648 Brett— On the Echinoderm Fauna of the Island of Ceylon. 
13. ASTROPECTEN POLYACANTHUS. 
Astropecten polyacanthus. Miiller and Troschel, Syst. der Ast., p. 69; Perrier, 
Rév. Stellér., p. 355. 
Astropecten hystrix. Miiller and Troschel, t. ¢., p. 70. 
Astropecten armatus. Miiller and Troschel, t. ¢., p. 71. Walter, Jen. Zeitsch., 
XVlil., p. 368. 
I cannot imagine why Dr. Walter uses the specific name of armatus in pre- 
ference to the familiar polyacanthus. 
14. ASTROPECTEN, sp. 
15. Lumpia MACULATA. 
LIuidia maculata. Miiller and Troschel, Syst. der Ast., p. 77; Perrier, Réy. 
Stellér., p. 338; Walter, Jen. Zeitsch., xviii., p. 368. 
Li OREMUR OTD RAG 
16. OPHIOPLOCUS IMBRICATUS. 
Ophiolepis imbricata. Miiller and Troschel, Syst. der Ast., p. 93. 
Ophioplocus imbricatus. Lyman, LIllustr. Catal. Mus. Comp. Zool., p. 69 ; 
Chall. Rep., p. 20. 
17. OPHIOCOMA ERINACEUS. 
Ophiocoma erinaceus. Miiller and Troschel, Syst. der Ast., p. 98; Lyman, 
Chall. Rep., p. 170. 
18. OPpHIOCOMA SCOLOPENDRINA. 
Ophiocoma scolopendrina. Agassiz, Mem. Soc. Sci. Nat., Netichatel, i., p. 192; 
Lyman, Chall. Rep., p. 170. 
It is almost certain that in a short time systematists will be agreed as to the 
necessity of uniting these two species of Ophiocoma. 
19. OPHIOCOMA BREVIPES. 
Ophiocoma brevipes. Peters, Archiv f. Naturg., xviii. (1852), p. 85; Lyman, 
Chall. Rep., p. 172. 
20. OPHIOCOMA PICA. 
Ophiocoma pica. Miiller and Troschel, Syst. der Ast., p. 101; Lyman, 
Chall. Rep., p. 171. 
Ophiocoma lineolata. Miiller and Troschel, t.c., p. 102. Walter, Jen. Zeitsch., 
XVlil., p. 370. 
I do not know why Dr. Walter prefers to use the term Uneolata, in favour of 
which neither usage nor priority can be cited. 
