A MONOGRAPH OF THE EXISTING CRINOIDS 223 



first syzygial pair (composed of brachials 3 + 4) is about as long as broad. The fol- 

 lowing 5 brachials are short discoidal, the next 2 short wedge-shaped, and those 

 succeeding moderately long and triangular. In the distal half of the arms the 

 brachials again become short wedge-shaped. 



The first syzygy is between brachials 3 + 4, and the second is from between 

 brachials 12 + 13 to between brachials 15 + 16. The distal intersyzygial interval is 

 usually 4 or 6 (commonly 4) muscular articidations. 



Pi is flagellate, apparently about 15 mm. long, composed of short segments which 

 are not at all or only sparsely and finely spinous. The 5 basal segments are broad 

 and triangular and are only in contact over a small portion of their ends. P2 is 

 similar, but somewhat shorter. P3 is markedly shorter. The comb of the proximal 

 pinnules is moderately long and well developed, with about 14 low and widely sepa- 

 rated teeth. 



Localities.— Bah&nms [A. H. Clark, 1921] (1, U.S.N.M., 36164). 



Dry Tortugas, Florida; less than 0.9 meter [Nutting, 1895; Springer, 1902, 1903; 

 H. L. Clark, 1918J (2, U.S.N.M., 34496). PI. 18, figs. 40, 41. 



7Blake stations 155-156; off Montserrat (lat. 16° 41' 54" N., long. 62° 13' 24" 

 W.); 161 meters; temperature 20.56° C; January 16, 1879 [Hartlaub, 1912]. 



Montserrat, Dominica or Martinique {Blake stations 155, 177, or 203) [Hartlaub, 

 1912] (1 M. C. Z., 429, part; the other specimens are discoidea). 



Blakestation 171 ; off Guadeloupe (lat. 15° 58' 20" N., long. 61° 43' 12" W.); 334 

 meters; temperature 13.05° C. ; lava sand and ooze; January 22, 1879 [Hartlaub, 1912]. 



Dominica; A. H. Verrill [A. H. Clark, 1921] (1, Y. M.). 



University of Iowa's Barbados-Antigua expedition station 53; Barbados [A. H. 

 Clark, 1921] (arms, U. I. M.). 



University of Iowa's Barbados-Antigua expedition station 97; Barbados [A. H. 

 Clark, 1921] (arms, U. I. M.). 



University of Iowa's Barbados-Antigua expedition station 98; Barbados [A. H. 

 Clark, 1921] (arms, U. I. M.). 



University of Iowa's Barbados-Antigua expedition station 99; Barbados [A. H. 

 Clark, 1921] (arms, U. I. M.). 



University of Iowa's Barbados-Antigua expedition station 100; Barbados [A. H. 

 Clark, 1921] (arms, U. I. M.). 



University of Iowa's Barbados-Antigua expedition; Engineers' Pier, Barbados; 

 5.7 meters [A. H. Clark, 1921] (1, U. I. M.). 



University of Iowa's Barbados- Antigua expedition; Barbados [A. H. Clark, 1921] 

 (arms, U. I. M.). 



Blake; Caribbean Sea [P. H. Carpenter, 1888]. 



Erroneous locality.— Bermudas [A. H. Clark, 1918; H. L. Clark, 1921]. This.is 

 an error for Bahamas. 



Geographical range. — From the Bahamas and the Dry Tortugas to Barbados. 



Bathymetrical range. — Littoral, and down to 334 meters; most of the specimens 

 are from shallow water. 



Thermal range.— Tharv arc 2 records, 13.05° C. and 20.56° C. 



