Verrill, Notes on Radiata. 255 



outer one longest, pointed, overlapping the next, which is stout, broad, 

 blunt, and larger than the others, which decrease to the sixth and then 

 increase to the innermost ; the inner ones are more cylindrical and 

 pointed. Mouth-shields one-third longer than broad ; the outer side 

 broadest, rounded ; the sides somewhat converging, a little concave, 

 the inner lateral edges nearly straight, forming the acute inner angle. 

 Side mouth-shields naked, triangular, tlie side next the angle of the 

 mouth concave ; one of the corners reaches the genital slit, another the 

 angle of the mouth, the inner ones are widely separated by the mouth- 

 shields. Under arm-plates nearly twice as broad as long near the base 

 of arms ; the outer edge regularly and deeply concave ; the outer cor- 

 ners prolonged in an acute angle, bounded on each side by short reen- 

 tering lines ; the inner lateral lines also concave ; the inner end regu- 

 larly convex, about as broad as the concave portion of the outer edge ; 

 toward the middle of the arms they become as long as broad, but still 

 have a similar outline. Upper arm -plates nearly twice as broad as long, 

 the outer edge bounded by a slightly convex line, the inner edge by 

 a parallel, concave one, sides nearly straight, converging inwardly. 

 Side-plates encroaching but little. Disk finely and closely granulated, 

 the granules wholly or partially covering the radial shields, and cover- 

 ing the scales at the base of the arms ; just outside of the radial shields 

 and about on a level with the upper side of the arms the edge of the 

 disk rises into somewhat prominent veri'ucje, perforated at top by the 

 upper genital openings, which are surrounded with elongated, granule- 

 like papilne. Radial shields large, usually mostly concealed by the 

 granules ; the naked part when present is broad oval or nearly round, 

 widely separated, often with scattered granules. Arm-spines ten at 

 base of arms, the upper ones very small, regularly increasing in length 

 toward the lower side of arm to the ninth ; the lowest one is a little 

 shorter than the two above it, which are of equal length, and scarcely 

 reach the middle of the next side-plate. The spines are all acute. 

 Tentacle-scales broad and short, the inner one considerably largest. 



Color of upper surface when dried, yellowish brown, the arm-plates 

 speckled with dark brown ; along the middle of the arm there is a row 

 of distant, small, circular, yellowish white spots, usually divided be- 

 tween two plates ; some of the plates also have very small light spots 

 on their outer edges. Lower surface yellowish white, extending up- 

 ward in points on the sides of the arms at distances corresponding to 

 the dorsal light spots. 



La Union, San Salvador, in 6 or 7 fathoms, muddy bottom, — F. H. 

 Bradley. Two specimens. 



Tbans. Connecticut Acad., Vol., I 33 March, 1867. 



