OPHIUKANS OF THE PHILIPPINE AND ADJACENT WATEKS. 233 



well as by the upper arm plates showing very sharp lateral angles, 

 but the covering of the dorsal surface of the disk between the radial 

 shields consists of a mixture of rather well-developed and strongly 

 echinulated true spines and club spines; furthermore, the radial 

 shields are more elongated, and the upper arm plates are of different 

 shape, for they are relatively longer and less broad, and their distal 

 border is more rounded in 0. expedita. These differences may be 

 appreciated on the photographs which I give here of 0. expedita 

 (pi. 31, fig. 6, and pi. 33, fig. 5) and of 0. longipeda (pi. 31, figs. 3, 4 T 

 and pi. 33, figs. 9, 10), and they are entirely independent of the 

 characters taken from the coloration. 



As for 0. puncto-limbata, in which the form of the radial shields 

 recalls that which is found in O. expedita, the dimensions of the 

 specimens are always rather small, and they never attain the size 

 which we know in O. expedita or in its variety O. rhabdoid. The 

 dorsal surface of the disk bears club spines only, which are some- 

 times a little elongated, but there are no true spines as in 0. expedita; 

 the arm spines are much weaker, shorter, and less strongly echinu- 

 lated, and the lateral angles of the upper arm plates are less sharp. 

 The general color of O. puncto-limbata is a somewhat light violet, or 

 rather light blue, and the surface of the arms never shows light and 

 dark longitudinal lines. Furthermore, in O. puncto-limbata I have 

 never observed spines properly so called among the club spines of the 

 dorsal surface of the disk such as are seen in O. expedita. 



OPHIOTHRIX GALATHEAE Lutkcn. 



Plate 33, fig. 11 ; plate 34, figs. 1-4; plate 99, fig. 1. 

 See for bibliography : 



Ophiothrix galatheae Kcehleb ('05), p. 84; ('05b), p. 458; ('07), p. 333 p 

 ('10), p. 294; ('15), p. 272. 



Localities. — Dumurug Point, Masbate ; April 19, 1908. 

 One specimen (Cat. No. E. 306, U.S.N.M.). 

 Maricaban Island, Balayan Bay, Luzon. 

 One specimen (Cat. No. E. 307, U.S.N.M.). 

 Makasser Island ; tide pools. 

 One specimen (Cat. No. E. 364, U.S.N.M.). 

 Nasugbu Reef. 



One specimen (Cat. No. E. 339, U.S.N.M.). 

 Port Palapag; June 3, 1909. 

 One specimen (Cat. No. E. 305, U.S.N.M.). 

 Philippines. 



Three specimens (Cat. No. E. 337, U.S.N.M.). 

 Notes. — On plate 34, figures 1, 2, I show two specimens from 

 Dumurug Point in which the radial shields bear a few scattered 



