Narcissia

Key to species in the genus Narcissia

1. Carinal ridge conspicuous, undulating in vertical and horizontal planes from center of disc to mid­point of arms. Red to scarlet in life. Western Atlantic ............................................ Narcissia ahearnae new species

­ Carinal ridge conspicuous or inconspicuous, straight, never undulating.................................................... 2

2. Papular pores mostly single. First subambulacral row of spines not similar to furrow spines................... 3

­ Papular pores mostly paired. First subambulacral row of spines similar to furrow spines. Cream blotched with rust red in life. Western Atlantic ..................................................... Narcissia trigonaria Sladen, 1889

3. Subambulacral spines granuliform, in two rows of four. Color in life bright scarlet, paler below. Eastern Atlantic .......................................................................................... Narcissia canariensis (d’Orbigny, 1839)

­ Subambulacral spines truncated, in three rows of three. Color in life orange red. Eastern Pacific........................................................................................................................ Narcissia gracilis A. H. Clark, 1916