. East coast marine shells : descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida, with more than one thousand drawings and photographs . Fig. 43 Vermetus nigricans GENUS VERMETOS "Adanson" Daudin 1800 VERMETUS NIGRICANS Dall. Shell brownish violet, irregularly convoluted. According to Johnson this is the species forming reefs of the so-called "worm ; Fig. 43 West coast of Florida to Florida Keys GENUS SERPULORBIS Sassi 1827 SERPULORBIS DECUSSATUS Gmelin. Shell rath- er solid; solitary; whorls round
. East coast marine shells : descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida, with more than one thousand drawings and photographs . Fig. 43 Vermetus nigricans GENUS VERMETOS "Adanson" Daudin 1800 VERMETUS NIGRICANS Dall. Shell brownish violet, irregularly convoluted. According to Johnson this is the species forming reefs of the so-called "worm ; Fig. 43 West coast of Florida to Florida Keys GENUS SERPULORBIS Sassi 1827 SERPULORBIS DECUSSATUS Gmelin. Shell rath- er solid; solitary; whorls rounded, longi- tudinally sculptured; decussated by incre- mental lines, color yellowish white, streaked with brown. Depth range 10-22 fathoms. PI. 46, Fig. 4 North Carolina to Florida; West Indies GENUS VERMICULARIA Lamarck 1799 A thin membranous portion, sur- rounding the operculum, permits the animal to close its shell at the aperture and with- draw far inside for safety. VERMICULARIA SPIRATA Philippi. Shell chest- nut brown or lighter in color; longitudinal- ly carinated and striated. Length 6-9 inches. This well-known shell is sometimes a violet-brown. Depth range 0-175 fathoms. The writer found it abundant in shallow wa- ter, with muddy bottom, in Cortez Bay, near Sarasota, Florida. PI. 70, Fig. 4 Vineyard Sound, Massachusetts to West Indies and Texas Family Caecidae Minute shells which develop through three growth stages. In the first the young shell is spiral, this portion being discarded after the formation of the second stage. The second, or adolescent stage, comprises a curved tube which, in turn, is subsequently lost. In the adult stage the tube is of a similar curved shape and again closed by a septum or plug. Protruding from the latter there is sometimes a mucro, or horn, formed by the apex of the cone. Development of shell is shown in Fig. 44. Certain of the species are beautifully sculptured. On account of their small size they are frequently overlooked by collec- to
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookleafnumber116
