REPORT ON THE ECHINOIDEA MORTENSEN 299 



The primary spines have numerous narrow red bands which are 

 separated by broader whitish or greenish bands. The red color 

 almost disappears on the adoral side of the spine, which is nearly 

 white. The secondary spines are whitish, with a more or less con- 

 spicuous greenish brown median stripe. The naked test is whitish, 

 the upper side darker. The genital plates and the periproct are 

 rather dark, greenish brown, against which color the white oculars 

 stand out very markedly (pi. 64, fig. 2). The greenish-brown 

 color continues more or less on to the interambulacra; the primary 

 tubercles are grayish green. From the outer edge of the oculars, 

 which is also greenish brown, this color continues along the series of 

 marginal ambulacral tubercles and the adjoining part of the pore 

 zone almost to the oral side of the test. The interporiferous zone of 

 the ambulacra is otherwise white, or at least whitish. 



Notes. — The intestine of a specimen opened was completely empty 

 thus giving no information in regard to the food. The small size of 

 the female genital openings and of the eggs, which are about 0.1 mm. 

 in diameter, indicate that the species has probably a pelagic larva. 

 The spines are rather heavily overgrown by bryozoans and barnacles, 

 mainly Scalpellum. Some of the primaries carry at the outer end a 

 conspicuous tuft of a peculiar ctenostomatous bryozoan, with a small 

 head on a long simple stalk. These tufts are usually confined to the 

 adoral side of the spine and hang downward. 



Remarks. — This species, so very well characterized through its 

 peculiar large flat areoles, its long banded spines, and its unusually 

 slender secondary spines, besides the characteristic coloration, is not 

 very closely related to any other known species of Stylocidaris ; the 

 nearest relationships would seem to be with S. reini, but it is not 

 very near that form. All the specimens at hand are remarkably uni- 

 form in their main characters. 



Genus STEREOCIDARIS Pomel 



STEREOCIDARIS GRANDIS Doderlein 



Stereocidaris grandis Doderlein, Die japanischen Seeigel, I, Familien Cida- 

 ridae und Saleniidae, 1887, p. 3, pi. 1, figs. 1-6; pi. 2, figs. 1-11; pi. 8, 

 figs. 2, a-m.— de Meijere, Die Echinoidea der Siboga-Exped., 1904, p. 

 17. — A. Agassiz and H. L. Clark, Mem. Mus. Comp. Zool., vol. 34, No. 

 1, 1907, p. 22, pi. 5, figs. 18-20, pis. 33, 36.— H. L. Clark, Bull. Mus. 

 . Comp. Zool., vol. 51, No. 7, 1907, p. 220; Cat. Recent Sea-urchins Brit. 

 Mus., 1925, p. 26. 



Localities. — Station 5281; China Sea, in the vicinity of southern 

 Luzon; Malavatuan Island (N.) bearing S. 84° W., 4.3 miles distant 

 (lat. 13° 52' 45" N., long. 120° 25' 00" E.); 367 meters; bottom tem- 

 perature 10.22° C.j dark gray sand; July 18, 1908 (1 specimen, Cat. 

 No.E. 1303, U.S.N.M.). 



