REPOET ON THE OPHIUROIDEA. 105 



Ophiopyren brevispimis, Lym, (PI. XII. figs. 1-3). 



Ophiopyren Irevispinus, Lym., Bull Mus. ComiJ. Zool., vol. v., part 7, p. 133, pi. vii. figs. 

 173-175, 1878. 



Three very short, blunt arm spines. Mouth shields longer than broad, pentagonal. 



(Type specimen from Station 173.) Diameter of disk 3 '8 mm. Width of arm with- 

 out spines 1 mm. Thirteen or fourteen mouth papillge to each angle, of which the outer 

 one on each side is much the largest, and the rest are short and square, except the one at 

 the apex, which is more pointed. Mouth shields longer than broad, pentagonal, with long 

 pointed angle within ; length to breadth '8 : "5. Side mouth shields squarish and very 

 short, widely separated by inner angle of mouth shield. First under arm plate much 

 broader than long, of an irregular oval form ; second plate as long as broad, pentagonal, 

 with a blunt angle inward ; third plate similar, but with a sharper angle within ; those 

 beyond grow proportionately longer, and become gradually wedge-shape, with a truncated 

 angle inward. Each plate is apparently divided in two parts, the inner one more or less 

 diamond-shaped, the outer made up of the remainder of the plate. Upper arm plates 

 four-sided, somewhat wider without than within, lateral sides straight, outer side slightly 

 curved. Side arm plates not swollen, meeting neither above nor below. Disk flat and 

 round, covered above and below with minute granules, about a dozen in the length of a 

 millimetre. In lower interbrachial space on the side mouth shield next the genital opening 

 are three minute grain-like papillae. Eadial shields small, partially covered by granulation, 

 closely joined and 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, Ijluut, pointed arm spines, arranged evenly along 

 the outer edge of the side arm plate. Colour in alcohol, white. 



Station 173.— July 24, 1874 ; ofi" Matuka Bay, Fiji ; lat. 19° 10' S., long. 179° 40' E. ; 

 300 fethoms ; coral. 



Ophiopyren longispinus, Lym. (PI. XII. figs. 4-6 ; PI. XXXIX. figs. 4-6). 



Ophiopyren longispinus, Lym., Bull. Mus. Comp. Zool., vol. v., part 7, p. 134, pi. viL figs. 

 176-178, 1878. 



Three slender arm spines, as long as an arm joint. Mouth shields wide, heart-shaped, 

 broader than long. 



(Type specimen from Station 33.) Diameter of disk 4*5 mm. Width of arm, with- 

 out spines, close to disk 1 mm. Fifteen or sixteen mouth papillae 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- 



