1913.] Clark, Echinoderms from Lower California. 219 



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

 Bathymetrical range, 451-1101 fms. Temperature range, 38.1°-37.1°. 

 Twenty -one specimens. 



Asteronyx excavata. 

 Liitken and Mortensen, 1899. Mem. M. C. Z., Vol. 23, p. 185. 



This species seems to be confined to the region of southern Lower 

 California and the Tres Marias Islands. It was found in the latter area 

 by the 'Albatross' in 1891. It is a well characterized, and apparently rare 

 species. The largest specimen in the present collection is 26 mm. across 

 the disk, or about one third larger than the specimen described by Liitken 

 and Mortensen. 



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

 Temp., 40.8°. 



Station 5688. Off Cedros Island, west coast of Lower California, 

 525 fms. Bottom Temp., 39.9°. 



Five specimens. 



Asteronyx loveni. 



Muller and Troschel, 1842. Sys. Ast., p. 119. 



Except for the large lot (79) of 3 r oung specimens taken at Station 5675, 

 this well known species was not common, but was taken only three times 

 and then off the coast of California. The largest specimens from Station 

 5675 are only 16 mm. across the disk and while I fail to find any good 

 reason for not calling them loveni, I confess to being suspicious of them. 

 They are certainly not either plana, dispar or excavata and comparison 

 with young loveni from off British Columbia and Alaska has made me feel 

 they should be called loveni. If some adult loveni had been taken at the 

 same or some neighboring station, I should be better satisfied with my 

 decision. 



Station 5675. Southwest of San Cristobal Bay, west coast of Lower 

 California, 284 fms. Bottom Temp., 44.6°. 



Station 5694. Southwest of Santa Cruz Island, California, 640 fms. 



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°. 



Bathymetrical range, 284-659 fms. Temperature range, 44. 



Eighty-two specimens. 



