1913.] Clark, Echinoderms from Lower California. 199 



Station 5697. Off Monterey County, California, 485 fms. Bottom 

 Temp., 39.8. 



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, 440-659 fms. Temperature range, 39.9-37.9. 



Nineteen specimens. 



Zoroaster ophiurus. 



Fisher, 1905. Bull. Bur. Fish., Vol. 24, p. 315. 



This seems to be a more southern species than the preceding, occurring 

 along the coast of Lower California in eight to eleven hundred fathoms. 

 The specimens before me range from R = 25 mm. to R = 160 mm.. The 

 latter are thus larger than the type. In the small specimens, the spines on 

 the primary plates of the disk and on the radial series of each ray are very 

 conspicuous, 1-2 mm. long. In half grown specimens they are apparently 

 no larger and hence are no longer conspicuous. In the little specimens, 

 there are only two or three series of actino-lateral plates at the base of the 

 ray. 



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. 



Six specimens. 



Zoroaster platyacanthus 1 sp. nov. 

 Plate XLIV, Figs. 1 and 2. 



Rays 5. R = 67 mm.; r = 9J mm. R = 7r. Breadth of ray at base, 10 mm. 



Disk rather convex (concave at center in type) ; rays moderately long, more or 

 less flattened not attenuate; median radial ridge not prominent ; spines and spine- 

 lets not very numerous, rather stout, rough-tipped; abactinal pedicellarise not very 

 conspicuous. 



Abactinal skeleton rather heavy; primary plates of disk not specially conspicu- 



flat wide + aKavda. = prickle, spine. 



