344 



A1£'J\ 2, — II. MATSUMOTO : 



p. 325 ; Clauk, Bnll. Mus. Comp. Zool., LI, 1908, p. 296 ; (Jlaiîk, Bull. U. 

 S. Niit. Mus., LXXV, 1911, p. 250. 



Throe specimens ; Natsui, Iliuga. One specimen ; Okinawa. 

 One specimen ; Yayeyama, Riu-kiu. Three specimens ; Koshun, 

 Formosa. Tln^ee specimens ; locality unknown. 



Indo-Paciflc. Natsui appears to be the northern limit of this 

 species for the present. 



The colour in alcohol is very variable. In some specimens, 

 the disk is dark grayish brown and sparsely spotted with black. 

 In others, tlie disk is light bluish green and variegated with white. 

 The oral shields are nearly oval in some specimens, but more or 

 loss oblong quadrangular in others. 'l'Ile disk granules are very 

 lino and close-set. The granules occur also on tlie abradial end 



Fig. 9S. Oplàocoma hrevipeN. xd. u. From above. I>. From below. 

 c. Side view of three urm joints near disk. 



of the adorai shields and of the first lateral arm plates. The 

 oral })apilloo are comparatively numerous and number five or six on 

 either side. The dorsal brachial margins of the disk are concave. 

 The dorsal arm plates are wide and have clearly cut outer 

 borders. The arm spines are shorter dorsally than ventrally. A 

 few of the lower dental papillaa are very rudimentary and granule- 

 like, reminding us of the granules of the oral angles of tho 



