114 BULLETIN 84, UNITED STATES NATIONAL MUSEUM. 



the brachial tentacular pores also seem to me longer and more slender than in the 

 latter species. 



The single existing sample of 0. gracilis being smaller than most of the 0. alberti 

 which I have studied, might induce one to think that some of the differences I 

 mention are due to the youth of the subject. I therefore took pains to compare 

 with the example from the Albatross the two specimens which were gathered in 1895 

 by the Princesse Alice, one of which is only 6 mm. across the disk. Now, this 

 young specimen already possesses on the tentacular mouth pore the three charac- 

 teristic papillae of 0. alberti with their usual shape; the brachial spines, amounting to 

 five, are short, fairly thick and always remain applied against the lateral faces of the 

 arms. The differences are absolutely striking between this specimen and my 

 0. gracilis. One will also notice that the latter species was dredged from a lesser 

 depth than 0. alberti. 



The drawings which I have published of 0. alberti being, of course, somewhat 

 schematic, I thought I had better reproduce here some photographs of a specimen 

 from the cruises of the TravaiUeur and the Talisman so as to illustrate more fully 

 the differences between the two species (pi. 12, figs. 3, 4). 



The form of the two papilla? carried by the tentacular mouth pore in 0. gracilis, 

 reminds one of the single papilla existing at this place in the genus Ophiomedea, 

 which I introduced in 1907; but in the latter genus this single papilla is much 

 stronger than in 0. gracilis, and the other mouth papillae are but three on each side; 

 the shape and arrangement of the tentacular brachial scales are, besides, quite 

 different in the two genera, and, although 0. gracilis recalls by some characters the 

 genus Ophiomedea, there can be no question about the latter belonging to the genus 

 Ophiotrema. 



OPmOCAMAX AUSTERA Verrill. 



Ophiocamax austera VERRILL (99), p. 60, pi. 6, figs. 1, la. 

 Ophiocamax austera VERRILL (99a), p. 355. 



Albatross station 2655. May 2, 1886. Lat. 27 22' N.; long. 78 07' 30" W.; 

 338 fathoms; gy. s.; temp. 47.5 F. Two specimens. 



Albatross station 2656. May 3, 1886. Lat. 28 08' N.; long. 78 28' W.; 

 540 fathoms; for.; temp. 41.2 F. One specimen in very bad condition. 



Albatross. Havana; no depth mentioned. Three specimens. 



The diameter of the disk varies between 8 and 14 mm.; the specimens are 

 rather well preserved though their arms are almost all broken, and they are quite 

 in accordance with Verrill's description. 



OPHIOCAMAX FASCICULATA Lyman. 



Ophiocamax fasdculata LYMAN (83), p. 265, pi. 7, figs. 92-94. 

 Ophiocamax fasciculate, KCEHLER (97), p. 360. 

 Ophiacamax fasdculata KCEHLER (99), p. 67. 

 Ophiocamax fasdculata KCEHLER (07), p. 316. 



Albatross station 2125. Feb. 8, 1884. Lat. 11 43' N.; long. 69 09' 30" W.; 

 208 fathoms; yl. m. s. bk. sp.; temp. 50.7 F. Several specimens. 



Albatross station 2129. Feb. 27, 1884. Lat. 19 56' 04" N., long. 75 48' 

 55" W.; 274 fathoms; bu. m. fne. s. Several specimens. 



