264 RECENT OPHIURANS. 



Bartholomew. St. Cruz, D. W. I., Flannegans Passage, 27 fms. Off Barbados, 

 69-76 fms. Brazil: off the Abrohlos, 30 fms. 



761. O. NOMENTIS Fahquhae, 1907. Trans. N. Z. inst., 39, p. 125. Plate 11, f. 1, 2. 



2 COTYPES. New Zealand: Cape Mabia van Dieman. 



762. O. PLANA Lyman, 1869. Bull. M. C. Z., 1, p. 330. Plate 10, f. 1, 2. 



8 specimens, including holotype and 3 paeatypes. Bermuda : Fairyland 

 Bay. North Carolina : off Cape Fear River bar. Off Georgia, 225 fms. Flor- 

 ida: OFF Caeysfokt Reef, 117 fms.; Key West, off the Toktugas. Gulf 

 of Mexico, 26 fms. 



763. O. POA Lyman, 1879. Bull. M. C. Z., 6, p. 40, pi. 13, f. 356-358. 



3 COTYPES. OFF Tristan d'Acunha, 500 fms. 



764. O. PROFUNDI Ltjtken and Mortensen, 1899. Mem. M. C. Z., 23, p. 140, pi. 6, f. 4-6. 



2 COTYPES. Gulf of Panama: southeast of Malpelo Island, 899 fms. 



765. 0. PTEROPOMA H. L. Clakk, 1911. Bull. 75 U. S. N. M., p. 134, f. 50. 



25 specimens, including 2 paratypes. Japan: off Hied Misaki Light, 

 191 fms. ; Uraga Channel, about 200 fms. 



766. 0. QUADRISPINA, sp. nov. Plate 10, f. 9, 10. 



Disk 7 mm. in diameter; arms 30-35 mm. long. Disk covered with scales, 

 which are large and circular at center of disk but become much smaller at the 

 margin, where a few of them bear, each a minute spinelet; interbrachial areas 

 below nearly bare, the dark colored thin skin carrying only minute, widely scat- 

 tered plates each of which bears a correspondingly minute spinelet. Radial 

 shields 1.8 mm. long by .8 mm. wide, sUghtly curved, nearly or quite parallel, 

 not in contact except distally in some cases. Upper arm-plates exceedingly 

 short and wide, very broadly in contact; near middle of arm, they are 1.75 mm. 

 wide and only .40 mm. long. Oral shields bud-shaped, with a notable stem-like 

 projection into the interradial area; except for this stem, the length and breadth 

 are about equal. Adoral plates small, confined to the sides of the oral shields 

 but meeting very plainly in the mid-radial hne. Oral papillae single, scale-Uke 

 on the inner end of the adoral plate. Under arm-plates hexagonal with rounded 

 angles, wider than long, broadly in contact, at least the basal ones with shghtly 

 thickened margins. Side arm-plates small; each carries a series of 4 short, thick, 

 blunt arm-spines (hence the name) of which the uppermost is longest and about 



