234 BULLETIN OF THE 



specimens. Station 158, 148 fathoms, 1 specimen. Station 1()4, Guadeloiipe, 

 150 fathoms, 11 specimens. Station 220, lUO fathoms, 1 specimen. Station 

 224, 114 fathoms, 1 specimen. 



O. Tnarmorea is nearest 0. nivea, from which it differs in its swollen disk- 

 plates, side arm-plate and side mouth-shields, its smaller upper arm-plates, and 

 shorter arms, and in granulation on the lower interbrachial space. 



Ophiozona clypeata sp. nov. 



Plate III. Figs. 13-15. 



Special Marks. — Eleven close-set, lumpy mouth-papillge to each angle. 

 Side mouth-shields large and wide. Three moderately stout arm-spines, about 

 as long as a joint. 



Description of an Individual (Station 219). — Diameter of disk 10 mm. 

 Length of arm 65 mm. Width of arm near disk 2 mm. Eleven short, 

 lumpy, crowded mouth-papillae to each angle, whereof the one next the outer- 

 most is widest. Mouth-shields blunt spear-head shape, with the point inward; 

 length to breadth, 1.5 : 1. Side mouth-shields rather wide and fully meeting 

 within. Under arm-plates thick, but not ridged, much wider without than 

 within where they are bounded by a wide truncated angle, while the outer is a 

 broken curve and the lateral sides are re-entering curves. Side arm-plates short 

 and stout, with a low spLiie-ridge. Upper arm-plates twice as broad as long, 

 and much wider without than within. Disk round and flat, covered with dis- 

 tinct rounded slightly swollen overlapping scales, among which the jiiima- 

 ries are conspicuous by their greater size. Eadial shields short, oval ; length 

 to breadth, 1.2 : 8. In the interbrachial spaces below, the scales are of uniform 

 size, about three in the length of 1 mm. Genital openings long, extending from 

 outer corners of the mouth-shield quite to margin of disk. Three moderately 

 stout, cylindrical, tapering, blunt arm-spines ; the two upper ones as long as a 

 joint, the lowest a little longer. Two rudely semicircular tentacle-scales on 

 the side arm-plate, whereof the one next the under arm-plate is smaller. Color 

 in alcohol, nearly white. 



Station 219, off Saint Lucia, 151 fathoms, 1 specimen. Station 232, St. 

 Vincent, 88 fathoms. 



By its smaller disk-scales and longer and more pliable arms this species 

 connects the large-scaled and stiff-armed Ophiozonse with the type 0. impressa. 

 It shows, too, the affinity of the genus to Ophiochiton through 0. lentus. 



Ophiozona nivea Ltm. 



» 



Station 129, Santa Cruz, 314 fathoms. Station 145, St. Kitts, 270 fathoms. 

 Station 146, St. Kitts, 245 fathoms. Station 147, St. Kitts, 250 fathoms. Sta- 

 tion 148, St. Kitts, 208 fathoms. Station 154, Montserrat, 298 fathoms. 

 Station 155, Montserrat, 88 fathoms. Station 172, Guadeloupe, 62-180 fath- 



