322 ART. 2. — H. MATSUMOTO .* 



differs from it in the coarser disk granules, in the smaller naked 

 part of the radial shields, in the more strongly ridged dorsal arm 

 plates, in the "much lower lateral arm plates, in the ventral arm 

 plates being wider than long and angled inwards as well as 

 outwards, and in the arm spines being much shorter than the 

 corresponding arm joints. 



I*ectinura anchista Clark. 



Fectinura anchista : Clark, Bull. U. S. Nat. Mus,, LXXV, 191 1, p. 

 23, fig. 1. 



Numerous specimens ; off Misaki, Sagami Sea. One specimen ; 

 off Uki-shima ; 300 fathoms. 



Off Suno Saki, Sagami Sea ; 49 fathoms (Clark). Kagoshima 

 Bay ; 85 fathoms (Clark). Eastern Sea ; 95-139 fathoms (Clark). 



This species strongly resembles P. cylindrica (Hutton), and it 

 is somewhat doubtful whether the two are really distinct. As to 

 the proportion of the arm length to the disk diameter, the dif- 

 ference pointed out by Clark has, in my opinion, no significance ; 

 for the specimens in my hands have proportionately shorter arms. 

 One specimen is 9 mm, in the disk diameter and 30 mm, in the 

 arm length, while another specimen is 8 mm. in the disk diameter 

 and 33 mm. in the arm length. The colour seems to change in 

 alcohol with time from purple to pink. 



Key to Japanese species of Ojyfiiarachnella. 



A — No trio of naked disk plates just outside and between each pair of 



radial shields ; oral shields longer than wide yorgonwt. 



AA — A trio of naked disk plates present just outside and between each 

 pair of radial shiekls, on the dorsal side of the arm base. 



