142 rilOCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



eighth or ninth with 10 joints, of which the third-seventh are bluntly 

 keeled and much expanded dorso-ventrally, and bear a large genital 

 gland, protected with large plates; the terminal joints of these pin- 

 nules are minute, the basal not especially stout; the terminal pinnules 

 are 10 mm. long, with 15 moderately elongated joints, the ambulacra 

 well plated. 



Color in life yellowish brown. 



7^/^^^. —Cat. No. 22629, U.S.N.M.; from Alhatross station No. 

 4918; 30° 22' 00" north latitude, 129° 08' 30" east longitude (Eastern 

 Sea); 361 fathoms; August 13, 1906. 



15. ANTEDON GARRETTIANA,« new species. 



Centro-dorsal subconical, Ijearing about 15 closely set cirri, roughly 

 divisible into 5 radial clusters, indicated by slight dorsal prolongations 

 of the basals; cirri 20 mm. long, with 16 joints, all somewhat longer 

 than wide, sharply carinate dorsally, but without dorsal spines. 



Basals prominent, appearing as tubercles between (and below) the 

 first radials. 



First radials short, smooth, with a strong, rounded dorsal keel; 

 second radials much longer, between two and three times as wide as 

 high, also with a strong rounded median keel; axillaries widely pen- 

 tagonal, about twice as wide as high, with a rounded keel extending 

 from the base to the apex of the pentagon; radials and first 3 brachials 

 in close contact all around, and with sharply flattened sides. Eleven 

 arms, 65 mm. long, bidistichate; first 9 brachials discoidal, the first with 

 a strong rounded keel, which soon becomes inconspicuous and disap- 

 pears altogether on the eighth; succeeding brachials quadrate, becom- 

 ing elongate toward the end of the arms; a syzygy in the third brachial, 

 another about the thirteenth, and distally at intervals of 6-10 joints. 



First pinnule slightly the longest, 6 mm. long, with 20 nearly square 

 joints, the first but little wider than the others, which taper regularly 

 to a point; the following pinnules gradually decrease in length to about 

 the seventeenth brachial, which has a very short pinnule, then increase 

 again distally, whore the pinnules are 6 mm. long, moderately slender, 

 with 15 joints. 



Color in life, dull yellowish white. 



Tyj)e.—Q?it. No. 22633, U.S.N.M.; ivom Alhatross station No. 4894; 

 32° 33' 00" north latitude, 128° 32' 10" east longitude (Eastern Sea); 

 95 fathoms; August 9, 1906. 



This species comes nearest to A. acideaia Carpenter, from which, 

 however, it is readily distinguished by the presence of prominent 

 basals, the much greater proportionate length of the radials, and the 

 obsolete and faintly indicated carination of the lower brachials. 



a For the late Lieut. -Commander Leroy M. Garrett, U. S. N., the commanding 

 officer of the Albatross during the recent cruise. 



