124 BULLETIN 84, UNITED STATES NATIONAL MUSEUM. 



Family OPHIOSCOLECIDiE. 



OPHIOSCOLEX GLACIALIS MUllet and Troschel. 



See for bibliography: 



Koehler (09), p. 198. 



Grieg (10), p. 6. 



Mortensen (10), p. 274. 



Sussbach and Breckner (11), p. 259. 



Albatross station 2092. Sept. 20, 1883. Lat. 39° 58' 35" N.; long. 71° 00' 

 30" W.; 197 fathoms; gn. m.; temp. 45° F. One specunen. 



The upper face of the disk has been torn away, but the rest of the specimen is 

 in a very good condition and is perfectly well characterized. The diameter of the 

 disk must have been from 22 to 24 mm. The specimen is quite in conformity with 

 those of the European seas with which I have been able to compare it. Certain 

 articles of the bases of the arms exceptionally carry four spines, but I observe the 

 same peculiarity in some examples from the Norwegian coasts. There can be no 

 possibihty of confusmg this specunen with 0. qtuidnspinus Verrill, which was 

 foimd in Nova Scotia, and which is at once distinguishable from 0. glacialis through 

 the presence of a tentacular scale. 



An individual in a very bad state, from stations 2582-83 and associated with 

 numerous Ophiocten Imstatum and Ophioglypha sarsii, undoubtedly belongs to the 

 same species. 



OPHIOLEPTOPLAX ATLANTICA, new species. 

 Plate 1.5, figs. 6-7. 

 Albatross station 2659. May 3, 1886. Lat. 28° 32' N.; long. 78° 42'; 509 

 fathoms; br. for.; temp. 45.2° F. One specimen. 

 Type.— Cat. No. 32304, U.S.N.M. 



The specimen is, mifortunately, incomplete and the upper face of the disk has 

 been completely torn away; judging by the traces left on the upper face of the arms, 

 the diameter of the disk must have been 12 mm. or thereabout. The diameter 

 of the circle formed by the external sides of the mouth shields is 5.5 mm. The 

 arms are incomplete and the longest is preserved to a length of only 30 nun.; they are 

 flattened and about 2.5 mm. wide. 



The mouth shields, which are not very large, are triangular, wider than long, 

 with an obtuse proximal angle and a convex distal side. The adoral plates, large 

 and wide, are extremely elongated and four or five times longer than wide, but their 

 edges are not absolutely parallel; they are, in fact, somewhat widened in their 

 internal third part, become narrower at the level of the oral tentacular pore, which 

 is very large, and then grow a little wider again outwardly, where they broadly 

 separate the mouth shield from the first lateral brachial plate. The oral plates are 

 large, fairly wide, and elongated; on their free edges each of them carries four rather 

 large, conical, and pointed papillaj, lying fairly apart from one another; the most 

 external of these is located near the oral tentacular pore and is longer than the others. 

 The teeth and the tooth papillse are shaped lilce the mouth papUlas; they are not all 

 preserved, but they seem to me to amount to five; tlu-ee are found on a lower level 

 and represent especially tooth papillae, the other two, larger, are superposed and 

 they correspond to two teeth. The mouth pieces are covered with fine granulations, 

 rounded and loosely placed. 



