270 HAWAIIAN AND OTHER PACIFIC ECHINI. 



thus relatively more flattened than the adult. The abactinal system and 

 actinostome are 6 and 9 mm. in diameter respectively and are thus relatively 

 much larger than in the adult. The primary spines are also longer than in the 

 adult, equalling about one half the diameter of the test. The latter is stout and 

 rough as in the large specimen, and the abactinal system is essentially the same, 

 though, as might be expected, the suranal plate is more obvious. The buccal 

 membrane is thinner and contains numerous, minute plates. 



Pedicellarise are abundant. The globiferous are found mostly on the abacti- 

 nal surface. The valves (Plate 93, fig. 13) are .55-.70 mm. in length; the blade 

 and base are about equally long, and the latter is .20-.30 mm. wide. Besides 

 the conspicuous terminal tooth (PI. 93, fig. 14) there are two or three lateral 

 teeth on each side near the tip. The ophicephalous pedicellariae occur every- 

 where. The valves (PI. 93, fig. 12) are short, wide, and stout, not at all con- 

 stricted; they measure .20-.32 mm. long besides the loop, which adds about a 

 quarter more; the width is .75-. 85 of the length. The tridentate are less common 

 and are chiefly actinal in position; the valves (Plate 93, fig. 15) are short, only 

 .30-.50 mm. long, and are .10-. 13 mm. wide near the tip of the blade. The 

 triphyllous are very abundant everywhere, and the valves (PI. 93, fig. 11) are 

 as wide as long .10-. 12 mm. The sphseridia show no particular features and 

 the spicules, though excessively scarce in these specimens, appear to be normally 

 bihamate. 



The two specimens agree fairly well in color. The test is light reddish buff, 

 so light in the small individual as to be almost white. The spines are pale red, 

 brighter in the young one, where the shade is quite orange; they are lighter, 

 almost whitish, distally but in the adult each one has a dusky brownish tip; 

 this however is not conspicuous and may be artificial. 



The larger of these two specimens was taken by the "Blake" (Station 319) 

 in 262 fathoms, off South Carolina, was labelled and catalogued, without careful 

 examination, " Toxopneustes variegatus," and is listed thus in the final report 

 on the "Blake" Echini. The smaller specimen was taken by Count Pourtales 

 in 1868, off Sombrero Key, Florida, in 195 fathoms and is labelled "Echinus 

 Fkmingii. Echinus norvegicust " There appears to be no reason to doubt the 

 specific identity of the two specimens, or the distinctness of the species. Small 

 specimens might be mistaken for Wallisii, save for the bright coloration, but in 

 the adult, the height of the test is very characteristic. 



