MUSEUM OF COMPARATIVE ZOuLOGY. 127 



two smaller, and then a squarish marginal plate. Radial shields swollen, longer 

 than wide, three-sided, with angles rounded, separated their entire length by 

 a wedge of three plates, whereof the innermost is largest and connects with a 

 primary plate ; length to breadth 1.3 : 1. Lower interbrachial space covered 

 by two very irregular transverse rows of long rounded plates. Genital scales 

 long and narrow, curved and tapering. Four short blunt arm-spines, the 

 three lowest longest, and about half as long as an arm-jcnnt. Two tentacle- 

 scales on the first two pairs of tentacle-pores, a small one within and larger 

 one without ; beyond this there is only one large round scale. Color in alco- 

 hol, white. 



A smaller specimen, whose diameter of disk was 3.5 mm., was similar, ex- 

 cept that the disk-plates were fewer and more regular, and the radial shields 

 were scarcely separated. 



Station 173, off Matuka, Fiji Islands, 310 fathoms, 3 specimens. 



Ophiozona antillarum sp. nov. 



Plate VI. Figs. 153, 154. 



Special Marls. — Two short arm-spines, upper one longer. Arm of medium 

 height. Side arm-plates somewhat flaring outward. Radial shields large, 

 pointed without and within, nearly joined at their middle point. 



Description of an Individual (Station 23). — Diameter of disk 8 mm. Width 

 of arm, without spines, close to disk 1.8 mm. Four short, rounded, close-set 

 mouth-papilla) on each side, and two longer and sharper at apex of angle. 

 Mouth-shields as long as broad, with an angle within, bounded by re-entering 

 curves, and outer edge much rounded ; length to breadth 1.5 : 1.3. Side mouth- 

 shields short and thick, wide without, meeting broadly within. First under 

 arm-plate small, pointed, transverse oval in shape ; second plate large pen- 

 tagonal, with inner angle truncated, lateral sides having a short but deep re- 

 entering curve, and outer edge neatly curved ; the plates beyond have a long 

 sharp angle within, and very short lateral sides. Side arm-plates wide, and 

 somewhat swollen, and flaring outward, meeting below beyond the fourth un- 

 der arm-plate, and above beyond the first upper plate, which is much swollen 

 and narrow fan-shaped, with an angle inward. Disk round, flat, and rather 

 thin ; in centre a rosette of .six large, irregular, rounded primary plates, the five 

 outer ones separated from each other by pairs of small, thick, angular scales. 

 In the interbrachial spaces are numerous small, and three large jjlates in a 

 radiating line, two long hexagonal and one larger and rounded on the margin. 

 Radial shields somewhat sunken, longer than wide, with irregularly curved 

 outlines, and a blunt angle Avithin and without, separated at their inner end 

 by a large hexagonal plate, and without bj"^ a small triangular plate. Lower 

 interbrachial space fllled by three transverse rows of irregular ])lates. Genital 

 scales long and narrow, and composed of several pieces. Two short, stout, 



