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The multi-select list box can be used to select zero , one , or several entries from the list ( see " Input Types " , above ) . Note that 500 taxonomic records amounts to more than a megabyte of data . Yet this cobra is patternless . The shells are large , depressed or bulimoid , and abundant . Note that 1000 taxonomic records amounts to more than a megabyte of data . As I walk toward it , it rears up and spreads its patternless hood-a sign of the new cobra . Description : A large depressed shell with a reflected lip and rimate umbilicus.The whorls have a single wide spiral band on the periphery . There they remained glued to the tablet until about 15th March 1850 when examining some shells in the same case a recently formed epiphragm was noticed over the mouth of one of the snails .