint; aperture simple; posterior end simple; plug conical, mucro formed by apex of cone. Length mm. PI, 54, Fig. 10 Off North Carolina (15 fathoms); Egmont Key, Florida CAECUM COOPERI S. Smith. About twenty-four rounded longitudinal ribs crossed by numer- ous rings, the latter not so distinct at extremities of tube where ribs become obso- lete. Plug mucronate with apex inclining to left; lateral profile concave; operculum concave. Length 3,5 mm. The color is white, shell not very thin, moderately curved. PI. 66, Fig. 8 Vineyard Sound, Massachusetts to Florida CAECUM FLORIDANDM Stimpson. In the adult stage it is recognizable by its comparative- ly large size and numerous an- nulations (those nearest the aperture being most distant and strongest); fine longitud- inal striae, particularly be- tween the rings. The plug has a slender mucro, set to the right and projecting from an Caecum flori- almost flat surface. Length danum, 2 mm. g mm. This species lives in shallow water and usually is the most plentiful Caecum in "drift" on the Florida beaches. Depth range 0-18 fathoms. Fig. 46 North Carolina to Florida. Fig. 46 GENUS MEIOCERAS Carpenter 1858 MEIOCERAS NITIDUM Stimpson. Shell minute
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmollusks
