12 THE VOYAGE OF H.M.S. CHALLENGER. 



Ophiopeza yolclii (?), Ltk., Vid. Meddel., Jan. 1856, p. 9; Addit. ad Hist., part 2, 

 p. 98, 1859 ; L}Tn., Bull. Mus. Comp. Zool., vol. iii., part 10, p. 221. 

 Ophiopmmnmis Yoldii, Ltk., AdJit. ad Hist., part 3, p. 98, 1869. 



Station 163.— AprU 4, 1874; oflf Twofold Bay; lat. 36° 56' S., long. 150° 30' E.; 

 120 fathoms ; red clay. 



Oj^hiopeza aster, Lpii. (PI. XXI. figs. 16-18). 



Ophiopeza aster, Ljm., Bull. Mus. Comp. Zool, vol. vi., pt. 2, p. 50, pi. xiv! figs. 395-397, 1877. 



Disk densely and finely granulated above and below, including the mouth angle. 



(Type specimen from Station 142.) Diameter of disk 11 mm.; length of arm 33 mm. 

 Width of arm close to disk, 2 mm. Teeth narrow, sharp, and lanceolate ; the two lowest 

 usually split in two. The apex is occupied by a bunch of three or four short, crowded, 

 spiniform tooth papillse ; and on each side of the mouth angle is a close line of small 

 mouth papiUse whereof the inner ones are bead-like, while the two outermost are wider and 

 somewhat flattened. Tlie small, rounded mouth shields and the side mouth shields are 

 completely covered by a close granulation. First under arm plate about half as large as 

 those l)eyond, of a heart shape, with the point inward ; the rest arc rather small, some- 

 what broader than long, much wider without than within, having the outer side curved, 

 lateral sides re-enteringly curved and a truncated angle within. Side arm plates small, 

 cUnging close to arm, widely separated above, nearly meeting below. Upper arm plates 

 four sided, twice as broad as long, much wider without than within, with outer side 

 gently curved and laterals straight. Disk pentagonal, flat, densely and uuiforml}- 

 covered with an extremely fine granulation,^20 or 25 grains in the length of 1 mm. ; this 

 granulation extends over the entire mouth angle quite to the bases of the mouth papillae. 

 Six very short arm spines, growing longer from above downward ; the upper ones are 

 rounded and peg-like ; the lowest ones somewhat flattened, and scarcely more than half 

 as long as a joint. One oval tentacle scale. Colour in alcohol, light greenish grey. 



Station 142.— December 18, 1873 ; lat. 35° 4' S., long. 18° 37' E. ; 150 fothoms ; sand. 



Oj^hiopeza cequalis, Lym. (PI. XXVII. figs. 7-9). 



Opliiopjeza cequalis, Lym., Anniv. Mem. Best. Sue. Nat. Hist., Nov. 1880, pi. ii. figs. 23-25. 



Disk uniformly covered, including radial shields, liy a close granulation. Ten flat 

 crowded arm spines nearly equal, except the lowest, which is larger. 



(Type specimen from Station 219.) Diameter of disk 25 mm. Length of arm about 

 150 mm. ; width of same, close to disk, without spines, 5 mm. Fourteen to seventeen 

 flattened, crowded mouth papillaj to each angle; those within small and pointed; the two 

 outermost on either side much the broadest. Mouth shield short, rounded, heart-shaped, 

 with a blunt angle inward. Length to breadth, 4 : 4. Side mouth shields very small, 



