OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 251 



52' 27" N., long. 120° 52' 18" E.) ; 45 meters (25 fathoms) ; Septem- 

 ber 18, 1909 ; Co., S. 



Two specimens (Cat. No. 41262, U.S.N.M.). 



Marougas; shore; coral head. 



Four specimens (Cat. No. E. 19, U.S.N.M.). 



No locality. 



Two specimens (Cat. No. 41261, U.S.N.M.). 



Notes. — Ophiothrix martensi has been met with in a large number 

 of localities in the Indo-Pacific region, principally at littoral stations, 

 though the Slboga collected it in the Sunda Archipelago at various 

 depths down to 73 meters (40 fathoms). 



OPHIOTHRIX MELANOSTICTA Grube. 



Plate 59, figs. 5, 6 ; plate 100, fig. 5. 



See for bibliography : 



Ophiothrix melanosticta Kcehleb ('05), p. 77, pi. 8, figs. 4-6; pi. 14, fig. 3; 

 ('07b), p. 253.— H. L. Clark ('15), p. 275. 



Localities. — Albatross station 5146; Sulu (Jolo) Archipelago, in 

 the vicinity of Siasi; Sulade Island (E.) bearing N. 18° W., 6.30 

 kilometers (3.4 miles) distant (lat. 5° 46' 50" N., long. 120° 48' 50" 

 E.) ; 44 meters (24 fathoms) ; February 16, 1908 ; co. S., Sh. 



Three specimens (Cat. Nos. 41381, E. 3, U.S.N.M.). 



Albatross station 5147; Sulu Archipelago, in the vicinity of Siasi; 

 Sulade Island (E.) bearing N. 3° E., 15.57 kilometers (8.4 miles) 

 distant (lat. 5° 41' 40" N., long. 120° 47' 10" E.) ; 38 meters (21 

 fathoms) ; February 16, 1908; co. S., Sh. 



Three specimens (Cat. Nos. 41382, E. 2, U.S.N.M). 



Albatross station 5174; in the vicinity of Jolo; Jolo Light bearing 

 E. 4.82 kilometers (2.6 miles) distant (lat. 6° 03' 45" N., long. 120° 

 57' 00" E.) ; 36 meters (20 fathoms) ; March 5, 1908; crs. S. 



Two specimens (Cat. No. E. 1, U.S.N.M.). 



Philippines (without further data). 



One specimen (Cat. No. 41383, U.S.N.M.). 



Notes. — In 1905 I gave a description of this species based upon the 

 specimens collected by the Siboga in the Sunda Archipelago ; it has 

 been found in various localities in the Indian Ocean, but it seems up 

 to the present to be always rather rare. 



The large spines of the dorsal surface of the disk are almost al- 

 ways smooth (pi. 100, fig. 5b). Among these there may be found 

 some others, very much shorter, which deserve the name of club spines 

 (fig. 5c and d). 



The first ventral arm spine at some distance from the disk trans- 

 forms into a hook with three or four branches of the usual type 



