REPORT ON THE ECHINOIDEA MORTENSEN 275 



ing a transition to the spinules. The outer half, or a little more, of 

 the spine is without hairs or spinules, rather coarsely furrowed, the 

 ridges being more or less irregular, the surface of the spine thus ac- 

 quiring a more or less distinctly meandric aspect. The apical spines 

 are not different from the ambital ones. The oral primaries are 

 short, almost straight, with rather coarsely serrate edges. The fourth 

 is transitional to the ambital primaries. 



The secondary spines are all distinctly club-shaped, with finely 

 serrate ridges. (PL 78, fig. 6.) They are about 1 mm. long and are 

 rather erect. 



Only the small globiferous form of pedicellariae is present; these 

 are very inconspicuous, scarcely exceeding 0.2 mm. in length of head, 

 the stalk being up to 0.5 mm. long. The valves (pi. 78, fig. 7) are 

 rather slender, though not compressed, with a relatively large opening 

 and a strong end tooth. The spicules are coarsely spiny, somewhat 

 larger than usual, but otherwise of the typical cidarid form. 



In color the apical system is distinctly greenish, the green color con- 

 tinuing some way over the test. The primaries are pinkish in the 

 basal part, this color gradually paling outwardly so that the points 

 are white. 



Remarks. — That this specimen is nearly related to hirsutispina 

 (de Meijere) is beyond doubt. It differs, however, from that species 

 in some features, for instance in the conspicuous green color (hirsuti- 

 spina is not at all green), in having the primary tubercles larger, and 

 i*i addition in some minor points in the apical system and in the 

 ambulacra. It is evident that these differences forbid simply iden- 

 tifying the present form with hirsutispina. The question is only 

 whether it should be regarded as a separate species or only as a vari- 

 ety of hirsutispina. With the scanty material at present available 

 (only one adult specimen of hirsutispina, besides the type specimen 

 which is not yet adult) it is impossible to reach a definite solution of 

 the question, as it is impossible to judge of the constancy of the 

 characters pointed out. I am rather inclined to think that the form 

 from the Philippines will prove to be a separate species, but for the 

 present it may suffice to designate it only as a variety of hirsutispina. 



Genus SCHIZOCIDARIS Mortensen 



Diagnosis. — A genus of Goniocidaridae with small but distinct 

 grooves at the median end of the horizontal sutures. Primary spines 

 without a basal disk; the apical primaries simple, not with the point 

 widened into a disk. Surface of primary spines covered with a coat 

 of fine hairs, widened at the top into large fenestrated plates, which 

 coalesce so as to form a complete closed roof all over the spine, rest- 



