68 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



are not very thickly covered with coarse, flat squamules, which are 

 much thicker than the paxillar spinelets, and they all carry a rather 

 small, conical, somewhat flattened spine close to the inner edge of 

 the plate, but separated from it by 1 to 3 rows of granules [original 

 description, 2 or 3]. The inferomarginals are thickly covered with 

 somewhat lengthened, broad, mostly acute squamules, without 

 spinules on the aboral border of the plates. The large marginal 

 spine, as long as 3 plates, is flat, broad and only slightly tapered, 

 but has generally a sharp point. Under it is a much smaller flattened 

 spine, and below this 2 or 3 much shorter ones still. 



There are 2 actinal intermediate plates [4 to each interradius]. 

 There are 5 furrow spines, of which the median is somewhat length- 

 ened. Of the 2 spines of the second row, the aboral is not longer, 

 but is very flat and broad, and rather acute, while the adoral is com- 

 paratively very small. On the outer part of the plate are several 

 small spinelets. 



Type-locality. — Mindanao. 



Distribution. — Palawan, Samar, and Mindanao. 



Specimens examined. — Fifty-eight from the following localities: 



Mantaquin Bay, Palawan, 4 feet; 1 specimen. 



Catbalogan, Samar, shore; 1 specimen. 



Catabato, below mouth of Mindanao E., Mindanao, 6 feet, sand 

 and mud ; 3 specimens. 



Station 5345, Malampaya Sound, Palawan Island, 7 fathoms, mud; 

 53 specimens. 



Locality doubtful, 1 specimen. 



Remarks. — The largest specimen has R=55 mm., r= 10 mm., 

 R=5.5 r. A smaller example has R=30 mm., r=:7 mm., R=4.3 r. 

 There is some variation. There are usually 1 to 5 central paxillar 

 spinelets in the Albatross specimens, and the major subambulacral 

 spine is generally a little longer than the median furrow spine. The 

 proximal inferomarginal plates sometimes have an incipient fascicu- 

 late pedicellaria near the inner end of the plate. There is consider- 

 able variation in the frequency of the spinules below the minor 

 marginal spine. 



Doderlein separates this species from andersoni and debilis as fol- 

 lows : 



«\ Spines of the superomarginal plates all very close to the inner mnrgin of 

 the plate and at least as long as the plate. The large inferomarginal 



spine on the proximal part of ray broad and flat mindanensis. 



a'. Spines of the distal superomarginal plates on the outer margin of plate and 

 shorter than the plate. Large inferomarginal spine slender through- 

 out ray, 



h^. Squanuiles of inferomarginals longer than broad andersoni. 



b*. Squamules of inferomarginals circular debilis. 



