NO. 1569. NEW RECENT UNSTALKED CRINOIDS— CLARK. 77 



Ti/j^e.— Cat. No. 226J:9, U.S.N.M.; from Albatross station^^.o. 4:[)SQ', 

 43^ 01' -iO" north latitude, 140° 22' U)" east long-itude (Sea of Japan); 

 172 fathoms; September 19, 190(). 



12. ANTEDON SERRATISSIMA, new species. 



Centro-dorsal hemispherical, with 40 or 50 stout cirri, almost all 

 the joints of which bear strong- dorsal spines; the cirri are 30 mm. 

 lony, with about 3*5 joints, which exhibit a tendency to overlap. 



First radials concealed; se'cond barely visible; axillaries very broad; 

 10 arms 105 mm. in length; first brachials very short; second trian- 

 gular, approximally equilateral; third irregularl}' oblong; following 

 brachials to the tenth or twelfth, wedge-shaped, then triangular. 

 Syzygies in the third, eighth, and fourteenth l)rachials, and distally 

 at intervals of 2 joints. The radials and lower l)rachials are thickly 

 set with small sharp spines. Brachials overlapping, the edges of all 

 set with numerous small sharp teeth. 



The first pinmile is 17-21 mm, long with 45-60 short joints, and 

 bears a long com)) distally; the second pinnule (which is long-er than 

 the first) is from 18-22 mm. in length, with 45-60 joints; the third 

 pinnule may be 20 mm. long with 36 joints and bearing a com!) like 

 the second, or it may be 12 mm. long with elongated joints, like the 

 fourth; the distal pinnules are long and slender, their joints over- 

 lapping, the distal edges set with spines. 



Color in life 3'ellow, the cirri wdiitish; in spirits white, l)rown, or red. 



Tijpe.—CuL No. 22612, U.S.N.M.; from MxifrosM station No. 3464; 

 48° 14' 00" north latitude, 123° 20' 40" west longitude (off the coast of 

 Washington); 40 fathoms; September 4, 1891; 32 other specimens 

 from the coast of Washington, Oregon, and northern California. 



This is a much stouter species than Antedon perplexa., with propor- 

 tionately shorter arms. It is readily distinguishable from that form 

 by the spiny character of the radials. lower brachials, and pinnules, 

 and the proportionately greater size of the centro-dorsal. which 

 entirely conceals the first and almost entirely the second radials. 



13. ANTEDON MARIiE," new species. 



Centro-dorsal hemispherical, l)eai'ing about 50 cirri (the pole free) 

 dimorphic in character; the upper (about the edge of the centro- 

 dorsal) 60 nmi. in length, with 60 joints, compressed laterally, elongate 

 proximall}", short distalh", the distal joints with faintl}' indicated 

 spines; the lower 35 mm. in length with about 30 joints. 



First radials concealed except for a narrow border; second radials 

 short, about four times as wide as long; axillaries about as high or 



« For Mrs. Mary W. Clark, of Boston, Massachusetts, to whom I am indebted for 

 mncli valuable assistance in my work on the unstalked crinoids. 



