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 articulations. 



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. P 2 is 

 similar, but somewhat shorter. P 3 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. Bahamas [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, 1918] (2, U.S.N.M., 34496). PI. 18, figs. 40, 41. 



IBlake 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). 



Blake station 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. There are 2 records, 13.05 C. and 20.56 C. 



