540 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



become pointed. The broadly spatnlate spines are about 3 plates 

 in length (3.0 to 4.5 mm.) ; the pointed acicular ones just beyond the 

 modified subambulacrals are a little over 4 plates in length (7 mm.), 

 the plates themselves becoming gradually longer, as is evident from 

 the above measurements. The subambulacral spines are invested in 

 sheaths bearing both major and minor pedicellariae, while on the 

 lateral spines only the minute minor pedicellariae seem to be present. 



Mouth plates each with 3 short spinelets on the actinostomial 

 margin and 2 on the distal furrow corner. Suboral spine about as 

 long as the first subambulacral spine, with a sublanceolate slightly 

 flattened tip, which is grooved lengthwise and frequently ends in 2 

 distinct, sharp points. The oral and suboral spines are heavily 

 armed with major pedicellariae. 



Madreporic body small, but on the external side of a prominent 

 protuberance, the adcentral side of which is spmy. 



Gonads and first adambulacral plates as in generic diagnosis. 



Type.— Co-t. No. 36747, U.S.N.M. 



Type-locality.— Stsitwn 5668 (lat- 2° 29' 30" S.; long. 118° 43' E.), 

 Macassar Strait, off Mamuju Island, west coast of Celebes, 901 

 fathoms, gray mud; bottom temperature, 38.2° F. ; 1 specimen. 



Bemarks. — This species has much broader proximal subambulacral 

 spines than any other known species. It differs from F. echinata 

 Sladen (if this is indeed a true Freyellaster) in lacking the conspicu- 

 ous abactinal spines. F. scalaris (A. H. Clark) has even more con- 

 spicuous abactinal spines on the rays than has echinata. 



