PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 605 



elongated and less obliquely wedge-shaped. The distal ends of the brachials are mod- 

 erately spinous, this feature continuing to the arm tips. 



Syzygies occur between brachials 3+4, 9 + 10, and 14 + 15 (sometimes 13 + 14), 

 and distally at intervals of 2 muscular articulations. 



PI is 8 mm. long, rather slender and flexible throughout, though especially so in the 

 basal third. It is composed of 24 segments, of which the first is short and those follow- 

 ing gradually increase hi length, becoming about as long as broad on the seventh and 

 twice as long as broad distally. The earlier segments have their corners cut away 

 and all the segments are somewhat constricted centrally with the distal end armed 

 with a row of rather long, stout, sharp spines, which are especially prominent on the 

 segments in the distal half. P 2 is about 5 mm. long, with 12+ segments. In the 

 basal half it is about as stout as PI and the segments are similar though somewhat 

 longer; beyond the seventh the segments become very slender and much elongated. 

 All the segments have spinous ends, and the fifth to seventh bear a gonad. 



The spicules are difficult to make out satisfactorily from the dried specimen. 

 Along the edge of each pinnule segment there are, on each side, three slender spicules 

 each about a third as long as the pinnule segment directed upward and distally. These 

 spicules are slightly waved or irregularly and very slightly sinuous and are usually, 

 though not always, slightly bent outward at about the middle. The proximal three- 

 quarters is smooth, or, rarely, with a few widely scattered low points; the distal 

 quarter bears a number of short conical points, and may be broadened with a central 

 perforation. Along the outer border of the lappets runs a broad band of shorter, 

 highly irregular, interlacing spicules. These are straight or more or less strongly 

 curved and are rather thickly studded with conical projections, which are often elon- 

 gated into spines sometimes with forked tips that occasionally are joined into a loop. 

 The spicules may be forked or more or less extensively branched distally, or may bear 

 one or more irregular fkngelike lateral expansions pierced by a hole. Rarely in the 

 forked spicules do the two arms of the fork unite distally. 



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



Notes. Dr. H. L. Clark wrote that this apparently uncommon comatulid was 

 taken by the Atlantis once in 1938 but it was not seen in 1939. The two specimens 

 are in fairly good condition, the disk 3 or 4 mm. across, the arms 60 mm. long, and the 

 cirri 25 to 30 mm. long, but stouter than those of C. attantidis. Both were taken at 

 station 2990. 



Locality .Atlantis station 2990; off Puerto Sagua la Grande, Nicholas Channel, 

 Santa Clara Province, Cuba (lat. 2315' N., long. 8008' W.); 713 meters; March 14, 

 1938 [A. H. Clark, 1940; H. L. Clark, 1941] (2, M.C.Z., 1012 [holotype] and one other). 



CARYOMETRA ALOPE (A. H. Clark) 



Caryometra alope A. H. CLARK, Mem. Soc. Cubana Hist. Nat., vol. 14, No. 2, 1940, p. 143 (in key), 

 p. 156 (description; Atlantis station 2989), pi. 21, fig. 7; text fig. 6, p. 158. H. L. CLARK, Mem. 

 Soc. Cubana Hist. Nat., vol. 15, No. 1, 1941, p. 11 (Atlantis stations 2982, 2982C, 2989, 2990A, 

 3320, 3406, 3463, 3469; notes). A. H. CLARK, Bull. U.S: Fish. Comm., vol. 55, 1954, p. 374 

 (listed). 



Diagnostic features. The cirri are slender and of moderate length, with 24 to 34 

 (the longer with about 30) segments, of which the longest proximal are nearly four 

 times as long as the median width and the terminal are about as long as broad; they 



