PEDICELLATA. 333 
Those, which have five non-ramous rays round a central disk, form 
the Opnrur# of M. Delamarck; but we should also distinguish 
Those in which these rays are furnished on each side with movable 
spines; the little fleshy feet also issue from each side between the 
origin of those spines(1); and 
Those in which there are none of these lateral spines, but where 
the rays are covered with imbricated scales, and resemble tails of 
serpents. The central disk, in each interval of its rays, and on the 
side where the mouth is placed, is marked by four holes which ex- 
tend into the interior of the animal, serving perhaps for respiration, 
or, according to the others, for the issue of the ova. Their only 
feet are in five short grooves, which form a star round the mouth(2). 
‘The GorconocEePHaLa, Leach(3), called Euryates by M. de La- 
marck, are those in which the rays are dichotomously divided. In 
some this division commences at the base of the rays, presenting 
the appearance of a bundle of serpents—they are commonly called 
Medusa’s Head(4). There are two preceding holes at the base of 
each ray. 
In others, however, this division only commences at the end of 
the ray, and is not often repeated(5). 
We should also separate the . 
Atecto of Leach, called Comaruta by M. de Lamarck. They 
have five large articulated rays, each of which is divided into two or 
three, bearing two ranges of articulated threads;‘these five rays are 
attached to a petrous disk also furnished, on the side opposite to the 
mouth, with one, two or three ranges of articulated threads with- 
out branches, shorter and more slender than the large rays, and by 
which the animal is said to fix itself. The sac which contains the 
viscera is situated in the centre of the large rays, opening by a stel- 
(1) Ast. nigra, Mull., Zool. Dan., d, XCUI;—A. tricolor, Ib., XCVI; A. fragilis, 
Ib., XCVILI;—.2. filiformis? Ib., LUX;—A. aculeata, Link., XX VI, 42; Miill., Zool. 
Dan., XCXIX;—Ophiura echinata, Lam.; Encyc., CXXIV, 2, 3;—Oph. ciliaris, Ib., 
4, 5;—Oph. lumbricalis, Ib., 1. 
(2) Asterias ophiura, L.; Ophiura lacerta, Lam., Encyc. CXXII, 1, CXXIU;— 
Oph. texturata, Id.; Link., IL, 4; Encye. CXXIII, 2, 3;—Oph. cuspidifera, Lam.? 
Encyc., CXXI, 5—8. 
(3) Zool. Miscel., No. 16, p. 51. 
(4) Asterias caput. Medusz, L., (Euryale asperum) Lam.; Link., XX, 32; Encyc. 
CXXVII;—L£uryale muricatum, Ib., CXXVIIL and CXXIX;—Asterias euryale, 
Gm. (Luryale costosum) Ib., CXXX; Link., XXIX and XXX. 
(5) Euryale palmiferum, Lam., Encyc., CXXVI. 
