PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 673 



abruptly, causes the distal eud to appear about twice the diameter of the remainder of 

 the segment. 



Pa is 4 mm. long, considerably stouter than Pi and tapering evenly from the base 

 to the tip, with 10 segments, of which the first 3 are about as long as broad and those 

 following become progressively elongated. The distal ends of the segments are not 

 especially prominent. 



P3 is of about the same length, but rather stouter, especially distally, and much 

 stiffer, with 10 segments, of which the first is not so long as broad, the second and third 

 are about as long as broad, and the following become progressively elongated. The 

 fourth, fifth, sixth, and pro.xnnal half of the seventh bear a large gonad. 



The following pinnules to P7 or Ps are similar, but slowly become longer and stouter. 

 After P9 the pinnules develop more or less centrally constricted segments with prominent 

 distal ends, showing more or less of a contrast with the smoother genital pinnules. 



The distal pinnules are 6 mm. long, with the first segment short and wedge-shaped, 

 the second about as long as broad, slightly trapezoidal, and the remainder much elon- 

 gated with prominent articulations and protruding distal ends. 



P^ may be similar to P,, or it ma.y be of the same character but twice as long. 



[Note by A.M.C] In 1912 Hartlaub pubhshed a description of Pourtal^s' type 

 specimen of this species. There are some differences between this and the foregoing 

 description which should be noted. The cirrus sockets are given as numbering 70 to 80. 

 Also the pro.-dmal pinnules appear to have many fewer segments though thej- are similar 

 in length to those described above. P, has about 12 segments and measures 7 mm. Pa 

 is shorter with 8 segments. P3 is similar in size and bears a gonad. Though Pourtalte 

 might not have recognized an incomplete pinnule it is unlikely that Hartlaub would not. 

 It seems to me that the discrepancy in the segments of Pi is too great to be accounted 

 for by variation alone and a reexamination of the specimens involved is called for. 



Localities. — Albatross station 2400; Gulf of Mexico, southeast of Pensacola, Florida 

 (lat. 2S°41'00" N., long. 86°07'00" W.); 309 metei-s; March 14, 1885 [A. H. Clark, 

 1918] (fragments, U.S.N. M., 1G910). 



Bibb station 139P; off Cojima, near Havana, Cuba; 823 meters, March 4, 1869 

 IPourtal^, 1869, 1878; P. H. Carpenter, 1881, 1888; Hartlaub, 1912]. Type locality. 



Albatross station 2601; between the Bahamas and Cape Fear, North Carolina (lat. 

 29°16'30" N., long. 79°36'30" W.); 801 meters; temperature 7.50° C; May 4, 1886 

 [A. H. Clark, 1918] (1, U.S.N. M., 14701). 



Albatross station 2663; between the Bahamas and Cape Fear (lat. 29°39'00" N., 

 long. 79°49'00" W.); 770 meters; temperature 5.95° C; May 4, 1886 fA. H. Clark, 1918] 

 (5, U.S.N.M., 14700, 14711). 



Albatross station 2415; between Savannah, Georgia, and Cape Charles (lat. 30° 

 44'00" N., long. 79°26'00" W.) ; 805 meters; temperature 7.56° C; April 1, 1885 [A. H. 

 Clark, 1918] (23, U.S.N. M., 14707, 34608). 



Albatross station 2666; between the Bahamas and Cape Fear (lat. 30°47'30" N., 

 long. 79°40'00" W.) , 494 meters; temperature 9.05° C; May 5, 1886 [A. H. Clark, 1918] 

 (15, U.S.N. M., 14703, 22678). 



Albatross station 2667; between the Bahamas and Cape Fear (lat. 30°53'00" N., 

 long. 79°42'30" W.); 500 meters; temperature 9.28° C; May 5, 1886 (4, U.S.N.M., 

 14704). 



