332 PROCKEDINUS OF THE ACADEMY OF [1890. 



Ophiothrix angulata, Say, Jour. Acad. Xat. Sci. Phila. (1) V, p. 1 1."). 



Lymau, Mem. Mus. Comp. Zool., Vol. I, p. 162, PI. 11, Figs 1-.3; " Clialienger '" 

 Report on the Ophiuroidea, 1882, p. 219. 



A yoiino; specimen was brought up on a coral from about eight 

 feet of water in the harbor of Vera Cruz. 



This species is found abundantly throughout the West Indies, and 

 extends northward to Beaufort N. C, and southward to Rio Janeiro. 



Beaufoil, N. C. (Nachtrieb). Fort Johnston, N. C. (Ayres). 

 Charleston S. C. (Say). Waccamaw, S. C; Key West, Fla. (Lyman). 

 Charlotte Harbor, Fla. ; Tortugas (Ayres). Off Bermudas, 32 faths. 

 (Lyman). Guadiana Bay, Cuba; Bahia Honda., Cuba; Jeremie, 

 Hayti ; St. Thomas (Lyman). St. Bartheleniy ; Tortola, (Ljung- 

 man). Sombrero, 54 faths. ; Barbadoes, 100 faths. (Lyman). Mugeres 

 Island, Yucatan ; Aspinwall ; Fernando Noronha, (Lyman). Para- 

 hyba do Norte ; Pernambuco ; Rio Formoso ; Plataforma ; Mar 

 Grande, Mapelle ; Bay of Bahia; Abrolhos Islands (Rathbuu). Off 

 Bahia, 7-20 faths. ; OfTCape Frio, Brazil, 35 faths. (Lyman). Rio de 

 Janeiro (Rathbun). 



Geographical distribution. 

 In indicating the geographical range of the species collected by 

 the Expedition, I have endeavored to confine the area of distribu- 

 tion, so that it should include only those localities in which the 

 species are constantly found in greater or lesser abundance; and I 

 have, as far as the data at my disposal would permit, avoided includ- 

 ing those localities in which only occasional or dead specimens occur. 

 A good illustration of this principle is the distribution of Mellita 

 pentapora. Dead specimens are found as far North as Vineyard 

 Sound, but living specimens according to Professor Verrill do not 

 occur north of Cape Hatteras, and I have therefore given Cape 

 Hatteras as the northern limit of distribution of this species. The 

 amount of collecting that has been done upon the shores of the 

 southern United States is quite small, and it is therefore difficult to 

 define with accuracy the limit of the northerly distribution of West 

 Indian Echinoderms. The same observation with respect to the 

 southern limit of distribution applies to the coast of Brazil, 

 although much valuable information has been acquired through the 

 collections made by Mr. John C. Branner, Professor Chas. Fred. 

 Hartt, and their associates and assistants. It is desirable that 

 thorough collections should be made on these coasts and also in the 

 West Indian islands, with the object of ascertaining accurately the 



