CLYPEASTER AUDOUINI. 29 



less reddish purple, which is probably nearly the color in life. While this species 

 resembles ravenelii in form, it is not so heavy and the test-margin is very much 

 thinner. Moreover the petals are very different, so that the two species cannot 

 be confused. 



The Albatross took europacificus at the following places : — 



Station 2795. Gulf of Panama, 7° 57' N., 78° 55' W. Bott. temp. 64.1°. 

 33 fms. Gy. s., bk. sp., brk. sh. 



Station 2813. Northwest of Hood Island, Galapagos, 1° 21' S., 89° 40' 15" 

 W. Bott. temp.? 40 fms. Co. s. 



Station 2829. Off Cape St. Lucas, L. Cal., 22° 52' N., 109° 55' W. Bott. 

 temp. 74.1°. 31 fms. Rky. 



Station 2995. Off Clarion Island, 18° 19' N., 116° 44' 15" W. Bott. 

 temp. 68.4°. 31 fms. Gy. s., brk. co. 



Station 3014. Gulf of California, 28° 28' N., 112° 04' 30" W. Bott. temp. 

 62.9° 29 fms. Gy. s. 



Station 3390. Off Cape Mala, Panama, 7° 26' 10" N., 79° 53' 50" W. Bott. 

 temp. 62.6°. 56 fms. Fne. gy. s., gr. 



Bathymetrical range, 29-56 fms. Extremes of temperature, 74.1°-62.6°. 



Fifteen specimens. 



Clypeaster audouini. 



Fourtau, 1904. Bull. Inst. Egypt, ser. 4, 4, p, 41S. 



Plates 122, fig. 10; 123, fig. 24. 



As Fourtau gives no details concerning spines and pedicellariae ; it may be 

 mentioned here that the primary spines are smooth and the miliaries have con- 

 spicuously club-shaped tips (PI. 122, fig. 10). Pedicellariae are exceedingly 

 scarce in the three specimens at hand. The single tridentate found had valves 

 .36 mm. long, shaped somewhat like those of rotundus (PI. 123, fig. 27) but with 

 the blade a trifle more angular on each side and not so evenly rounded. The 

 triphyllous had valves .09 mm. long and quite broad and flat (PI. 123, fig. 24). 

 This species is very well characterized. It appears to be distributed along the 

 whole East African coast for while Fourtau's specimens were from the Red Sea, 

 those of the M. C. Z. collection are from Natal. 



