DOROCIDARIS CALACANTHA. 11 



There seems to be some variation in the coloring of the secondary spines ; in 

 some specimens they are yellowish green and in other light reddish brown. 



All three kinds of pedicellariaB occur in some specimens, but in others 

 only the tridentate and small globiferous are present. 



The large globiferous pedicellarioe (PI. 3, fig. l) are of the form found in 

 Cidaris, with valves .75-.80 mm. in length. The stalks have a well 

 developed limb (PL 3, fig. 8) and are from .80 to 1.50 mm. long. The few 

 examples of this sort of pedicellaria which were found were between the 

 primary spines on the interambulacra. 



The tridentate pedicellaria8 (PI. 3, figs. 4.-7) show much variety of 

 form, the valves in some being short and broad and in others long and 

 narrow. Many were only partially developed. The valves measure from 

 .65 to 1.25 mm. and the stalks vary greatly, sometimes shorter than, some- 

 times equal to, and sometimes twice as long as the valves. These pedi- 

 cellariae are common on the actinal portion of the interambulacra. 



The small globiferous pedicellarioB (PI. 3, figs. 2, 3) are remarkable for 



their great diversity of size, some of them being longer than the large 



globiferous form. The end-tooth on the valves is often wanting. The 



^ valves are .27-.87 mm. long and the stalk is 1-3 times that length. They 



are common everywhere. 



This species was collected at the following stations : 



Station 3749. Off Suno Saki, Sagami Bay, Japan. 83-158 fms. Bk. s, 

 sh. Three specimens. 



Station 3751. Off Suno Saki, Sagami Bay, Japan. 140-148 fms. Gn. 

 m. vol. s. Two specimens. 



Bathyinetrical range, 83-158 fathoms. 



Dorocidaris calacantha A. Ag. and Clark. 

 Plates 4, figs, i-i^; 13; 14; 34; 35. 



The specimens collected of this species vary in diameter from 40 mm. 

 (Pis. 34, 35) to 12 mm. (PI. 14; figs. 5-8). The primary radioles taper 

 very gradually from the slight swelling above the milled ring. 



The longest radioles of the largest specimen collected are 78 mm. in 

 length (Pis. 34, 35); they are delicately fluted (PI. 4, fig. 4), the ridges formed 

 of low serrations closely packed. The primary radioles are of a violet gray 

 tint, often banded with rings of a darker color than the shaft. The small 



