PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 607 



and the distal edge is rather strongly concave, strongly everted, and armed with webbed 

 spines. The next four brachials are twice as broad as long, almost oblong with some- 

 what concave lateral borders and the central portion of the distal edge raised into a 

 high erect frill of webbed spines. The brachials following the second syzygy are very 

 obliquely wedge-shaped, longer than broad, with the central portion of the distal 

 edge armed with a high frill of webbed spines that disappears after about the twenty- 

 fifth brachial. Distally the brachials become longer with slightly concave sides and 

 smooth ends. 



Syzygies occur between brachials 3+4, 9 + 10, and 14+15, and distally at intervals 

 of 2 muscular articulations. 



P! is about 6.8 mm. long, slender, very flexible basally, becoming filiform and less 

 flexible distally. It is composed of about 24 segments, of which the first five or six 

 are about as long as broad with the corners cut away, the eighth or ninth is twice as 

 long as the median width, with the distal end strongly flaring and overlapping and the 

 proximal end somewhat enlarged, and those following slowly increase in length, the 

 distal being very slender and five or six times as long as broad or even longer. The 

 elongated segments have expanded distal ends that overlap slightly the somewhat 

 enlarged bases of the segments succeeding. The short proximal segments have tufts of 

 webbed spines on the convex side toward the arm tip. P 2 is about 5.7 mm. long 

 with about 13 segments, of which the first is broader than long, the second and third 

 are about as broad as long, and those following gradually increase in length, becoming 

 much elongated distally. The pinnule is about as stout basally as P l; but it tapers 

 more slowly and consequently appears considerably stouter in its distal half. The 

 distal ends of the segments are more or less produced, and some of the proximal seg- 

 ments bear fine spines on the distal ventral border and a single large spine on the distal 

 end of the side toward the arm tip. The slender distal segments have swollen ends, 

 the distal ends being overlapping and finely spinous. The fourth to eighth segments 

 bear a gonad. The distal pinnules are 9 mm. long, with about 20 segments, of which 

 the first two are short and broad and those following rapidly become elongated and 

 very long and slender distally. The distal ends of the segments are overlapping and 

 very finely spinous. 



Spicules in the perisome of the pinnules appear to be very scarce. They consist 

 of very slender straight or slightly curved rods with unmodified ends. 



The color (dry) is yellowish white, the cirri white. 



Notes. Dr. Hubert Lyman Clark wrote that this long-armed, delicate comatulid 

 seems to be rather uncommon, though it was taken on both Atlantis cruises, in 1938 

 and in 1939. It occurs along the northern coast of Camaguey, Santa Clara, and 

 Matanzas Provinces, Cuba, in 195 to 425 fathoms, and also on the southern coast of the 

 island at Bahia de Cochinos in 185 fathoms. He said that the largest and best preserved 

 of the nine specimens has arms 75 to 80 mm. long. 



Localities. Atlantis station 2982; north of Punta Alegre, Camaguey Province 

 Gat. 2248' N., long. 7850'30" W.); 383 meters; March 11, 1938 [H. L. Clark, 1941]. 



Atlantis station 2982C; north of Punta Alegre, Camaguey Province (lat. 2248' N., 

 long. 7850' W.); 383 meters; March 11, 1938 [H. L. Clark, 1941]. 



Atlantis station 2989; nortli of Puerto Sagua la Grande, Santa Clara Province 

 (lat. 2310' N., long. 8004' W.) ; 658 meters; March 14, 1938 [A. H. Clark, 1940; 

 H. L. Clark, 1941] (1, M.C.Z., 1010). Type locality. 



