OPHIURANS OF, THE PHILIPPINE AND ADJACENT WATERS. 311 



Notes. — The diameter of the disk is 7.5 mm. ; the arms are broken 

 off near the base. 



The specimen agrees in every way with the type series which I de- 

 scribed in 1904 from individuals collected by the Siboga between 2° 

 N. latitude and 8° S. latitude and 119°-127° E. longitude, at depths 

 varying from 1,158 to 1,301 meters (635 to 711 fathoms). 



OPHIODORIS MALIGNUS Kcehler. 



Ophiodoris malignus Kcehleb ('04), p. 73, pi. 12. figs. 5, 6. — H. L. Clark 

 ('15), p. 290. 



Locality. — Albatross station 5135; in the vicinity of Jolo; Jolo 

 Light bearing S. 46° W., 22.05 kilometers (11.9 miles) distant (lat. 

 6° 11' 50" N., long. 121° 08' 20" E.) ; 294 meters (161 fathoms) ; 

 February 7, 1908 ; f ne. co. S. 



One specimen (Cat. 41335, U.S.N.M.). 



Notes. — The diameter of the disk is 6 mm.; the arms, which are 

 long and slender exceed 60 mm. in length ; they are all intact. 



The six primary plates of the dorsal surface of the disk are very 

 distinct. The adoral plates are not strictly limited to the sides of the 

 mouth shield as in the type, but they may come into contact in the 

 median interradial line by means of an extremely narrow prolonga- 

 tion. 



The color of the dorsal surface of the disk is a slightly olivaceous 

 gray, but some plates are lighter than others, becoming almost white. 

 The upper arm plates show a median spot darker than the adjacent 

 parts, which sometimes extends in such a way as to form a ring, 

 though this is only very slightly marked. 



Family OPHIOCOMIDAE. 



The species belonging to the genus Ophiocoma known up to the 

 present time are 21 in number; these are, alphabetically arranged, 

 as follows : 



Ophiocoma aethiops Liitken. 



Ophiocoma alexandri Lyman. 



Ophiocoma bollonsi Farquhar. 



Ophiocoma brevipes Peters. 



Ophiocoma brcvispina Smith. 



Ophiocoma canaliculata Liitken. 



Ophiocoma dbderleini Loriol. 



Ophiocoma echinata (Lamarck). 



Ophiocoma erinaceus Miiller and Troschel. 



Ophiocoma insularia Lyman. 



Ophiocoma lineolata Miiller and Troschel. 



Ophiocoma lubrica Kcehler. 



Ophiocomn marmorata Marktanner. 



Ophiocoma parva H. L. Clark. 



