76 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiir. 



so; the fourth pinnule is still smaller, the minimum being reached 

 on the seventh or eighth, after which the length increases distally. 

 Antedon inex2)ectata is a somewhat stouter species than A. asjjerrlma, 

 and is usually' smaller, although some individuals are fully as large as 

 nw largest of that species, measuring, arms 2P>() nuu., cirri TO mm. 

 The third syzygv is in the twelfth brachial. 



The color in spirits is brownish yellow. 



7^y^;,..__Cat. No. 2i3B47, U.S.N.M.; from .lM(7//v>,s.v .station No. 2853; 

 56° 00' 00" north latitude, 154° 20' 00" west longitude (south of Alaska 

 Peninsula); 159 fathoms; August 0, 1888. 



10. ANTEDON RATHBUNI," new species. 



This species resembles Antedon asjMrrima, but is ver}^ much more 

 robust, with the lower arm joints strongly tubercular; the first three 

 pinnules are of equal length, the fourth somewhat, and the fifth much 

 shorter, little over half as long as the third. The arrangement of the 

 syz3"gies is as in A. asperrima. 



The color in life is brig-ht yellow. 



7y/je.— Cat. No. 2261S, U.S.N.M.; from Alhatro.^.s station No. 5033; 

 44° 04' 20" north latitude, 145° 28' 00" east longitude (in Yezo Straits); 

 533 fathoms; September 30, 1906. 



II. ANTEDON BRACHYMERA, new species. 



Centro-dorsal hemispherical, bearing 30 to 50 cirri; these are 45 

 mm. or 50 nun. long, with 40 to 45 joints of which the distal third 

 bear low dorsal spines. 



First radials just visible; second radials short, trapezoidal, much 

 wider than high; 10 arms 160 mm. long; first 14 or 1-5 brachials 

 smooth, slightly tubercular, wider than long, irregularly o))long or 

 somewhat quadrate; following brachials low-quadrate, becoming shorter 

 distally, the distal edges produced outward, but smooth and not over- 

 lapping; none of the brachials are triangular, and all are wider than 

 long, the middle and distal verj^ much so; syzygies in the third and 

 eighth, usually also in the twelfth brachials, and distally at intervals 

 of from one to five, usuall}^ three joints. 



First pinmde 30 nun. long with 65 to 70 short and wide joints, the 

 distal third with a comb; second pinnule the same length or very 

 slightly shorter, similar to the first, but with the comb not so pro- 

 nounced; third pinnule like the fourth, 16 mm. long with 28 joints, 

 mostly rather longer than wide; the following pinnules decrease in 

 length to about the tenth, then increase again distally. 



Color in life j^ellowish white, readily distinguishiible from the lemon 

 yellow Ardedon e.'<Ghricht a maxima^ with which it is always associated. 



«For Dr. Richard Rathbun, in recognition of his work on the Crinoidea. 



