OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 395 



meters (22 miles) distant (lat. 10 02' 45*' N., long. 121 48' 15" E.) ; 

 1,752 meters (958 fathoms) ; February 4, 1908; gy. M. Glob. 



One specimen (Cat. No. 41370, U.S.N.M.). 



Albatross station 5263; off eastern Mindoro; Point Origon bearing 

 N. 85 E., 52.45 kilometers (28.3 miles) distant (lat. 12 38' 30" N., 

 long. 121 37' 30" E.) ; June 4, 1908. 



One specimen. 



Albatross station 5423; Jolo Sea; Cagayan Island (S.) bearing 

 S. 11 E., 8.89 kilometers (4.8 miles) distant (lat. 9 38' 30" N., long. 

 121 11' 00" E.) ; 929 meters (508 fathoms) ; March 31, 1909; gy. M., 

 co. S. 



Two specimens (Cat. No. 41372, U.S.N.M.). 



Albatross station 5429; eastern Palawan and vicinity; Fondeado 

 Island (SE.) bearing N. 18 E., 27.80 kilometers (15 miles) distant 

 (lat. 9 41' 30" N., long. 118 50' 22" E.) ;. 1,401 meters (766 fath- 

 oms) ; April 5, 1909 ; gn. M. 



One specimen. 



Description. I shall describe the species especially from the speci- 

 men from station 5127, of which I show the ventral surface on plate 

 91 as figure 2, and from the largest specimen from station 5423, the 

 dorsal surface of which is shown in figure 3. In the latter the diam- 

 eter of the disk is 20 mm., and one of the arms, which is preserved 

 for almost its entire length, reaches almost 80 mm.; in the other 

 specimen from the same station, which is identical with it, the diam- 

 eter of the disk is 13 mm. only. In the specimen from station 5127 

 the diameter of the disk is 17 mm., and the arms are broken off 

 rather close to the base. The largest specimen is that from station 

 5263, in which the diameter of the disk reaches 23 mm. 



The disk is pentagonal, with the sides straight ; the dorsal surface 

 is plane and the ventral surface is slightly convex; the borders are 

 rounded. 



The arms are rather narrow, almost cylindrical, with the ventral 

 surface slightly flattened ; they measure 3.5 mm. in width at the base 

 in the specimen from station 5127. 



The dorsal surface of the disk shows a circular central region 

 bounded by the rounded apices of the radial shields, which are very 

 large and covered with numerous subequal, small, and nonimbricated 

 plates, among which it is impossible to distinguish the least indica- 

 tion of primary plates. In the interradial spaces and between the 

 two shields of each pair the plates become larger. In the radial 

 spaces there is only to be distinguished a single row of three or four 

 tandem plates, of which the proximal is more elongated than the 

 others. In the interradial spaces there is a large triangular plate 

 almost as broad as long or a little broader than long, with a proximal 



