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Cymatiu77t chlorostomwn Lamarck Gold-mouthed Triton Plate 25q Southeast Florida and the West Indies. Bermuda. % to 2% inches in length; coarsely corrugated by spiral, noduled cords; varices spaced 73 of a whorl apart. Shell ash-gray with brown flecks and characterized by an orange mouth with white teeth. A common West Indian species which is also abundant in the Indo-Pacific. See differentiating re- marks under C. martinianum. Subgenus Tritoniscus Dall 1904 Cymatium labiosum Wood Lip Triton Plate 25m Florida Keys and the West Indies. Shell % inch in length, much like Cyinatiwn gracile, but heavier, with a much shorter siphonal canal, slightly umbilicated, and with strong spiral cords on the base of the shell. Uncommon in intertidal reef areas. Subgenus Gutturnium Morch 1852 CymatiuTn muricinum Roding Knobbed Triton Plate 251 Southeast Florida and the West Indies. Bermuda. I to 2 inches in length; characterized by a thickened cream parietal shield and a long, bent back siphonal canal. Color ash-gray, sometimes dark- brown with a narrow cream, spiral band. Not uncommon in intertidal reef areas. Interior of aperture brownish red to yellowish white. C. tube- rosum Lamarck is a later name for this species. Subgenus Ranularia Schumacher 181 7 Cymatium cynocephahwi Lamarck Dog-head Triton Plate 9J Southeast Florida and the West Indies. 1V2 to 2^ inches in length; with globular whorls which are squarish at the shoulder. Siphonal canal long and slender. Usually with only one former varix. Apical whorls cancellate; last whorl with slightly noduled, spiral cords. Parietal wall with an oval splotch of dark-brown, over which run light-orange spiral cords. Uncommon in Florida. The subgenus Tri- tonocauda Dall 1904 is the same as Ranularia. Genus Distorsio Roding 1798 Distorsio clathrata Lamarck Atlantic Distorsio Plate 2533 North Carolina to Florida, the Gulf States and the Caribbean.