REPORT ON THE ECHINOIDEA MORTENSEN 



301 



The specimen from station 5527 has the primaries somewhat thick- 

 ened above the collar, then tapering gradually to the rather fine point 

 which is not widened into a crown in those few that are intact; they 

 are of a faint pinkish tint. The specimen measures 30 mm. in hori- 

 zontal diameter, the longest spines being about 70 mm. in length. 

 Possibly this will ultimately prove to represent a separate variety or 

 even species. For the present I can, however, only regard it as 

 belonging, together with the other specimens here mentioned, to 

 S. grandis. 



The specimen from station 5392 is abnormal in having genital 1 

 divided into two almost equal halves, each with its genital pore. 



STEREOCIDARIS GRANDIS, var. RUBRA, new variety 



Plate 68, figs. 1, 2 



Locality. — Station 5135; in the vicinity of Jolo (Sulu) ; Jolo Light 

 bearing S. 46° W., 11.9 miles distant (lat. 6° 11' 50" N., long. 121° 

 08' 20" E.); 294 meters; bottom temperature 14.11° C; fine coral 

 sand; February 7, 1908 (1 specimen, the type, Cat. No. E. 1336, 



U.S.N.M.). 



Measurements 



Characters. — In its general characters this specimen is so very like 

 the typical S. grandis that there would be no reason to keep it sepa- 

 rate were it not for its very conspicuous red color. Not only the 

 spines, primaries, secondaries, and miliaries are of a deep red, but 

 the naked test also is intensively red, even down to the peristome; 

 the red color is also found in the areoles, in the ambital ones only as 

 radiating streaks, while the uppermost complete areole is wholly red; 

 the upper part of the boss and the mamelon remain white. In the 

 ambulacra the interporif erous zone is also intensively red, nearly down 

 to the peristome, while the pore zone remains whitish. 



As the typical form may also have a more or less conspicuous 

 reddish tint on the apical system and in the uppermost part of the 

 mterambulacra, it is rather probable that this color difference is not 

 sufficiently reliable to permit us to regard this form as a separate 

 species, and, at least so long as only this single specimen is known, 

 it would seem best to regard it only as a variety of S. grandis. 



