498 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Syzygies occur between brachials 3+4, again about 9 + 10 (from 6 + 7 to 13 + 14), 

 and distally at intervals of 3 or 4 muscular articulations. 



P! is 7 mm. long, very much compressed, composed of about 12 segments all of 

 which are much longer than broad, especially the distal which are excessively elongated. 

 P 2 is 12 mm. long, much stouter than P 1; with 16 segments, of which the first is about 

 half again as long as broad and the following become progressively elongated ; the first 

 4 segments are comparatively broad and much flattened, those following being more 

 slender and more nearly cylindrical. ?4 is 7 mm. long with 12 segments, stout at the 

 base like P 2 but rapidly tapering; the first segment is not quite so long as broad, the 

 second is about as long as broad, and the following rapidly become elongated. The 

 distal pinnules are 16 or 17 mm. in length; the first segment is about 3 times as broad 

 as long, trapezoidal, the second is nearly as long as broad, also trapezoidal, and the 

 third and following are slender and cylindrical, greatly elongated, with the distal edges 

 armed with a few slender spines. There are 18 to 20 segments in the distal pinnules. 



Localities. Blake station 222; off St. Lucia, British West Indies (lat. 1358'37" 

 N., long. 6104'45" W.); 771 meters; temperature 5.83 C.; sand and ooze; February 

 16, 1879 [P. H. Carpenter, 1881; Hartlaub, 1912] (specimen lost). Locality of original 

 type. 



Albatross station 2400; Gulf of Mexico, southeast of Pensacola, Florida (lat. 

 2841'00" N., long. 8607'00" W.); 308 meters; gray mud; March 14, 1885 (arm 

 fragment, U.S.N.M., 34570). 



Albatross station 2663; off northern Florida (lat. 2939'00" N., long. 7949'00" 

 W.); 769 meters; temperature 5.95 C.; brown sand; May 4, 1886 [Hartlaub, 1912] 

 (3, U.S.N.M., 34630, 34633). Locality of neotype. 



Albatross station 2415; off Savannah, Georgia (lat. 3044'00" N., long. 7926'00" 

 W.); 804 meters; temperature 7.56 C.; coral, coarse sand, shells and foraminifera ; 

 April 1, 1885 (7, U.S.N.M., 22668, 34569, 34571, 36141, 36249). 



Albatross station 2416; off Georgia (lat. 3126'00" N., long. 7907'00" W.); 504 

 meters; temperature 12.11 C.; coarse broken shells; April 1, 1885 (1, U.S.N.M., 

 36214). 



Geographical range.- From St. Lucia to Pensacola, Florida, and the coast of 

 Georgia. 



Bathymetrical range. From 308 to 804 meters; the average of 5 records is 631 

 meters. 



Thermal range. From 5.83 C. to 12.11 C.; the average of 4 records is 7.86 C. 



History.- In his preliminary report (1881) on the comatulids collected by the Blake, 

 Dr. P. H. Carpenter mentioned as a new species Antedon columnaris. Later in the 

 same paper he said: 



The peculiarities of Antedon columnaris are almost sufficiently obvious in Fig. 8. I can find no 

 traces on its columnar centrodorsal of any sutures which would indicate its composition out of two or 

 more anchylosed joints. In fact the alternating arrangement of its cirrhus sockets indicates the 

 improbability of such an anchylosis. They are disposed in five double rows separated by inter- 

 radial ridges, at the tops of which minute basals [the ends of the basal rays] are visible, just as in 

 Pentacrinus [Cenocrinus] asteria. The lower end of the column is somewhat concave, but appears 

 to be completely closed and devoid of any central perforation. The loose arms obtained with the 

 calyx are rather large and massive, and resemble those of Atelecrinus in having the ambulacrum close 

 down upon the top of the large muscular bundles. 



In the Challenger report in 1888 Carpenter gives this species from off St. Lucia in 



