140 A. EF. Verrilli—Marine Fauna off the New England Coast. 
defined paxille, those toward the center decidedly larger, each 
surmounted by a regular rosette of short, bluntly rounded, not 
very small spinules, which, on the larger paxillee, form a central 
cluster of 12 to 20 or more, with a regular circle of slightly 
larger ones around the edge; these rosettes appear more or less 
hexagonal, and decrease in size toward the margins and on the 
arms. ‘The dorsal area of the arms is wide at base, but narrow 
distally. Marginal plates about 20 on each side of the arms, 
above and below, rather large, not very convex, evenly covered 
with rounded granules. Actinal surface with large triangular 
areas, occupied by regular, rather large, clearly defined paxille, 
with regular rosettes of not very fine, blunt spinules. The 
adambulacral plates bear, each, a group of about five, rather 
long, slender, tapering, nearly equal spines, which stand in 
regular longitudinal rows, the edges of the plates projecting 
inward but slightly ; outside the inner group of spines, there 1s 
a rosette of shorter blunt spines, of which the three or four inner- 
most are larger and longer than the outer ones, which are small, 
like those of the paxille. Oral plates not swollen, bordered, 
on each side by seven or eight, rather stout, vertically flattened 
spines, and terminated at the inner end by two decidedly longer 
and stouter ones; their surface bears two regular median rows 
of seven to nine shorter spinules, and usnally a row of three or 
four small ones between these and the marginal series. Ambu- 
lacral feet well developed, with a conspicuous, concave, ter- 
minai sucker. reater radius of one of the largest examples, 
38™"; lesser radius, 16™. Color, when living, light orange. 
crowded spinules; the marginal plates often bear a central 
spine; the ventral paxille are more convex, with much finer 
and more crowded spinules; the adambulacral spines are smal- 
ler, finer, and more numerous (8 to 10), with finer spinules out- 
side of them; the oral plates are decidedly swollen, with a 
crowd of fine spinules over the surface, and with the marginal 
spines, more numerous, smaller and more acute: it also has 
large, conical ambulacral feet, with a rudimentary sucker. 
A. Parelii agrees nearly with the last in form, but has still 
longer and more narrowed arms. From A. Bairdiz it differs 1n 
