12 BULLETIN 84, UNITED STATES NATIONAL MUSEUM. 



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

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



Fish Hawk station 7295. Feb. 26, 1902. Lat. 24 21' 45" N.; long. 81 47' 

 45" W.; 122 fathoms; co.; temp. 19.5 C. One specimen. 



0. secundus has been found by the Blake at Santa Cruz and various other 

 places in the West Indies, between 60-150 and 1,131 fathoms. 



OPH10GLYPHA CONVEXA Lyman. 



Plate 2, figs. 5-6. 

 See for bibliography: 



Koetler (09), p. 149. 



Albatross station 2097. Oct. 1, 1883. Lat. 37 56' 20" N.; long. 70 57' 

 30 "W.; 1,917 fathoms; glob. oz. Six specimens. 



Albatross station 2098. Oct. 1, 1883. Lat. 37 40' 30" N.; long. 70 37' 

 30" W. ; 2,221 fathoms; glob. oz. Seventeen specimens. 



The diameter of the disk ranges between 10 and 15 mm. 



I have already referred * to the variations which this species may offer and which 

 I myself have ascertained after Lyman. When the upper plates of the disk become 

 more numerous, the specimens may display some characters which recall those of 0. 

 SwZZato Wyville Thomson and, in this connection, I must particularly refer to two speci- 

 mens from station 2098. In one of them, the diameter of the disk of which reaches 

 only 12 mm., the upper plates are not so numerous as usual, but the six primary 

 plates are separated from one another in each interradial space by two successive 

 little plates, an arrangement which has not yet been reported in 0. convexa; the 

 two radial shields of each pair are also isolated from each other by a row of small 

 plates. In the other specimen, the diameter of the disk of which is 15 mm., the 

 radial shields are also separated on their whole length and the upper plates of the 

 disk are fairly numerous. This arrangement, in such specimens as undoubtedly 

 belong to 0. convexa, makes a transition to 0. bullata to which, in other respects, 

 0. convexa is closely allied. 



But whatever may be the variations in the arrangement of the upper plates 

 of the disk, the radial comb always consists of low, short, and rectangular papillae, 

 as I have indicated in my paper on the Echinoderms of the Princesse-Alice (09, pi. 25, 

 figs. 1 and 2). Besides, I shall refer again to the characters of 0. convexa when 

 studying the following species, which is very closely allied to it. 



OPHIOGLYPHA CORONATA, new species. 



Plate 2, figs. 3-4-. 

 ? Ophioglypha convexa LYMAN (83), p. 247. 



Albatross station 2750. Nov. 27, 1887. Lat. 13 30' N.; long. 63 31' W.; 

 496 fathoms; glob, oz.; temp. 36.8 F. Two specimens. 



Type.C&t. No. 32290, U.S.N.M. 



The diameter of the disk is respectively 10.5, and 12 mm.; one of the arms, 

 apparently entire, of the larger specimen, measures 25 mm. 



' fechinodermes provenant des campagncs du yacht Princess Alice, 1909, p. 150. 



