1913.] Clark, Echinoderms from Lower California. 213 



Station 5676. Off San Juanico, west coast of Lower California, 647 fms. 

 Bottom Temp., 39. 



Station 5682. Off Cape St. Lucas, Lower California, 491 fms. Bottom 

 Temp., 40.8. 



Fourteen specimens. 



Ophiomusium glabrum. 



Liitken and Mortensen, 1899. Mem. M. C. Z., Vol. 23, p. 132. 

 Ophiomusium multispinum H. L. CLARK, 1911. Bull. U. S. Nat. Mus., No. 

 75, p. 113. 



This is one of the commonest deep water ophiurans of the western 

 Pacific, ranging from the equator to 47 N. lat. in water from 480 to 2232 

 fms. deep. The largest specimen in the present collection has the disk 

 35 mm. across and comparison of this individual with a cotype of multi- 

 spinum shows that the latter is, as I suspected when describing it, identical 

 with glabrum. The differences pointed out are individual and not specific, 

 proving to be quite inconstant. 



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

 1090 fms. 



Station 5684. Southwest from Magdalena Bay, west coast of Lower 

 California, 1760 fms. 



Station 5686. Off Ballenas Bay, west coast of Lower California, 

 930 fms. Bottom Temp., 37.3. 



Station 5687. Off Pt. Santa Eugenia, west coast of Lower California, 

 480 fms. Bottom Temp., 41.1. 



Station 5689. Off Rosario Bay, west coast of Low r er California, 879 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. 



Bathymetrical range, 480-1760 fms. Temperature range, 41.1-37.2. 



Seventy specimens. 



Ophiomusium lymani. 



Wyville Thomson, 1873. The Depths of the Sea, p. 172. 



This, the commonest and most widespread of deep-sea ophiurans, is 

 represented by a large and uninteresting series of specimens, whose disk- 

 diameters range from 2| to 30 mm. 



