NO, 2 ZIESENHENNE: NEWOPHIURANS 31 



than half the width of proximal margin ; distally the plates become pen- 

 tagonal or hexagonal with slightly concave proximal and proximal lateral 

 margins and convex distal margins. Supplementary plates triangular, 

 distal margins convex and bearing a series of parallel minute ridges con- 

 spicuous under high magnification. Plates ys to }^ the size of upper arm 

 plates. Side arm plates wide, not meeting above or below, spine ridge 

 prominent, bearing 3 large, heavy, broad, bluntly tipped arm spines; 1^ 

 to 2 arm segments long, middle spine longest, uppermost the shortest. 



Oral shields triangular, wider than long, obtuse angle within, lateral 

 angles convex. Adoral plates narrow, not meeting within, broader dis- 

 tally. Jaws small and triangular. Four oral papillae on a side, outermost 

 bluntly pointed, longer than wide; next 2 broad, rounded, and heavy; 

 apical heavy, blunt, and rounded, slightly longer than broad. In the 

 holotype and a few paratypes the 2nd outermost papilla is divided into 

 2 or 3 fine spiniform papillae with a common base. Four broad and 

 rounded teeth, uppermost longest. 



Interbrachial spaces below covered by a thin membrane, which under 

 high magnification shows very minute scales. Genital slits large and wide ; 

 a few scales can be seen, but no genital papillae are present. First under 

 arm plate small, slightly longer than wide, distal margin convex, lateral 

 and proximal margins almost straight. Second and succeeding plates large, 

 longer than wide, proximal and distal margins convex, lateral margins 

 almost straight, plates in contact with each other. One large, oval tentacle 

 scale, half the length of under arm plate, attached to the side arm plate. 



Color. — Dried specimens, disk pale yellow with reticulating purplish 

 lines; above the arm base and between the radial shields is a purple-brown 

 area spotted with cream yellow that blends in with the reticulations of 

 the disk proximally. Upper arms greenish gray with a purple band one 

 segment wide, continuing below and spaced about 3 to 5 arm segments 

 apart. The supplementary plates on each side of the purple band are 

 creamy white. Arm spines are gray with a white base and a transverse 

 purple band above the base and on the tip. Mouth parts and under arm 

 plates are creamy white with the purple arm bands extended from above. 

 Disk below is a brown orange in the naked membrane with the disk 

 colors and reticulations extending onto the interbrachial area. 



Types. — Holotype, AHF no. 4; 88 paratypes. 



Type locality. — Holotype and 3 paratypes from Station 333-35, 

 shore, James Island, Galapagos, December 11, 1934. Eighty-five addi- 

 tional paratypes as follows: one from Station 73-33, shore, Cartago Bay, 



