34 Proceedings of the Biological Society of Washington. 



spines sometimes in a traaisverse series at middle of plate or in an oblique 

 series; outer spine of first 10 plates with a flaring truncate tip, ending in 

 numerous points; each mouth plate with 2 large pointed suboral spines. 

 Breadth of disk equaling 3K times width of ray at base (6 mm.). R= 

 205 + mm., r=10.5 mm. (small section from tip of ray missing). 



Type— Cat. No. 37,024, U. S. N. M. 



Type-locality. — Station 5348, Palawan Passage, 375 fathoms, coral sand, 

 bottom temperature, 56.4° Fahr. 



Stegnobrisinga new subgenus. 



Diagnosis. — Integument between the costal arches of ray strengthened 

 by many close-set, mostly contiguous or sometimes overlapping papery 

 plates of irregular form and conspicuous size, completely filling the inter- 

 spaces; proximal subambulacral spines acicular, as in typical Brisinga. 

 Type, Brisinga placoderma. 



The numerous costpe will at once separate this subgenus from Freyella, 

 which has a characteristic appearance, quite unlike that of Stegno- 

 brisinga. 



Brisinga (Stegnobrisinga) placoderma new species. 



Diagnosis.— Hays 13 or 14. Costpe 35 to 40, close together and not 

 very prominent; intercostal areas paved with close-set, irregular, often 

 overlapping papery plates devoid of spinelets; costal arches fairly regular 

 and parallel, opposite every adambulacral, or occasionally more frequent, 

 but only every third to fifth with a lateral spine; disk with beveled border 

 and with close-set isolated spinelets and conspicuous slender-jawed pedi- 

 cellarise; adambulacral armature variable, usually 2 furrow spinelets at 

 each end of the furrow margin, or 1 aboral and 2 adoral about as long 

 as the plate, and a subambulacral spine 2)4 to 3 plates in length. Breadth 

 of disk equal to 3)^ to 4 times width of ray at base (8 mm. ). Rays long. 



Type.— Ca.t. No. 37,025. U. S. N. M. 



Type-locality. — Station 5648, Buton Strait, Celebes, 559 fathoms, green 

 mud, bottom temperature, 39.2° Fahr. 



Freyella spatulifera new species. 



Diagnosis. — Rays 14, not very long. Disk with a beveled margin, 

 covered with a close, uniform nap of mostly solitary, delicate spinelets ; 

 disk plates not distinguishable. Genital region of ray short, slightly 

 swollen, the spinelets in clusters of 2 to about 6 per plate. On all but 

 basal fourth of ray there are low, transverse, parallel ridges, caused by 

 the plates being slightly elevated, upon which the spinelets are more 

 numerous than in the narrow intervening areas. These ridges resemble 

 somewhat the costse of Brisinga, but are much less prominent. A slender, 

 needle-like spine on the side of every adambulacral, beginning with the 

 eighth, increases in length until equal to about 6 or 7 adambulacral 

 plates. Adambulacral armature at base of ray consists of 1 furrow spine- 



