288 ANTEDON. 
Centro-dorsal a truncated hemisphere, marked by indistinct interradial ridges, which are pro- | 
duced upwards into rather prominent processes between the radials. Twenty to twenty-five cirri, 4 
of eighteen to twenty-three smooth joints, most of which F 
eZ, are slightly longer than wide; the penultimate without 
bby an opposing spine. 
cessors triangular, and wider than long, gradually be- 
coming longer and more quadrate. 
The first syzygy is in the third brachial when the 
Yi: ne” First radials entirely concealed; the second quite 
NEY | short, especially in the middle line, barely in contact 
VN iy above the angles of the centro-dorsal. They are deeply 
BY SS iy incised by the tubercular backward processes of the 
Rh “ ted axillaries, which sometimes almost reach the centro- 
\ WE Qi A dorsal. Three distichals, the junction of the first two 
Wy OAH SQ somewhat tubercular, and the axillary a syzygy, in close 
SS ee a WG contact with its fellow on the next ray. The outer 
WSS AN radials and the three distichal joints have sharp straight 
SASS Ne edges, and both sides flattened, and the first two or 
NA Sy eo, a three brachials may show the same characters, but to 
SOR RES aI a less extent. | 
SS SL =! Fourteen to twenty arms, of over one hundred 
~S ae joints, of which the lowest are nearly oblong, their suc- 
4 
< SS E SSS 
S > 
PV rpeae as 
yy : 
er ie % 
SS Cae primary arms do not divide, and the next between the 
S85 oe ee eleventh and fifteenth. When distichals are present 
“SSA the first two brachials are usually united by syzygy, 
{ Spies BN and the next syzygial joint is from the seventh to the 
VA SRSA twenty-fifth brachial, usually about the twelfth or four- 
SH! CYR A = teenth. After this an interval of four to twelve, gen- 
Ey if PR ISR Rl erally six or seven joints, between successive syzygia. 
asi Sarre eithe The distichal pinnule is about 9mm. long, and con- 
Sines thargst sn sists of some thirty short, carinate joints, the lowest of 
Mies Peso which, though thick, are not specially wide. The next 
Saye two or three pinnules are of about the same length, 
Wee xas-4 with relatively longer terminal joints, and the lower 
3 Bt ee ones somewhat flatter. The following pinnules are a 
i of aaa gee little shorter, with the first two joints smaller than in 
i} LAS) <a. © the proximal pinnules; but the third joint and from two 
EB) i A ere to four of its successors are broad and flattened, with 
ay AG RSA the outer edges much produced towards the ventral 
AY YEG CHAEER SY = side. Traces of this expansion may be visible as far as 
i ere= AE the twenty-fifth brachial, after which the joints become 
SECS ea es elongated and the pinnules more slender. 
Wee se EE The disk is much incised and completely plated, as 
SPS SSs ee are also the brachial ambulacra and the interarticular 
Seca ie SMe spaces. The genital glands are covered by closely set 
SONS plates in which sacculi are imbedded. These are small 
Tees S, NINA and inconspicuous on the pinnule-ambulacra, which 
Sees sso. ty have well-defined side plates. ‘ 
aise Sere SY Colour in spirit, —light whitish-brown. Disk 7mm.; 
i Sat ad spread 15cm. 
\ Eas “yy 
CMe inn 
a eg ) Sey Aus Griinden, welche sich aus dem Fol- 
BED genden ergeben, sei hier auch die Beschrei- 
Fia. 2. A. a eo a ee bung, welche Carpenter von A. inaequalis 
2 au. sp. ° ° . 
Ce ee ee Carp. (Chall. Rep., 26, p. 244, pl. 2, fig. 5, 
und pl. 51, fig. 2; p. 246, fig. 5a) gegeben hat, anschliessend angefiihrt: 
