222 , ART. 2. — H. MATSUMOÏO : 



The sublittora] form approaches 0. koreana more closely than 

 the littoral form. It is also somewhat probable that, the present 

 species may prove to be an extreme variety of 0. koreana, as 

 suspected by Claek. 



Ophiothrix niacrohrachia Clark. 



Ophiothix macrohracJda : Clark, Bull. U. S. Nat. Mus., LXXV, 1911, 

 p. 267, %. 133. 



Numerous specimens ; Off Nii-jima, Sagaini Sea. Numerous 

 specimens ; Okinosé, a submarine bank, Sagami Sea. One speci- 

 men ; off Joga- shima, Sagami Sea; 75 fathoms. Four specimens; 

 Uraga Channel. 



Suruga Gulf; 34-131 fathoms (Clakk). Bungo Channel; 65 

 fathoms (C].aek). Korea Strait; 59 fathoms (Claek). Eastern 

 Sea ; 05-135 fathoms (Claek). 



In my specimens, the arms are somewhat shorter than in 

 Claek's type. For example, one specimen lias the disk diameter 

 of 10 mm. and an arm length of 115 mm. Some specimens bear 

 one or several individuals of a species of parasitic gastropods, 

 Sty lifer or its allies. The parasites are attached to the host at 

 the genital slits, as figured by Kœhlee in Opliiothrix crassispina 

 Kœhlee, 1904. The shell of the parasites is almost white or 

 light pink in alcohol. 



OphiotUrioc eustelra Clark. 



Opliiothrix eusteira : Clark, Bull. U. S. Nat. Mus., LXXX, 1911, p. 

 265, fig. 132. 



Two specimens ; Pinnacle Is. Three specimens ; off Jogashima, 

 Sagami Sea; 75 fathoms. Numerous specimens; off Misaki, 



