ECHINUS LUCIDUS. 207 



primordial ambulacral plates, a few rounded sea'tered plates, distal to them. 

 All the plates carry more or less numerous pedicellarise, but no spines. The 

 primary spines are 20-25 mm. in length, rather slender and tapering. The 

 secondaries are much shorter and even more slender relatively. The pedicella- 

 rise are abundant, but not peculiar. The valves of the globiferous (PI. 9.3, figs. 

 2, 3) measure about .80 mm. long; the base is about .30 mm. long by .23 wide. 

 There are two or three teeth on each side of the blade near the tip. The small 

 tridentate pedicellarise have broad, curved, truncate valves, but the large ones 

 have narrow straight, pointed valves, which may be over a miUimeter long. 

 The valves of the ophicephalous pedicellarise are very broad and are not con- 

 stricted; they are .35-.45 mm. long besides the loop. The triphyllous valves 

 are about .16 by .14 mm. The spicules are bihamate and the sphseridia are not 

 peculiar. 



The color of the test is Ught purplish brown, lightest on the poriferous areas 

 and along the median interambulacral suture. The spines are light reddish 

 brown. Actinally both test and spines are much lighter, practically white. 



The specimen upon which this species is based was taken by the "Challenger " 

 (St. 308) off the coast of southern Chile, in 175 fms. It is listed, without com- 

 ment, in the Report on the "Challenger" Echini, as Echinus norvegicus. Al- 

 though very close to that species, it is even nearer to elegans, so that its rightful 

 position is doubtful. The color is so unlike any elegans, that it looks very 

 different, and this fact, in connection with the geographical isolation of the 

 specimen favors its specific separation. 



Echinus lucidus D6d. 



Echinus lucidus Doderlein, 1885. Arch. f. Naturg., Jahrg. LI, 1, p. 97. 



Plate 107, figs. 1-3. 



The series of specimens, ranging in diameter from 12 to 40 mm., has made 

 very clear the close relationship which this species bears to elegans and it is 

 doubtful if the two characters by which they are separated in the table above 

 (p. 263) are likely to prove either important or constant. I am not ready 

 however to affirm the identity of the two and expect that in life there may be 

 important color differences. Among the preserved specimens however, there 

 are dingy yellowish and whitish individuals of both species. The specimens of 

 lucidus show great diversity in the length and stoutness of the primary spines, 



