260 THE VOYAGE OF H.M.S. CHALLENGER. 



three times the height of the radials, and closely fused, so that their sutures are rarely 

 visible. Eadials short and quadrate, with concave upper and convex lower edges ; usually 

 five in number, but sometimes four, six, or seven. Arms of from thirty to forty joints, 

 which are imited in pairs by syzygies. First brachials flattened, and quite free laterally, 

 square or slightly longer than broad. The second similar, but somewhat shorter. The 

 third still shorter and trapezoidal, so that the arm narrows considerably at this point. 

 The remaining joints as long or a little longer than wide, and more convex than the 

 preceding ones. The epizygals which bear the pinnules are rather longer than the 

 hypozygals and irregularly pentagonal, as the pinnule facets are large relatively to the 

 length of the joints. The first pinnule is on the eighth brachial or fourth epizygal. The 

 two lowest pinnule-joints are somewhat trapezoidal in shape, and in contact by their broader 

 ends. The remaining joints have a medio-dorsal keel and flattened sides, with the edge 

 of the ventral furrow produced upwards into broad thin plates, especially in the thiixl 

 and following joints. The peristome is at the level of the second brachial, and protected 

 by five linguiform oral plates which occupy the central ends of the interpalmar areas. 



Colour, in spirit, brownish-white or greyish-white. 



Localities. — The Lofoten Islands, 80 to 300 fathoms ; the Josephine Bank. 



H.M.S " Lightning," 1868. Station 12. Lat. 59° 36' N., long. 7° 20' W. ; 530 fathoms; 

 Globigerina ooze; bottom temperature, 4 7° "3 F. Three small specimens without arms. 



Station 16. Lat. 61° 2' N., long. 12° 4' W.; 650 fathoms; Globigerina ooze. Two 

 small specimens without arms. 



Stem-fragments were occasionally found in the " cold area " during the cruises of the 

 " Lightning " and " Porcupine." 



H.M.S. Challenger. Station 24a. March 25, 1873, ofi" Culebra Island; lat. 18° 43' N., 

 long. 65° 5' W. ; 625 fathoms; Pteropod ooze. Two specimens. 



Station 122c. September 10, 1873, off'Barra Grande ; lat. 9° 10' S., long. 34° 49' W. ; 

 400 fathoms ; red mud. Two specimens. 



Station 323. February 28, 1876 ; lat. 35° 39' S., long. 50° 47' W. ; 1900 fathoms; 

 blue mud; bottom temperature 33°'l F. The occurrence of a stem-fragment here is 

 recorded in the Station-book, but it has not come into my hands, and I am therefore 

 unable to speak positively about it. 



H.M.S. "Knight Errant," 1880. Station 5. Lat. 59° 26' N., long. 7° 19' W.; 515 

 fathoms ; mud ; bottom temperature, 45°"4 F. Two young specimens without arms. 



Station 6. Lat. 59° 37' N., long. 7° 19' W. ; 530 fathoms; grey mud; bottom 

 temperature, 46°*5 F. A fragment only. 



Rhizocrinus lofotensis has also been dredged several times by the surveying ships of 

 the U. S. Coast Survey, as recorded in the following list. 



SS. "Bibb," May 4, 1868, off the Samboes; 237 fathoms. May 11, 1868, off Sand Key; 248 and 306 

 fathoms. March 4, 1869, off Cojima, near Havana; 450 fathoms; and several times at lesser depths. 



