NO. 1559. NEW RECENT UNSTALKED CRINOIDS— CLARK. 83 



C3^1indrical joints, not carinate basally; the following pinnules grad- 

 ually become more slender and elongated. 



Color (in spirits) rather dark brown. 



Ti//>e. — Cat. No. 22610, U.S. N.M.; Camp Clay, Cape Sabine, arctic 

 coast of Alaska; received from Lieut. (nowMaj. (len.) A. W.Crreeley, 

 U. S. Army, in 1886. 



This species is interesting in belonging, to quite a different type of 

 the Ten ella ^vou.^ from those heretofore known as inhabitants of the 

 Arctic seas, which agree in having from half again as many to twice 

 as many cirrus joints as A. arctlca^ and the second pinnule usually 

 much smaller than the lirst, whereas in A. (irctica the second pinnule 

 is as long as or even a trifle longer than the first. A. .arctica repre- 

 sents a group of species occurring in the southern seas from 46° south 

 latitude north to about the equator; and this fact is of especial interest 

 in that the Bering Sea and north Pacific (exclusive of the Okhotsk Sea 

 and Sea of Japan) species of the EHchrlchtli group are also more 

 nearly related to the antarctic than to the arctic species. 



22. ANTEDON BRISEIS, new species. 



Centro-dorsal discoidal or low hemispherical, the pole papillose, 

 bearing about 20 cirri in 2 or 3 irregular marginal rows; cirri 8 mm. 

 long with 12 to 14 joints, all longer than wide, the second to the 

 seventh greatly elongated; the joints arc somewhat constricted in the 

 middle, with prominent articidations, and do not bear dorsal spines. 



First radials just visi})le; second radials very short, al)out four 

 times as wide as long, somewhat incised l)y the axillary; they have 

 strong rounded median keels, posterior lateral tubercles on each side, 

 and a dorso- ventral ridge in the anterior portion; axillaries rhombic, 

 about as wide as high, all the sides, especially the two posterior, 

 much incurved, with a strong posterior median tubercle, which is con- 

 tinued backward over the second radial. Ten arms 23 nun. long; the 

 first brachial has a short inner and long outer edge, and is deeply 

 incised by the backward projection of the second brachial; second bra- 

 chial irregular in shape, the inner edge ver}' short, the outer long, the 

 two proximal edges much incurved; there is a large tubercle on its pos- 

 terior l)order, o\'erlapping the first l>rachial; third brachial squarish; 

 following brachials quadrate, at first wider than long, but becoming 

 longer than wide after the tenth, and elongate distally; syzygies in 

 the third, eighth, and twelfth brachials and distally at intervals of 

 two joints. 



First pinnule 2.5 mm. long with 7 joints, all but the first 2, which 

 are squarish, greatly elongated; second pinnule similar, but appar- 

 ently very slightly shorter; the distal pinnules are 4 mm. long, exceed- 

 ingl}^ slender, with about 15 joints, all but the first 2, which are very 



