1913.] Clark, Echinodcnns from Lower California. 191 



Pectinaster agassizii. 



Cheiraster agassizii Ludwig, 1905. Mem. M. C. Z., Vol. 32, p. 1. 



Pectinaster agassizii Ludwig, 1910. Sitz. K. Preuss. Akad. Wiss., Vol. 23, p. 449. 



These specimens appear to be typical agassizii as they have few papulre 

 in each papularium and no abactinal or marginal pedicellarift, while acti- 

 nally pedicellarise are very common. Even the specimens from Station 

 5693, which are in very poor condition, seem to be no nearer the subspecies 

 evoplus. The range of typical agassizii is thus extended considerably 

 northward. 



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

 1090 fms. 



Station 5674. Off Pt. San Tomas, west coast of Lower California, 

 590 fms. Bottom Temp., 39.4°. 



Station 5686. Off Ballenas Bay, west coast of Lower California, 930 

 fms. Bottom Temp., 37.3°. 



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



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



Bathymetrical range, 451-1101 fms. Temperature range, 39.4°-37.1°. 



Ninety-six specimens; one perfectly tetramerous. 



Nearchaster aciculosus. 



Acantharchaster aciculosus Fisher, 1910. Zool. Anz., Vol. 35, p. 550. 

 Nearchaster aciculosus Fisher, 1911. Ann. Mag. Nat. Hist. (8), Vol. 7, p. 92. 



The specimens in which R exceeds 100 mm. have actinal intermediate 

 pedicellaria 3 present and there are also a very few inferomarginal pedicel- 

 larise to be seen. But the smaller specimens do not have actinal pedicel- 

 larise anywhere. It seems probable that this difference if it is anything 

 more than individual diversity, is due to age and not, as Fisher suggests, to 

 locality. The largest specimen in this collection has R in excess of 160 mm. 

 but the tips of all the arms are missing. 



Station 5688. Off Cedros Island, west coast of Lower California, 525 

 fms. Bottom Temp., 39.9°. 



