OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 137 



believe myself justified in uniting my species with 0. ~bythiaspis, 

 from which, moreover, it differs in the other ways I have just indi- 

 cated. 



In O. plicata, Lyman has also shown a group of granules between 

 the last and the penultimate mouth papillae ('79, fig. 233), but4hese 

 granules possibly do not occur in the adult ; at least, Lyman does not 

 mention them and has not shown them in his figure in the Challenger 

 report ('82, pi. 10, fig. 7) ; in any case, 0. globc/ita can not be confused 

 with O. plicata. 



I shall have occasion further on to describe in 0. pulchra the 

 presence of a small group of granules identical with those of which 

 I have just spoken, and which replace the penultimate mouth papilla. 

 But O. glolata differs from O. pulchra in the armature of the dorsal 

 plates of the disk, which is entirely different, in the very much 

 smaller 4 and always separated radial shields, in the also smaller 

 mouth shields, which are broader than long and without the distal 

 lobe always developed in O. puchra, and which projects strongly into 

 the interradial space ; furthermore, the under arm plates are widely 

 separated, the arm spines are longer, etc. 



I shall give further on the characters separating O. globata from 

 O. hastata, which I am describing below. 



OPHIOPLINTHACA HASTATA, new species. 



Plate 18, figs. 6, 7, and 8 ; plate 94, fig. 7. 



Localities. Albatross station 5281; China Sea, in the vicinity ol 

 southern Luzon; Malavatuan Island (N.) bearing S. 84 W., 7.97 

 kilometers (4.3 miles) distant (lat. 13 52' 45" N., long. 120 25' 00" 

 E.; 368 meters (201 fathoms) ; July 18, 1908; dk. gy. S. 



One specimen (Cat. No. 41003, U.S.N.M.). 



Albatross station 5586; Sibuko Bay, Borneo, and vicinity; Sipa- 

 dan Island (M.) bearing W., 17.42 kilometers (9.4 miles) dis- 

 tant (lat. 4 06' 50" N 7 ., long. 118 47' 20" E.; 635 meters (347 

 fathoms) ; September 28, 1909; gy. M. 



One specimen (Cat. No. 41002 U.S.N.M.). 



Description. I shall describe this species from the specimen from 

 station 5586, in which the diameter of the disk is 7 mm. and the 

 arms are about 30 mm. long, only two being preserved entire. 



The disk is rounded. In the interradial spaces it shows very 

 marked incisions, which, however, are a little less deep than in the ma- 

 jority of the other species of the genus Ophioplinthaca. 



The dorsal surface is covered with rather large imbricated plates, 

 each surrounded by a fairly regular border of very much smaller 

 plates. Along the radial incisions there is a row of distinct plates, 

 but these are not larger than the others. Each of the large plates 



