NO. 2 ziesenhenne: newophiurans 41 



Genus OPHIOLEPIS Muller and Troschel 



Ophiolepis plateia, new species 

 Plate 8, Figs. 4-6 



Description. — Disk diameter, 13.5 mm.; arms, 38 mm. long. Disk 

 covered with large primary plates, each surrounded by a row of single 

 smaller, regularly arranged scales. Disk very flat and depressed; 2 

 rounded protruding plates on the interbrachial margin, most conspicuous 

 from the under side. Arms flat, tapering distally; base of arm 4.5 mm. 

 wide, width midway of the arm only 2.5 mm. Radial shields large and 

 distinct, longer than broad, separated from each other and interradially 

 by a primary plate or plates, each surrounded by a single row of small 

 disk scales. 



Upper arm plates rectangular, wider than long basally, becoming tri- 

 angular distally and longer than wide; lateral margins convex basally, 

 concave distally, distal margin concave basally, almost convex distally. 

 Basally 2 triangular supplementaiy plates are inserted between the upper 

 ends of the side arm plates ; distally they are replaced by a single supple- 

 mentaiy plate. Side arm plates large, separated above by the supplemen- 

 taiy plates. There are 4 short, blunt, conical, well-spaced arm spines 

 basally, but only 3 distally, placed low down on the side arm plates. Arm 

 spines less than half the length of arm segment. 



Oral shields narrow, twice as long as wide, proximal angle acute, 

 lateral margins concave, distal margin convex. Adoral plates rectangular, 

 widest without, meeting within, slightly prolonged between the oral 

 shield and the inner side arm plate. Jaws triangular, longer than wide, 

 smaller than the adoral plates. Five oral papillae on a side, the triangular 

 outermost reaching inside the next papilla, which is angular, wider than 

 long; next squarish, followed by an angular papilla, then a pointed pa- 

 pilla; apical papilla flat and oval. Four equally long teeth, the lowermost 

 broad, cutting edge rounded, uppermost narrow, cutting edge straight. 



Interbrachial spaces below covered by 2 long genital plates which are 

 separated by irregular scales, outermost largest, and 2 large rounded 

 interbrachial plates. Two small genital slits ^ the disk radius in length. 

 Under arm plates broader than long basally, becoming longer than broad 

 distally, proximal margins convex, distal and lateral margins concave, 

 plates fully in contact. Two wedge-shaped tentacle scales, closely in con- 

 tact, abradial scale slightly larger. There may also be a small accessory 

 scale on the basal arm segments. 



