WEST INDIAN STARFISHES 97 



on the adjacent series of interambulaeral plates, parallel to the 

 outer row, so that they resemble a third row of interambulaeral 

 spines. These interactinal spines agree in number and stand 

 opposite to the outer interambulaeral spines. 



There are usually two madreporic plates in those specimens 

 that divide by autotomy. Specimens with any number of rays 

 from one to five are to be found. Those in the ''comet-form," 

 due to autotomy or injury, are not uncommon. 



The types of 0. ornithopus (M. and Tr.) were from Vera 

 Cruz ; those of S. stella were from Guadeloupe. 



Perrier (1875) stated that he had examined these types and 

 found them identical with L. guildingii, as well as with authentic 

 specimens from the Cape Verde Islands. Gray 's type was from 

 St. Vincent Island. 



On the American side this species occurs at the Bermudas, 

 Florida Keys, Bahamas, Vera Cruz, throughout the West Indies, 

 and south to Bahia, Pernambuco, and the Abrolhos Reefs, Brazil. 

 Cape Verde Islands (Perrier and others). The Yale Museum 

 has it from Pernambuco, Brazil (coll. C. F. Hartt, No. 4557), 

 and the comet form from the Abrolhos Reefs (coll. Hartt, No. 

 1583). 



Genus Narcissia Gray. 



Narcissia Gray. op. cit., p. 287, 1840; p. 15, 1866. Sladen, op. cit., pp. 

 398, 413, 1859. Perrier, Exped. Trav. et Talisman, pp. 329, 330, 1894. 



Ophidiasteridas with serially arranged radial plates, the me- 

 dian and two marginal rows larger; all granulated. Papula 

 stand singly or in pairs between the plates. Adambulacral plates 

 have three longitudinal series of short, thick spines, often pris- 

 matic. 



Narcissia trigonaria Sladen. 



Narcissia trig(ynaria Sladen, op. cit., p. 414, pi. Ixv, figs. 5-8, 1889. 



Rays rather long, triquetral, with a strong median radial keel 

 composed of large, somewhat swollen plates; margins rounded 

 with well developed, convex, marginal plates in both series, about 

 thirty-seven in the type. All the plates are covered with minute, 

 uniform granules. Papulae stand singly between the plates, or 

 in pairs. 



