MONOGRAPH OF JAPANESE OPHIUllOIDEA. 103 



OpJdolinina lambda (Clark). 



OpMacantha lambda: Clakk, Bull. U. S. Nat. Mus., LXXY, 1911, p. 

 231, %. 108. 



Off Hiuga, southern Japan ; 437 fathoms (Claek). 



Key to Japanese species of Ophiomitrella, 



A — Radial shields wider than long ; four oral papillae, of which the 

 outermost one, arising from the first ventral arm plate, stretches 

 above the next papilla ; ventral arm plates not in contact with each 

 other ; seven or eight arm spines, of which the uppermost is the 



longest stellifera. 



AA — Radial shields about as wide as long ; six oral papillas on either 

 side ; ventral arm plates slightly in contact with each other ; nine 

 or ten arm spines, of which the uppermost and lowest are the 

 shortest , , , poh/acantjia. 



Oxthioniitvella stelliferaf sp. nov. 



Two specimens ; off Inatori, Izu. One specimen ; Locality 

 unknown. 



Diameter of disk 4 mm. Length of arms 20 mm. Width 

 of arms at base 0.8 mm. 



Disk almost circular but with a small indentation in each 

 interbrachial border, flat, covered with coarse, stout, partly 

 imbricated scales, which almost invariably bear each a large 

 stumpy tubercle with a six-rayed stelliform crown. Radial shields 

 very small, irregularly triangular, with much rounded inner 

 angle, a little larger than the disk scales, wider than long, sepa- 

 rated from each other. Tnterbrachial spaces below covered with a 

 few coarse, irregular, imbricated scales, without any stumpy 

 tubercles. Genital slits short. 



