OPHIURANS OF UNITED STATES NATIONAL MUSEUM. 21 



entire length by a wedge of smaller and larger scales." The same contradiction 

 is found, besides, in Lyman's preliminary work (78, p. 70). I consider Lyman's 

 description correct and it is in accordance with the figures he published in 1878 and 

 1882, and the diagnosis must be corrected in the direction I have just indicated. 



As a rule, the two radial shields of each pair are in. contact through their distal 

 angle in 0. ljungmani; however, it happens sometimes that these shields are some- 

 what separated from one another distally, but they are always more closely put 

 together than in 0. lepida, where they remain widely distant from one another. 

 As regards the plates of the upper face of the disk, the drawing published by Lyman 

 in 1878 (78, pi. 3, fig. 72) seems to me to be more correct than that of the Reports 

 of the Challenger (82, pi. 4, fig. 3). I may add that 0. lepida possesses a supple- 

 mentary radial comb similar to that of 0. ljungmani, to which I shall refer when 

 studying the latter species. 



In short, 0. lepida and 0. ljungmani are extremely cognate, but the former 

 species is, nevertheless, easily distinguished by its larger size, by the upper plates 

 of the disk being much smaller, almost uniform and finer, by the radial shields 

 being widely separated, and by the upper brachial spine being rather short. These 

 characters are never found in 0. ljungmani. 



The Challenger encountered 0. lepida at various stations between 38 and 

 40 N., and 27 and 72 W., in depths ranging from 750 to 1,350 fathoms, and 

 also at 8 S. and 14 W. (420 fathoms). The Blake met with it in the West Indies, 

 and also at several more northern localities (41 N., 65 W.; 39 N., 70 W., etc.), 

 in depths ranging from 608 to 1,242 fathoms. 



OPHIOGLYPHA LJUNGMANI Lyman. 



See for bibliography : 



Ophioglypha ljungmani K<EHLER (06), p. 263. 

 Ophioglypha ljungmani KXEHLER (09), p. 152. 

 Ophioglypha thouleti KCEHLER (00), p. 158. 



Albatross station 2102. Nov. 5, 1883. Lat. 38 44' N.; long. 72 38' W.; 

 1,209 fathoms; glob, oz.; temp. 39 F. Four specimens. 



Albatross station 2358. Jan. 29, 1885. Lat. 20 19' N.; long. 87 03' 30" W.; 

 222 fathoms; fne. wh. co. One specimen. 



Albatross station 2639. Apr. 9, 1886. Lat. 25 46' 30" N.; long. 80 02' W.; 

 56 fathoms; co. s. One specimen. 



Albatross station 2642. Apr. 9, 1886. Lat. 30 47' 30" N.; long. 79 49' W.; 

 270 fathoms; gy. s.; temp. 42.6 F. One specimen. 



Albatross station 2644. Apr. 9, 1886. Lat. 25 40' N.; long. 80 00' W.; 

 193 fathoms; gy. s.; temp. 43.4 F. Five specimens. 



Albatross station 2645. Apr. 9, 1886. Lat. 25 46' 30" N.; long. 80 02' W.; 

 157 fathoms; gn. s.; temp. 43.4 F. Some specimens. 



Albatross station 2666. May 5, 1886. Lat. 30 47' 30" N.; long. 79 49' W.; 

 270 fathoms; gy. s.; temp. 48.3 F. Seven specimens. 



Albatross station 2667. May 5, 1886. Lat. 30 53' N.; long. 79 42' 30" W.; 

 273 fathoms; gy. s. bk. sp.; temp. 48.7 F. Five specimens. 



Albatross station 2668. May 5, 1886. Lat. 30 58' 30" N.; long. 79 38' 

 30" W.; 294 fathoms; gy. s. dd. co.; temp. 46.3 F. One specimen. 



