586 A. E. Verrill — Echinoderms of the Bermudas. 



OPHIOCOMID^ Ljtmg., 1867. 

 Ophiocoma Riisei Liitken. 



Ophiocoma Riisei Liitken, Vid. Meddel., p. 14, Jan., 1856; Add. ad Hist. 

 Oph., pt. ii, p. 143, pi. iv, fig. 6. Lyman, HI. Cat. Mus. Comp. Zool., i, p. 

 76. Yerrill, Trans. Conn. Acad., i, pt. 2, p. 341, 1868. Lyman, Report Voy. 

 Challenger, Zool., OpMuroldea, v, p. 171, 1882. 



Common from Florida and the Bermudas, throughout the West 

 Indies, to Colon and to Brazil. 



This is a large black species. It is easily distinguished from O. 

 echinata, found in the same localities, by its long, slender, upper 

 arm-spines, which in the latter are stout, blunt, swollen in the 

 middle. 



Ophiopsila Riisei Liitken. 



Ophiopsila Riisei Liitken, Add. ad Hist. Oph., pt. ii, p. 136, pi. y, fig. 2, 1859. 

 Lyman, Hlust. Catal. Mus. Comp. Zool., i, p. 150, figs. 16, 17, 1865 ; Bull. 

 Mus. Comp. Zool., v, 9, 228. Verrill, Notes on Eadiata, Trans. Conn. 

 Acad., i, p. 841, 1868. Lyman, Report Voy. Challenger, Zool. , Ophiuroidea, 

 V, p. 160, pi. xl, figs. 1-3, 1882 (anatomy). 



Florida Reefs to Brazil, shore to 57 fath. Bermuda (Lyman). 



AMPHIURID^ Ljung., 1867. 



Ophiactis Krebsii Liitken. 



Ophiactis Krebsii 'Lutken, Vid. Meddel., p. 12, 1856; Addit. ad Hist. Oph., 

 pt. ii, p. 126. Lyman, 111. Cat., i, p. Ill, figs. 10, 11. Verrill, Notes on 

 Eadiata, Trans. Conn. Acad., i, p. 341, 366, 1868; Bull. Labor. Nat. Hist. 

 Univ. Iowa, v, p. 34, 1899. 



Ophiactis Savignyi (pars) Lyman, Report Voy. Challenger, Zool. , Ophiuroidea, 

 V, p. 115, 1882. 



Mr. Lyman, in his later works, considered this identical with 0. 

 Savignyi and O. viresceyis, from the Indian and Pacific oceans 

 respectively. With this opinion I am not able to agree. 



This, like most other species of the genus, usually has six or 

 seven arms when young, and it increases by spontaneous fission. It 

 is green, variegated with white or gray. It lives in the interstices 

 of sponges and corals, often gregariously while young. 



Common in sponges and interstices of dead corals. Charleston, S. 

 C, and Florida Reefs to Rio de Janeiro, Brazil. 



