OPHIUEANS OF UNITED STATES NATIONAL MUSEUM. 43 



it with O.jllogranea (75, p. 21), from wliich ho distin<juishcs it chiefly by the shape 

 of the oral papillae. Ljungmau's description is fairl}' complete, but it -nill not be 

 useless to insist on tlie differences wliich separate the two species, since O.Jilogranea 

 is found in the collections gathered by tlie Albatross. 



Ljungman's type is presei-ved in the Stockholm Museum and I have been able 

 to study it, thanks to the kindness of Professor Th^el. It is represented onlv by a 

 single specimen from Rio de Janeiro; the disk is 6 mm. in diameter and the arms are 

 from 30 to 32 mm. long; they are consequently much shorter than in O.jllogranea. 



Tlie upper face is covered with fairly large plates wliich are unequal and 

 polygonal, without the slightest indication of primary plates. The radial shields 

 are triangular, one and a half times longer tlian wide and not twice so, as stated 

 by Ljungman; they are contiguous only on half their length and proximally 

 remain separated bj^ a fairly wide triangular space, wliich is beset by a few plates. 

 The spines do not appear until on the margin of the disk, as is also the case with 

 O.Jilogranea, but they extend over the whole under face, wlulst in the latter species, 

 they cover only a peripheric triangular area wliich is more or less reduced. The 

 mouth sliielils are about as long as wide and even a little wider than long; they are 

 lozenge-shaped with a truncatcil distal angle. The adoral plates are rather tliick, 

 and wider outwardly tlian inwardly. The three oral papillae are flattened and they 

 all come up to the same height, but the external pajnlla is •wider than the others. 

 These various characters of the mouthpieces clearly separate 0. loveni from O.Jilo- 

 granea. Finally, the upper brachial plates are less wide in the former than in the 

 latter species and their sliape is rather triangular with an obtuse and rounded 

 proximal angle; the under plates are plainly pentagonal with an obtuse proximal 

 angle instead of being rectangular as in O.Jilogranea. 



OPmOCNmA SCABRIDSCULA (LUIken). 



See for bibliography : 



Verrill (99a), p. 317. 



Key West, Florida. 1885. Eight specimens. 

 Diameter of disk included between 4 and 6 mm. 



AMPHILIMNA OLIVACEA (Lyman). 



See for bibliography : 

 Verrill (99a), p. 318. 



Albatross station 2646. Apr. 9, 1886. Lat. 2.5° 47' X.; long. 80° 05' W.; 

 85 fathoms; gy. s. for. Twelve specimens. 



The arms wliich are very long, are broken in pieces. The diameter of the 

 disk generally ranges between 5 and 10 mm., and in two specimens it docs not 

 exceed 3 mm. 



A. olivacea was formerly classified in the genus Ofhiocnida from which it was 

 removed in 1899 by Verrill who made it the type of liis new genus AmphUimna. 



This species has been met with at several places off the eastern coast of the 

 United States; it extends from Marthas Vineyard as far down as the coasts of 

 Florida and appears also in the West Indies. It lives between 40 and 192 fathoms. 



