80 BULLETIN 84, UNITED STATES NATIONAL MUSEUM. 



However, it must be noted that 0. nodosa comes from a depth (1,525 fathoms), 

 where 0. anomala has never been found. 



0. anomala is known from the Arctic regions of Europe and on the coasts of 

 North America; it has been found chiefly in the waters of Nova Scotia in about 100 

 to 130 fathoms. According to the indications of the stations which I have given 

 above, it will be seen that the Albatross has taken 0. anomala in more southern 

 stations, between 42 and 31 north latitude. According to Lyman, 0. anomala 

 occurs in a depth of 524 fathoms, but the determination is doubtful. 



OPHIACANTHA ASPERA Lyrnan. 



See for bibliography: 



Verrill (99), p. 44. 

 Kcehler (07), p. 316. 



Albatross station 2159. Apr. 30, 1884. Lat. 23 10' 39" N. ; long. 82 20' 08" 

 W.; 98 fathoms; co. Two specimens. 



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

 W.; 196 fathoms; co.; temp. 71.9 F. One specimen. 



Albatross station 2167. May 1, 1884. Lat. 23 10' 40" N.; long. 82 20' 30" 

 W.; 201 fathoms; co. Two specimens. 



Albatross station 2335. Jan. 19, 1885. Lat. 23 10' 39" N.; long. 82 20' 21" 

 W.; 204 fathoms. One specimen. 



Albatross station 2342. Jan. 19, 1885. Lat. 23 10' 39" N.; long. 82 20' 21" 

 W.; 201 fathoms; co. Two specimens. 



Blake; 2 miles E. off Havana; 200 fathoms. Two specimens. 



The diameter of the disk does not exceed 5 mm. in general ; the arms are rarely 

 preserved, except on one of the examples from Havana. 



Lyman's description has been completed and rectified by Verrill, and the 

 specimens are quite in accordance with those of the latter naturalist, as well as 

 those I mentioned in 1907. The species is well characterized and easily to be 

 detected. 



0. aspera has been met with in various localities of the West Indies between 

 73 and 262 fathoms. 



OPHIACANTHA BIDENTATA (Retziui). 



Plate 8, figs. 3-4. 

 See for bibliography: 



Kcehler (09), p. 184. 

 Mortensen (10), p. 274. 

 Grieg (10), p. 5. 

 Kcehler(13a), p. 14. 



St. Augustine, Florida. No depth mentioned. One dry specimen. 



The oral papillae show the usual arrangement. 



I have had quite recently occasion (13a, p. 14) to speak of the variations which 

 the oral papillae of 0. bidentata may present in their number, as well as in their 

 arrangement, when studying the specimens which Charcot had gathered in the 

 northern regions of European seas. The examination of certain specimens of 0. 

 bidentata shows how difficult, and at the same time how dangerous, it is to establish 



