OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 373 



that it might quite as well be placed in the genus Amphiophiura. 

 While S. sladeni and S. sterea have the arms short, very stout, and 

 broadened at the base, thence decreasing rapidly in breadth, the new 

 species does not have the arms much broadened at the base, and 

 their width decreases rather slowly; furthermore, the arms are 

 markedly longer than those of the two species which I have just 

 mentioned. As I have already had occasion to remark, the dividing 

 line between the genera StegopMura and AmpMophiura is not a 

 sharp one. 



This difference in the form of the arms thus immediately separates 

 /S. sterilis from S. sterea and S. sladem. Another difference is found 

 in the radial shields; these, which are a little longer and broader 

 in the new species, are not divergent ; they are in contact only in their 

 central portion, and the inner borders of the two shields of each 

 pair are parallel instead of separating and diverging considerably 

 as in S. sterea. and S. sladeni. The mouth shields are also a little 

 more elongated. The absence of a true keel on the first under arm 

 plates recalls S. sterea. The arrangement of the arm spines also re- 

 calls that species, though the secondary spines are closer together and 

 tend to form a fringe comparable to that seen in S. sladeni; in 

 8. sterea these secondary spines are more independent of each other 

 and thus more resemble the primary true spines, from which it is 

 sometimes difficult to distinguish them, and which are more numerous 

 than in S. sladeni. 



OPHIURA AEQUALIS Lyman. 



Plnte 81, figs. 2, 6, 10. 



Ophioglypha aequaUs LYMAN (78), p. 72, pi. 3, figs. 74, 75; ('82), p. 45, 

 pi. 4, figs. 14, 15. KCEHLER ('86), p. 297, pi. 6, fig. 19; ('99), p. 16, pi. 5, 

 fig. 38; ('04), p. 55. 



Ophiura aeq-ualis MATSUMOTO ('15), p. 81. H. L. CLARK ('15), p. 318. 

 MATSITMOTO ('17), p. 267. 



Localities. Albatross station 5332; Mindoro Strait; Apo Light 

 bearing S. 66 W., 33.73 kilometers (18.2 miles) distant (lat. 12 r 

 47' 15" N., long. 120 41' 00" E.) ; 1,363 meters (745 fathoms) ; 

 December 12, 1908 ; gn. M. 



One specimen (Cat. No. 41337, U.S.N.M.). 



Albatross station 5471; east coast of Luzon, San Bernardino Strait 

 to San Miguel Bay; Sialat Point Light bearing N. 71 E., 27.80 

 kilometers (15 miles) distant (lat. 13 34' 57" N., long. 123 47' 06" 

 E.) ; 1,039 meters (568 fathoms) ; June 19, 1909. 



One specimen (Cat. No. 41319, U.S.N.M.). 



Albatroxv station 5601&; Gulf of Tomini, Celebes; Limbe Islanc? 

 (NE.) bearing N., 38.36 kilometers (20.7 miles) distant (lat. 1 13' 

 10" N., long. 125 17' 05" E.) ; 1,399 meters (765 fathoms) ; No- 

 vember 13, 1909 ; gy. M. 



