MONOGRAPH OF JAPANESE OPHIUKOIDEA. 19 



except in the disk. The lateral arm plates do not however meet 

 each other in the ventral median line, so that there is left here a 

 naked, depressed space, which is especially well marked near the 

 extremity of the arm. Two arm spines, subventral, miequal, 

 glassy, all converted into compound hooks, with a series of hook- 

 lets along their ventral side, covered by a thin, transparent mem- 

 brane ; the lower one is much larger than the other. In some 

 basal joints, there occurs on the lateral arm plates one more 

 spine, which is placed on the dorsal margin of the plate and also 

 bears a series of booklets on one side ; it is larger than the other 

 two, and nearly as long as the corresponding arm joint. No 

 tentacle scale. 



Colour in alcohol yellowish white. 



Ophiomyxa aiistralis Lütken. 



OpJdomyxa austrcdis : Lütken, Addit. ad Hist. Oph., IH, 1869, p. 45 

 & 99 ; Lyman, Kep. Challenger, V, 1882, p. 246 ; Lyman, Bull. Mus. Comp. 

 Zool., X, 1883, p. 274; Brock, Zeitschr. wiss. ZooL, XLVII, 1888, p. 

 532; Kœhler, BuU. Sei. Fr. Belg., XXXI, 1898, p. 123; Kœhler, Ibid., 

 XLI, 1907, p. 341 ; Clark, Mem. Austral. Mus., IV, 1909, p. 547 ; Clark, 

 Bull. U. S. Nat. Mus., LXXY, 1911, p. 271. 



Four specimens ; Mera-out-Oisegaké, Sagami Sea ; 300 fathoms. 



Oflf Suno Saki, Sagami Sea ; 41-50 fathoms (Clakk). Korea 

 Strait ; 59 fathoms (Claek). Eastern Sea ; 95 fathoms (Clark). 



Amboina ; 100 fathoms (Lïman). Sulu Sea ; 82-102 fathoms 

 (Ly^ian). Tongatabu Is. ; 18-240 fathoms (Lyman). Near Fiji Is. ; 

 310-315 fathoms (LYikiAN). Southern Australia and Bass Strait; 

 38-120 fathoms (Lütken, Lyman, Claek). New Zealand (Kœhlee). 



My specimens are all small, the largest being 7 mm. across 



