270 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



The most conspicuous difference, however, is found in the apical 

 system, which is much more closely tuberculated than in the typical 

 form; the shape of the oculars also is quite different. (Fig. 12, to 

 compare with fig. 10.) 



The primary spines are scarcely so long as in the typical form, 

 generally not more than about twice the horizontal diameter, but 

 otherwise they are not appreciably different; the secondary spines 

 do not differ from those of the type. 



In the pedicellariae no difference is found in the globiferous form, 

 but the " tridentate" form is, as a rule, somewhat shorter and broader 

 than in the type. (PI. 79, figs. 7-8.) All transitional forms are 

 found between the tridentate and the usual small globiferous type 



(pi. 79, figs. 4-6), so that no 

 doubt can exist about the appar- 

 ent tridentate being only trans- 

 formed globiferous and not true 

 tridentate pedicellariae. They 

 may reach a size of about 1.2 

 mm. in length of head; the stalk 

 is very short. 



In regard to the color it is note- 

 worthy that the primary spines 

 are white, not of the pinkish tint 

 usual in the typical form. 



Notes. — Some broken speci- 

 mens were found to contain mud 

 with Foraminifera in their intes- 

 tine. Some of them have an 

 ophiuran (OpMacantha, species) 

 clinging to their spines. One specimen is abnormal in having two 

 genital pores in genital 5. (PI. 61, fig. 11.) 



Remarks. — It is evident that this form can not simply be identified 

 with Goniocidaris (Cyrtocidaris) tenuispina; the shape of the oculars, 

 the closer tuberculation of the apical system and of the ambulacra 

 and interambulacra especially are fairly conspicuous differences. 

 Possibly it ought to be regarded as a separate species. The differences 

 are, however, not quite constant, as in the typical forms the oculars 

 sometimes have very nearly the same form, and it would, there- 

 fore, seem the best course, for the present, to designate it only as a 

 separate variety. 



GONIOCIDARIS (CYRTOCIDARIS) TENUISPINA, var. MAJOR, new variety 



Plate 58, fig. 2; plate 79, fig. 9 



Locality. — Station 5259; off northwestern Panay; Caluya Island 

 (S.) bearing S. 73° W., 12 miles distant (lat. 11° 57' 30" N., long. 



Fig. 12.— Apical system or Goniocidaris (Cyr- 



TOCIDARIS) TENUISPINA, NEW SPECIES, VAR. TTJBER- 

 CULATA, NEW VARIETY. X6 



