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CYMATIIDAE 195<br />

enamel-white. Enamel, single tooth on parietal wall near the top of the aper-<br />

ture. Operculum chitinous, thick, brown. A common offshore species in<br />

its northern range.<br />

Genus Cymatium Roding 1798<br />

Subgenus Cymatiufn s. str.<br />

Cymatium femorale Linne Angular Triton<br />

Southeast Florida and the West Indies.<br />

Plate 5d<br />

3 to 7 inches in length, with 2 or 3 former varices; outer lip flaring,<br />

thickened into a noduled varLx which is drawn up to a point posteriorly.<br />

Columella with i small fold and above it sometimes several much smaller<br />

ones. Color varies from brownish to reddish orange. Not uncommon in the<br />

West Indies in shallow water among eel-grass.<br />

Subgenus La?npusia Schumacher 1817<br />

Cymatium martinianum Orbigny Atlantic Hairy Triton<br />

North Carolina to southeast Florida and the West Indies.<br />

Plate 9I<br />

1% to 3 inches in length; old varices strong, beaded, and spaced % of<br />

a whorl apart. Spiral sculpture of a dozen or so squarish, irregularly sized,<br />

weakly beaded cords. Aperture orange-brown with the parietal area darkbrown<br />

between the white teeth. Periostracum very thick, matted, lightbrown.<br />

The embryonic shell is about 4 mm. in length, glossy-brown, with<br />

a flaring lip which has a small stromboid notch. Dissentoma prima Pilsbry<br />

1 945<br />

is this species. C. velei Calkins is also a synonym. C. aquatile Reeve and<br />

C. pileare Linne are names applied to Indo-Pacific forms, and not this species.<br />

Common in shallow water.<br />

Do not confuse with C. chlorostomum which has just inside its outer lip<br />

a series of single, rather large, whitish teeth, instead of smaller, paired,<br />

yellowish brown teeth.<br />

Cymatium gracile Reeve Dwarf Hairy Triton<br />

North Carolina to Key West and the West Indies.<br />

Plate 2511<br />

I inch in length, with only one or no former varix. Whorls squarish<br />

at the shoulder where there are 2 spiral rows of prominent beads. The last<br />

whorl has only i row of about 6 to 8 rather large tubercles in addition to<br />

spiral and axial threads. Siphonal canal moderately long, slender. Color<br />

whitish with i or 2 orange-brown bars on the varix. Periostracum rather<br />

thick, gray-brown. Uncommon below low-water line.

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