304 Verrill, N'otes on Hadiata. 



Boletia Viridis VerriU, sp. nov.* 



A single specimen of this species was obtained by Mr. Bradley at 

 Callao, Peru. 



Diameter of test 2*7 inches; height 1'3; diameter of actinal area 

 •8 ; from outer end of madreporic plate to outside of opposite ocular 

 plate *3S; diameter of anal area -18; length of longest spines -65, 



The test is rather thick, depressed above, sides regularly arched, 

 lower side concave, nearly circular in outline. The ambulacra have 

 two row^s of primary tubercles extending to the summit, with an 

 irregular row of much smaller ones between them. The interambul- 

 acral zones have about six piincipal rows of tubercles on the lower 

 side, of which the next to the outermost are much the largest on 

 the upper side, and reach the genital plates ; the outermost rows 

 have small unequal tubercles. The secondary and large miliary tu- 

 bercles are numerous on the central part of the interambulacra. 

 The poriferous zones are rather wide, a little narrower beneath. The 

 pores form a nearly regular vertical row on the inner side of the 

 zones, separated from the others by a vertical row of small tubercles, 

 outside of which the pores are rather irregularly placed, but appar- 

 ently form two irregular alternating, vertical rows. The genital 

 plates bear spines ; tliey have a rounded angle outwardly, and are 

 longer than broad ; the openings are large. The ocular plates are 

 small, most of them excluded from the anal area. Anal membrane 

 covered by numerous, angular plates, which bear small spines. 

 Spines short, stout, tapering, very unequal in size. Actinal cuts 

 moderately deep ; buccal membrane thin, with a few small widely 

 separated scales. Color of spines bright green, the smaller ones often 

 with light yellow tips ; test brown. 



Euryechinns "Verrill, Proc. Boston Soc. Nat. Hist, x, p. 341. 

 Echinus {pars) Lamark ; Agassiz, Monog. d'Echinod., 2°ie liy. (lutroduction), July, 



1841, andliv. 4me (Introduction), Dec, 1841. 

 Toxopneustes (sub-genus, pars) Agassiz and Desor, Catal. Rais., 1846. 



This name was proposed, in the work cited, for a group of Echini 

 having E. Drobachiensis as the type, and including, in addition, 

 E. granulatus of New England, E. lividus of Europe, E. gibbosus, 

 Galapago Is., and E. DelalancUi of New Holland. Since that time, 

 however, I have received an authentic specimen of the last sjjecies 

 and have satisfied myself that it does not belong to the same group, 



* Mr. A. Agassiz considers this the Echinus chloroticus Val. If so the specimen 

 described was probably from the New Zealand coUectioii of Mr. Edwards, and acci- 

 dentally misplaced in packing at Callao, — Reprint. 



