MUSEUM OF COMPAKATIVE ZOOLOGY. 239 



Description of an Individual (Station 231).— Diameter of disk 6 mm. Width 

 of arm close to disk 1 mm. Three short, oblong, close-set papilla on each 

 side of mouth-angle, and at its apex a group of three smaller and bluntly 

 pointed ones, whereof the centre one is largest. Mouth-shield rounded quad- 

 rangular, with an angle inward ; length to breadth, 1:1. Side mouth-shields 

 rather short and narrow, running along inner angle of mouth-shield. First 

 under arm-plate large and triangular, with a curved outer side. The next 

 three plates wider than long, with a gently curved outer side, an obtuse angle 

 within, and re-entering curves on the sides. The plates beyond grow suddenly 

 smaller, and are much wider than long. Side arm-plates large and a little 

 swollen, meeting above and below. Upper arm-plates three-sided, with an 

 angle inward. Disk flat, and covered above in the centre by a group of six 

 large primary plates, whereof the middle one is pentagonal, and the rest 

 rounded. Outside these are two large elongated plates, placed end to end and 

 occupying the interbrachial space. The remaining upper surface is covered by 

 very large radial shields, which are as wide as long, and of irregular outline, 

 joined for their whole length, except at the inner point, where they are sepa- 

 rated by a small scale ; length to breadth, 1.2 : 1.3. The lower interbrachial 

 space is almost wholly occupied by a large hexagonal plate lying outside the 

 mouth-shield and the rather wide genital scales, which bear blunt, bead-like 

 papillai continued in an unbroken line over top of arm just along outer edge 

 of part of the radial shield. Three short, equal, stout, peg-like arm-spines, 

 about one third as long as a joint. First three tentacle-pores, with three 

 lumpy close-set scales on each side. The fourth has two scales on either side, 

 and those beyond have none. Color in alcohol, white. 



Station 231, off St. Vincent, 95 fathoms, 1 specimen. 



This specimen is probably not adult, but its characters are so marked that 

 there seems no doubt of its novelty. In the small number and large size of 

 its disk-plates, it resembles 0. minuta. 



Ophioglypha tenera sp. nov. 



Plate IV. Figs. 31-33. 



Special Marks. — Three short, blunt, spaced arm-spines, less than half as 

 long as a joint. Disk-scales somewhat swollen and mostly large. Radial 

 shields joined for a part of their length. Papillai of arm-comb close-set, flat, 

 and with rounded ends. 



Description of an Individual. — Diameter of disk 5.5 mm. Width of arm 

 1.2 mm. IMouth-angles large and regular, bearing on each side five or six low 

 papillaj, which are much crowded, and form a straight line ; the outermost are 

 much longer than high, while the inner ones are almost bead-like; at the apex 

 and on the jaw-plate are two spiniform papillae, between which appears the 

 lowest tooth. Mouth-shields five-sided, bounded within by a well-marked 

 angle, and without by a curve; length to breadth 1.2 : 1. Side mouth-shields 



