NO. 2 ziesenhenne: newophiurans 13 



Station 750-37 had intact disks, and on the disk margins were several 

 compact groups of 3, 4, or 5 large conical, blunt-tipped spines, heavier 

 and twice as long as the disk spines. The distinctive character is the wide 

 oral shields with thin marginal granules. This species is closely related to 

 O. bairdi Lyman but differs in having a triangular oral shield, 2 or 3 

 tentacle scales on the 8 to 10 basal arm segments, and a distinct series of 

 enlarged granules on the distal margin of the oral shields. It is because of 

 this palisade or fence on the oral shields that the name phragma was 

 chosen. 



Genus OPHIOMYGES Lyman 



Ophiomyces multispinus, new species 

 Plate 3, Figs. 1-4 



Description. — Disk diameter, 5 mm.; disk height, 4.5 mm.; arms, 23 

 mm. long. Disk conical, almost as high as wide ; interradius produced to 

 form a pronounced ridge, while the area directly above the arm base is 

 concave. Disk scales numerous, circular, and overlapping; many of them 

 are beset with short, delicate, finely tapering, pointed spines. At the apex 

 of the disk are 5 heavy, long, gradually tapering spines, about 1 mm. in 

 length and longitudinally ribbed. No radial shields can be seen, but the 

 spine-bearing scales are fewer in the region of the arm base. 



Arms short, heavy, and rapidly tapering. First 3 upper arm plates 

 overlapping, small, oval, broader than long, with convex distal margins. 

 Fourth plate triangular, broader than long with the peak within. Fifth 

 plate triangular, broader than long, proximal margins concave, distal 

 margin convex. The 1st to 5th upper arm plates separate the side arm 

 plates, from which point the side arm plates are in contact above. Suc- 

 ceeding plates broader than long, proximal margin slightly convex, distal 

 margin deeply convex. Plates reduce in size distally to the arm extremi- 

 ties, where they are barely visible. Side arm plates broad with a promi- 

 nent spine ridge, separated from each other by a naked membrane. They 

 meet above and below except the 3 basal segments above, where the upper 

 arm plates separate them. Arm spines, 9, covering the upper side of the 

 arm. Uppermost fine, delicate, and shortest; gradually they become longer 

 below, to the 3rd upper spine, which is the longest, more than 1^ arm 

 segments in length. Undermost 4 spines heavy, curved, longitudinally 

 striated, undeiTnost 2 slightly shorter; spines become fewer and relatively 

 shorter distally. 



To 



