A MONOGRAPH OF THE EXISTING CRINOIDS 385 



and more pronouncedly wedge-shaped than the first. The first syzygial pair (com- 

 posed of brachials 3 + 4) is oblong, from two and one-half to nearly three times as broad 

 as long. The next 2 brachials are similar to the third and fourth; those following 

 become obliquely wedge-shaped and longer, and after the ninth or tenth triangular 

 or very obhquely wedge-shaped, two-thirds or three-quarters as long as broad, later 

 becoming triangular or obliquely wedge-shaped, about as long as broad, and in the 

 tei'minal portion of the arm less obliquely wedge-shaped, and finally elongate, twice 

 as long as broad, or even somewhat longer. The fifth and following brachials have 

 more or less prominent distal ends, this feature soon becoming less marked and usually 

 dying away at about the middle of the arm, after which point the brachials are 

 practically smooth. 



Syzygies occur between brachials 3 + 4, again usually between brachials 11 + 12 

 (sometimes also between brachials 6 + 7), and distally at intervals of 3 muscular 

 articulations. 



Pi is about 10 mm. long, moderately stout basally but tapering evenly to a 

 slender and delicate tip. It is composed of about 35 segments, most of which are 

 about as long as broad. The terminal comb consists of 9 teeth which are spade- 

 shaped or almost circular, small, in height equal to only about one-half the width of 

 the segments which bear them, and well separated. Po is half as long as P,, 5 mm. 

 in length, and much more slender. It is composed of 15-20 segments, most of 

 which are about as long as broad, and bears a comb distally. P3 is slightly shorter 

 than P2, 4 mm. long, and is without a terminal comb. P4 is as long as P2, 5 mm. 

 in length, but is somewhat stouter than those preceding it, and carried a gonad. The 

 following pinnules are similar, toward the end of the proximal third of the arm gradu- 

 ally increasing in length and becoming more slender. The distal pinnules are from 

 8 to 9 mm. long. The pinnules are practically smooth, with no trace of dorsal carina- 

 tion. The distal ends of the segments are slightly everted and finely spinous. 



The color in alcohol is dark brown; in life, purple or yellow or a mixture of both. 



The preceding description is based chiefly upon a specimen from the Blackfish 

 Banks, off Charleston, S. C, taken in 22 meters of water. 



Notes. — In the larger of the two specimens labeled "Type," which are from 

 Charleston, S. C. (M. C. Z., 33), the dorsal pole of the ceutrodorsal is broad and 

 flat, 3 mm. in diameter. The cirrus sockets are arranged in one and a partial second 

 marginal row. The cirri are XXVI, 12, about 10 mm. long. The arms are about 

 45 mm. long. The smaller specimen has the arms about 30 mm. in length. 



Another specimen from Charleston (M. C. Z., 446) has the cirri XX, 10-12, 7 mm. 

 long, and the arms about 45 mm. in length. 



Of var. meridionalis Hartlaub studied 131 specimens, of which three-fourths 

 came from French Reef (39), Cape Frio (35), and Martinique. Ho said that the 

 specimens from French Reef served as the basis for the original description of the 

 species. This is not quite correct. The form was originally described, very inade- 

 quately, in 1865 from specimens from Charleston, S. C. The French Reef specimens 

 served as the basis for Pourtal^s' redescription in 1869. 



As described by Hartlaub the ceutrodorsal is thin and flat, with a inostlj' smooth 

 surface, more or less prominently pentagonal, reaching 3 mm. in diameter. The 

 cirri are marginal, usuallj^ in a single row, rarely in 2 rows. 

 97298—31—26 



