1913.] Clark, Echinoderms from Lower California. 205 



Station 5673. Off Pt. San Tomas, west coast of Lower California, 

 1090 fms. 



Station 5690. Off Rosario Bay, west coast of Lower California, 1101 

 fms. Bottom Temp., 38.1°. 



Station 5691. Off Pt. San Tomas, west coast of Lower California, 

 868 fms. Bottom Temp., 37.2°. 



Six specimens. 



OPHIUROIDEA. 



Ophioderma panamensis. 

 Lutken, 1859. Add. ad Hist., pt. 2, p. 91. 



This species is evidently common in the Gulf of California, as a large 

 series was brought home by the 'Albatross.' The largest are about twenty 

 millimeters across the disk. Young individuals have the arms quite 

 distinctly banded, but in large specimens, the bands seem to be confined to 

 the tips of the arms. 



Pichilingue Bay, east coast of Lower California. 



San Francisquito Bay, east coast of Lower California. 



Sixty-one specimens. 



Ophioderma variegata. 



Lutken, 1856. Vid. Med., p. 21. 



The most highly colored animal in the whole collection is one of the 

 representatives of this tropical species. The disk is bright green, the arms 

 are banded with green and grayish-green, and the base of each arm with 

 the adjoining portion of the disk is bright rose-red. In two specimens, the 

 disk is dull yellowish-brown. The largest individual is 10 mm. across the 

 disk. McClendon (1909, Univ. Cala. Publ. Zool., Vol. 6, no. 3) does not 

 include this species in his list of ophiurans from the San Diego region and 

 it is quite possible that it does not occur on the west coast of Lower Cali- 

 fornia. 



"Lower California." 



Agua Verde Bay, east coast of Lower California. 



Four specimens. 



