30 (Bulletin of the (Natural History Society. 
each a double curve, form collectively an urn-shaped figure. Each 
arm is composed of many joints (up to three hundred in the largest 
specimens) and bears two rows, which coalesce towards the extremities- 
of the arms, of pinnules, each of which consists of from thirty to one 
hundred joints, and the lowermost of which, on account of a row of 
dorsal tubercles, have a serrate appearance. 
It lives upon mud, sand and rock bottoms, but almost nothing is 
known of its habits. In its development from the egg it passes through 
a metamorphosis, begin ning with a barrel-shaped larva with four 
encircling bands of cilia, and passing on to a stalked stage in which it 
resembles the adult condition of the fixed crinoids. Afterwards it 
becomes free. 
It has been pointed out (Y), that Stimpson’s specimen may have been 
Antcdon quaclrata and not A. Eschrichti. So closely allied are these two 
species that some naturalists consider them to be one, and at the best 
it is only with difficulty that they can be distinguished. The shape of 
certain joints of the arms and relative length of certain pinnnule& 
are the most obvious characters which separate them. 
Class II. ASTEROIDEA (Starfishes). 
Pentagonal or star-shaped dorso-ventrally compressed Echinoderms 
vnth ambxdacrcd feet confined to the ventral surface, and inter- 
nal skeletal pieces in the ambulacra articulated together like 
vertebrce. 
Order I. OPHIUKIDEA (The Snake Stars). 
Astcroidea with Jong cylindrical arms sharply distinct from the disk, not contain- 
ing appendages of the alimentary canal; ambidacral groove covered by 
plates so that the ambidacral feet project at the sides of the arms. 
FAMILY EURYALIDA]. 
Mostly with branched arms which can be curved toimrdsthe mouth and are without 
plates, with a soft skin closing the ventral groove. 
2. Gorgonoceplialiis Agassizii, (Stimpson), Lymax. As- 
trophyton Agassizii, St. (D), etc. [See Plate, Fig. 2.] 
Basket-fish. Sea-spider. 
Description^. (D) p. 12, (J) p. 18G, (U) p. G9. 
Figure. (K) p. 151, (U) pi. V. 
Distribution, (a) General; — Low -water mark to 800 
fathoms. South of Cape Cod, Bay of Fundy, Gulf of St. Law- 
rence, Davis Strait, Smith Sound, Vadso, Finmark. 
