172 



ART. 2. — H. MATSUMOTO 



Fig. 43. Amph'ioplus ancistrotus. a. From 

 above, x 8. h. From below, x 8. c. Ventral 

 view of an oral angle, x 16. d. Arm spines 

 of one side of an arm joint near disk, x 16. 



angle, there are usually four 

 oral papillœ, of which the outer- 

 most one arises from the adorai 

 shield ; besides, there occurs an 

 additional papilla, placed above 

 the level of the ordinary papilla?, 

 but visible from below just 

 between the infradental and the 

 next papilla. In some speci- 

 mens, there are five ordinary 

 and one additional papillœ, of 

 which the outermost two arise 

 from the adorai shield (fig. c). 

 Thus, the mouth parts of the 

 present species present the 

 characters of Amphioplus, and 

 not of Amphiodia. 



p. 70. 



Atnxiliioplus JtexacanfJitis Clakk. 



AmpMoplus hexacanthus : Clark, Bull. Ü. S. Nrat. Mus., LXXV, 1911, 

 I. 



Uraga Channel ; 88 fathoms (Clark). 

 Off California ; 50 fathoms (Claek). 



Amx^Jnoplus cernuus (Lyman). 



Ampldura cernua : Lyman, Bull. Mus, Comp. Zool., YI, Ft '2, 1879, p. 

 28, PI. Xn, figs. 323-325; Lyman, Hep. Challenger, Y, 1882. P. 138, PI. 

 XYn, figs. 13-15. 



