330 HAWAIIAN AND OTHER PACIFIC ECHINI. 



distance from each other is variable. The whole abactinal system is covered 

 by numerous tubercles of which four or five on the proximal margin of each 

 genital are large secondaries. The genital pores are large and occupy the distal 

 tips of the genital plates; the oculars are small and are all broadly exsert. The 

 buccal membrane is of course thin and perfectly bare; the buccal plates are very 

 small and not only are the pairs well separated from each other but the two plates 

 of a pair are some distance apart. The primary spines are 7 or 8 mm. long; 

 they taper little to the truncate tip, which usually has a conspicuous (under the 

 lens) central thorn. Though some of the small secondaries are a little thickened 

 at the tip, none of the spines are noticeably club-shaped. Pedicellarise are 

 exceedingly abundant all over the test. 



The general color of the test is brown, darkest on the interambulacra where 

 there is a distinct purple shade; the ambulacra are more greenish. In both 

 areas there is a distinct band of a light color, 2 or 3 mm. wide, along the median 

 vertical suture line, but these bands disappear actinally. The poriferous areas, 

 with the adjoining margins of the interambulacral plates, are somewhat lighter 

 than the remainder of the test. The small spines are almost white but the larger 

 spines are pale brown, though actinally they are tipped with lighter, and around 

 the mouth they are nearly white for their distal half. There is little indication 

 of either green or violet in the coloration but along the abactinal portions of the 

 poriferous areas, there are traces of dull rose-red. 



A second specimen measures 43 mm. in horizontal diameter and is 31 mm. 

 high. There are 30 interambulacral and 45 ambulacral plates in each column. 

 The interambulacra are 16 mm. wide and the ambulacra, 11; the poriferous 

 areas are each scarcely 2 mm. wide. The tuberculation of the test differs from 

 that of the type only as might be expected from the difference in size; there 

 are not so many large tubercles and the horizontal Ys on the interambulacral 

 plates are much less regular and noticeable; the pair of miliary tubercles above 

 the largest ambulacral primary (the one next the poriferous area) are very 

 regular in position and form a noticeable feature of the ambulacra. The colora- 

 tion is similar to that of the type but the median light colored bands in each area 

 are less distinct, and the dull rose shade on the poriferous areas is more marked 

 and is evident on all the abactinal coronal plates; it tends to form a more or 

 less distinct pattern on the interambulacra. The large spines are all much 

 lighter than in the type, but they are a little more brownish than the miliaries. 



These two specimens were collected by Mr. J. Gabriel, in March, 1911, at 

 Westernport, Victoria, in 2-5 fathoms. The coloration and form of the test 



