1890.] NATURAL 8CrKNCKS OF PHILADELPHIA. 327 



Kadius of the, disk 10 mm., leiiirtli of an arm from center of disk, 

 70 nun. 



This species is found in the West Indies, and extends nortlnvards 

 to Florida, and southwards to Bahia, Brazil. 



Florida (Say). Florida Channel, 40 fnis. (Agassiz). Antilles; 

 Tortugas; He Breton, Mississippi K. ; (30 ni. N. He Jolbos, 14 fms, ; 

 Montserrat, 88 fms. (Perrier). St. Thomas (Liitken). Brazil (Lud- 

 wig). Bahia, 7-20 fms. (Sladen). 



The following species of Laidia are found in the AVest Indian 

 region. 



Luidia clathrata, fi;\y. Jour. Acnil. Nat. Sci. Phila. (1) NUl. \', \i. 1 IL'. 

 A. Agas.^iz, Mem. Mus. Comp. Zool., V, p. IIT, pi. xx. 



West Indies; Beaufort, N. C. to Rio Janeiro. 



Luidia Senegalensis, Lam. Anim. San;* Vert. t. iii, p. 2.55. 

 IVrrier, Arch. Zool. Exp., Vol. V, p. 262. 



Luidia Marcgravii, Lutken. Vidensk. Meddel. L'^59. p. 43. 



West Indies, southward to Rio Formosa, Brazil. Also upon the 

 West Coast of Africa (Senegal). 



Luidia elegans, Perrier, Arch. Zool. Exper., t. v, p. 256. 



Florida straits (101 feet), Barbadoes (200 fathoms.) 

 Luidia convexiuscula, Perrier, Nouv. Arch. Mus. Hist. Nat. (2), T. VI. ]>. 26s. 



Lesser Antilles, and off' S. W. of Florida. (56-208 fathoms. j 

 Luidia alternata, Say, 



We.st Indies ; Florida to Bahia, Brazil. 

 Luidia Barbadensis, Perrier, op. cit., p. 267. 



Barbadoes and off*S. W. of Florida. (40-209 fathoms.) 



This species may be a long armed variety of Luidia alternata. 



A complete list of the literature of these species Avill be found in 

 Ludwig's List of Brazilian Echinoderms, Perrier's " Stellerides des 

 Dragages du Blake," and Sladen's Monograph of the "Challenger" 

 Asteroidea. 



Vera Cruz. 



Diadema setosum, Gray, Ann. Phi!., 1825, p. 4. 



A. Agassiz, Mem. Mus. Comp. Zool. Vol. Ill, 1S72-1S74. pp. 10:!, 274, 408.. Pis. lib, 

 lie. IVa, VI, Via, XXIV, XXVII. XXVIII. 



Very abundant among the reefs of the harbor of Vera Cruz. 

 Found upon the coral sand in shallow water or in rock and coral 

 recesses. Especially numerous in the shallows off" the Gallega reef. 



