1913.] Clark, Echinodcrms from Lower California. 233 



Benthodytes sanguinolenta. 



Theel, 1882. 'Challenger' Holoth.: Pt. I, p. 104. 



Although this species was met with at several stations, and special 

 efforts were evidently made to preserve some good specimens, the material 

 is all in poor condition. The individuals range in length from about 60 

 to nearly 250 mm. Ludwig is undoubtedly correct in saying that the 

 absence of calcareous deposits is not accidental but is the normal condition 

 for the species. 



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

 1090 mm. 



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

 California, 1760 fms. 



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

 fms. Bottom Temp., 38.1°. 



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

 1076 fms. Bottom Temp., 37.1°. 



Bathymetrical range, 1076-1760 fms. Temperature range 38.1°-37.1°. 



Seventeen specimens. 



Pseudostichopus mollis. 



Theel, 1886. 'Challenger' Holoth.: Pt. II, p. 169. 



While it is possible that this large series contains more than a single 

 species, the absence of calcareous deposits and of conspicuous ambulacral 

 appendages makes it impracticable to distinguish more than one. Some 

 of the small specimens have the body-wall very thin, but most of the adults 

 have a thick and firm perisome. The largest specimens are 150-160 mm. 

 long. The natural color is creamy white, but more or less fine sand adheres 

 to the skin and in some cases, wholly conceals the ground color. 



Station 5689. Off Rosario Bay, west coast of Lower California, 879 fms. 



Station 5690. Off Rosario Bay, west coast of Lower California, 1 101 fms. 

 Bottom Temp., 38.1°. 



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

 868 fms. Bottom Temp., 37.2°. 



Station 5693. Northwest of San Nicolas Island, California, 451 fms. 



Station 5695. Southwest of Santa Rosa Island, California, 534 fms. 

 Bottom Temp., 38.9°. 



Bathymetrical range, 451-1101 fms. Temperature range 38.9°-37.2°. 

 Forty-eight specimens. 



