134 BULLETIN OF THE 
covered above and below with minute granules, about a dozen in the length 
of a mm. In lower interbrachial space on the side mouth-shield next the 
genital opening are three minute grain-like papille. Radial shields small, 
partially covered by granulation, closely joined, much rounded within ; just 
outside them is a row of large granules. Genital opening long, extending from 
side of mouth-shield to edge of disk ; genital scale hidden by granulation. Two 
short round tentacle-scales on the second under arm-plate ; beyond, only one. 
Three very short, blunt, pointed arm-spines, arranged evenly along the outer 
edge of the side arm-plate. Color in alcohol, white. 
Station 173, off Matuka Bay, Fiji, 300 fathoms, 1 specimen. 
Ophiopyren longispinus sp. nov. 
Plate VII. Figs. 176 - 178. 
Special Marks. — Three slender arm-spines, as long as an arm-joint. Mouth- 
shields wide heart-shape, broader than long. 
Description of an Individual * (Station 33). — Diameter of disk 4.5 mm. 
Width of arm, without spines, close to disk 1 mm. Fifteen or sixteen mouth- 
papilla to each angle, of which the outer one, on either side, stands on the side 
mouth-shield, is larger than and separated from the others, and is sharp and 
curved ; the rest are small, squarish, and close, except the one at the apex, 
which is sharp and longer. Mouth-shields broader than long, three-sided, outer 
edge straight, lateral corners much rounded, and an angle inward ; length to 
breadth .8:1. Side mouth-shields squarish and large, widely separated by 
mouth-shields, similar in form and position to the side arm-plates beyond. 
First under arm-plate small triangular, with an acute angle inward, and outer 
edge slightly curved ; second plate four-sided, wider without than within ; 
third plate as long as broad, much wider without than within, having outer 
corners rounded. All the plates are apparently composed of two pieces, — an 
inner, which has a sharp angle outward, and an outer, which comprises the rest 
of the plate. Side arm-plates broad, not swollen, meeting neither aboye nor 
below. Upper arm-plates wider without than within, considerably arched, and 
with outer corners prolonged in small peaks. Disk round and thick, covered 
above and below with very minute granulation, 15 or 20 grains in the length 
ofa mm. Radial shields small, of a rounded pear-seed shape, nearly or quite 
joined, and to be seen only when the granulation has been removed, Genital 
openings extending from outer edge of mouth-shield to margin of disk. Geni- 
tal scales hidden by the skin and granulation. On the interbrachial edge of the 
side mouth-shields are four short rounded papilla. Three long, very delicate, 
pointed arm-spines, the middle one a little the longest, upper and under spine 
of about the same size, and about as long as an arm-joint. One long pointed 
tentacle-scale on each of the first pair of tentacle-pores; beyond there are two, 
* The description is from a specimen larger than the one figured. 
