Cryptogemma periscelida
Cryptogemma periscelida, common name the Atlantic gem turrid, is a species of sea snail, a marine gastropod mollusc in the family Turridae, the turrids. Description. The length of the shell varies between 25 mm and 50 mm. (Original description by W.H. Dall) The stout shell has a fusiform shape. It is covered with a straw-colored epidermis. It is elaborately sculptured and contains 10 whorls, exclusive of the protoconch The spiral sculpture consists of: Transverse sculpture consists of coarse elevated incremental lines more or less visible over the whole shell. The aperture is rather wide The siphonal canal  is narrow and slightly curved. The outer lip shows a deep notch squared at the bottom, then strongly arched forward, later contracted for the siphonal canal. The columellar margin is simple and sharp. The inner lip is white, smooth, simple and slightly excavated . Inside the outer lip are six or eight strong lirae falling short of the margin. The columella is nearly straight, attenuated and twisted in front, making the end of the siphonal canal flare a little. There is no umbilical trace. This species is one of the most remarkable and elegant of any from the deeper waters. It  belongs to the group of which "Pleurotoma speciosa" forms a member, by its sculpture, though whether the nucleus would agree with that species is uncertain. At present our judgment on such subdivisions as "Gemmula" , founded on nuclear characters, must be held suspended. So far as our knowledge goes, nuclear characters have little absolute systematic value in this group, and their relative value remains to be determined. Distribution. "C. periscelida" can be found in Atlantic waters, ranging from the coast of North Carolina south to Colombia.