6 BULLETIN 84, UNITED STATES NATIONAL MUSEUM. 



I do not think that this species can be united with 0. januarii Liitken. I 

 have been able to compare with the numerous specimens of 0. brevispina whicli I 

 have been studying of late years, one of Liitken's two types which are preserved in 

 the Copenhagen Museum and which were most kindly lent to me by Doctor Mortensen. 

 It is undoubtedly quite a distinct form ; besides the fact that 0. januarii always 

 reaches a very large size (the diameter of the disk is 18 mm. in Liitken's types 

 and 17 mm. in Lyman's example), I notice that the characters indicated by Liitken 

 are very obvious, and the notches of the upper face of the disk at the beginning 

 of the arms are even still deeper than indicated on Liitken's drawing; the spines, 

 which are cylindrical, are almost as long as the article. To sum up, the differences 

 are important enough to justify the separation of the two species, between which 

 I have never observed any intermediate form. 



OPmODERMA CINEREA MUlIer and Troschel. 



(=Op}noderma antillarum Liitken.) 



See for bibliography: 



Verrill (99), p. 6. 

 H. L. Clark (01), p. 242. 

 Verrill (07), p. 325. 

 Koehler (07), p. 281. 

 Koehler (13), P- 354. 



Albatross station 2160. Apr. 30, 1884. Lat. 23° 10' 31" N.; long. 82° 20' 37" 

 W. ; 167 fathoms; co. One specimen. 



Albatross station 2166. May 1, 1884. Lat. 23° 10' 36" N.; long. 82° 20' 30" 

 W.; 196 fathoms; co.; temp. 71.9° F. Five specimens. 



Albatross station 2326. Jan. 17, 1885. Lat. 23° 11' 45" N".; long. 82° 18' 54" 

 W.; 194 fathoms; br. co.; temp. 62° F. One specimen. 



Albatross station 2330. Jan. 17, 1885. Lat. 23° 10' 48" N.; long. 82° 19' 15" 

 W.; 121 fathoms; fne. gy. co. Four specimens. 



Albatross station 2333. Jan. 19, 1885. Lat. 23° 10' 36" N.; long. 82° 19' 12" 

 W.: 169 fathoms; fne. wh. co. Two specimens. 



Albatross station 2334. Jan. 19, 1885. Lat. 23° 10' 42" N. ; long. 82° IS' 24" 

 W.; 67 fathoms; wh. co. Four specimens. 



Albatross station 2336. Jan. 19, 1885. Lat. 23° 10' 48" N.; long. 82° 18' 52" 

 W.; 157 fathoms; co. Two specimens. 



Albatross station 2341. Jan. 19, 1885. Lat. 23° 11' 00" N.; long. 82° 19' 06" 

 W. ; 143 fathoms; co. One specimen. 



Albatross station 2384. Mar. 3, 1885. Lat. 28° 45' 00" N.; long. 88° 15' 30" 

 W.; 940 fathoms; br. gy. m.; temp. 39.6° F. Eight specimens. 



Fisl Hawk station 7231. Jan. 23, 1902. Anclote. Lat. 28° 03' 30" N.; 

 long. 83° 10' W.; 10 fathoms; rky. c; temp. 13.5° C. Three specimens. 



Key West, Florida. Three specimens. 



New Providence, Bahamas. Three specimens. 



Port Castries, St. Lucia. One specimen. 



Abrolhos Islands, Brazil. Albatross, Dec. 27, 1887. Nine dry specimens, very 

 large and fine. The diameter of the disk ranges between 20 and 26 mm. 



