80 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



First radials visible at angles of calj^x; second radials crescentic, 

 deepl}' incised to receive the strong- backward projection of the axil- 

 laries; axillaries quadrate in form, about as long as wide, all the sides 

 somewhat concave; 10 arms; the iirst brachials have long- outer and 

 short inner sides, and are very deeply incised by the second brachials, 

 which are nearly square; the six following brachials are oblong, sub- 

 sequentlj" becoming quadrate for a few joints, then triangular; a 

 s3'zyoy in the third brachial, another about the eighth, and others 

 distally at intervals of from 5-10 joints. 



The first pinnule is about 20 mm. long and ver}^ slender, composed of 

 16 greatly elongated joints; the second pinnule is 15 mm. long with 

 about 12 elongated joints; the following pinnules decrease in length, 

 their component joints being much shorter proportionately; the distal 

 pinnules are 17 mm. long with about 17 greatly elongated joints. 



Color in life, dull purple, rather dark. 



Ti/pe.— Cat. No. 22613 U.S.N.M.; from Alljafros-s station No. -1981; 

 42^ 58' 15" north latitude, 110^ 09' 10" east longitude (Sea of Japan); 

 406-390 fathoms; September 19, 1906. 



17. ANTEDON FRAGILIS, new species. 



This species is similar to ..1. erythrizon in the character of its centro- 

 dorsal and in its general appearance; but the cirri consist of about 30 

 greatly elongated smooth joints; the first two pinnules are equal in 

 length, comparatively short (11 mm.) but slender, with about 20 elon- 

 gated joints, the third longer and distinctly stouter; the axillaries and 

 low^er brachials are more elongated than in A. erythrizon; syzygial 

 interval 2, sometimes 3, joints. 



Color in life, light purplish brown. 



Type.—Qvii. No. 22611, U.S.N.M.; from Alhatrfm station No. 5032; 

 41^ 05' 00" north latitude, 145° 30'. 00" east longitude (Yezo Straits); 

 500 fathoms; September 30, 1906. 



18. ANTEDON TENUIS, new species. 



(?) Antedon species, von Gkaff Oudlenger Reports 1884, vol. X of Zoology, No. 

 27, p. 79 (Vladivostok). 



Centro-dorsal flattened hemispherical, bearing about 40-50 cirri, the 

 pole free; the cirri are 25 mm. long and have about 20 elongated joints, 

 becoming shorter distally and developing a low dorsal spine. 



First radials concealed; second radials short and deeply incised by 

 the axillaries; axillaries slightly wider than high, rhombic, the edges 

 slightly concave; the axillaries are wider than the second radials; 10 

 arms, 110 mm. long and very slender; first brachial very short, the 

 outer edge longer than the inner; second irregularly quadrate; follow- 

 ing brachials to the eighth sq-aarish, then quadrate to somewhat past 

 the middle of the arm, after which they become long and "dicebox 



