Drillia tryonii Dall, 1889 (original combination) Clathrodrillia tryoni is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

(Original description) The appearance of the shell recalls Pyrgospira ostrearum (Stearns, 1872), but it is white, more acutely pointed, smaller, with a more gibbous varix in the adult, an umbilical chink on the columella, and a spirally threaded fasciole instead of a smooth one.

These are crossed by numerous (eleven on the last whorl but one) elevated, even, rounded threads, with about equal or wider interspaces.

On the body whorl, a quarter of a turn before the adult aperture is formed, is a prominent swollen rounded varix, or rib.

[2] This marine species occurs in the Caribbean Sea and in the Lesser Antilles (Barbados, Guadeloupe, Grenada and Saint Vincent and the Grenadines.