1913.] Clark, Echinoderms from Lower California. 229 



Station 5692. Off Pt. San Tomas, west coast of Lower California, 

 1076 fms. Bottom Temp., 37.1°. 

 Three specimens. 



Caudina californica. 

 Ludwig, 1894. Mem. M. C. Z., Vol. 17, p. 155. 



These specimens are small, 70 mm. long of which about half is tail, but 

 their identity is unmistakable. 



Station 5698. Off Monterey County, California, 475 fms. Bottom 

 Temp., 39.9°. 



Station 5699. Southwest from Monterey Bay, California, 659 fms. 

 Bottom temp., 37.9°. 



Two specimens. 



Cucumaria abyssorum. 



ThSel, 1886. "Challenger" Holoth.: Pt. II, p. 66. 



This species is represented in the collection by a good series, ranging 

 from 30 to 80 mm. in length, but showing no noteworthy peculiarities. 



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

 868 fms. Bottom Temp., 37.2°. 



Station 5692. Off Pt. San Tomas, west coast of Lower California, 

 1076 fms. Bottom Temp., 37.1°. 



Bathymetrical range, 868-1760 fms. Temperature range, 37.2°-37.1°. 



Twenty -nine specimens. 



Sphaerothuria bitentaculata. 

 Ludwig, 1894. Mem. M. C Z. ( Vol. 17, p. 141. 



This remarkable species, so fully described and discussed by Ludwig, is 

 represented by some specimens about 16 mm. long. The shallowness of the 

 water and the high bottom temperature at the spot where they were taken 

 is notable. 



