76 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



long \\ itli about 14 segments of which the firs! and second arc shorter and a little coarser 

 than those following, which arc twice as long as broad. 



The disk is a little incised with large calcareous granules, 4 mm. in diameter. 



The color is light yellow-brown, the disk brown. 



Gislen said thai after comparison with specimens from Dr. Mortensen's collection 

 he is convinced that this species often lias 1 1 or 12 arms up to 70 mm. long. The IIBr 

 scries are 2. Pi may have 15 segments and reach a length of about 6 mm. P 2 to P I0 

 are short with the live or six proximal segments somewhat thickened in dorsal view. 



He remarked that in the short genital pinnules the species has an unusual resem- 

 blance to a spider, hence the name. 



In 1927 Professor Gislen published notes on the specimens from Mortensen's 

 station 7 to which he referred in the original description. Of the first specimen he said 

 that the centrodorsal is almost hemispherical, 3.0 mm. in basal diameter and 2.0 mm. 

 across the slightly convex dorsal pole. The cirrus sockets are arranged in 10 columns, 

 1 or 2 to a column. 



The cirri are XIII, 19-22, from 13 to 15 mm. long. The sixth or seventh is a 

 transition segment, three-quarters again as long as the distal width, with the first 

 dorsal spine protruding from the distal part. 



The IBri are five times as broad as long with a well delimited median carination 

 which continues on to the proximal part of the IBr 2 (axillary). The IIBr series are 2. 

 The ossicles of the IBr and IIBr series have a slightly everted proximal border and two 

 or t line small pits on each side of the low median carination. 



The 1 1 arms are 70+ mm. long. The low median carination on the division series is 

 continued out to the distal parts of the arms. The distal brachials have slightly everted 

 distal borders and a rather strong median carination. 



The distal intersyzygial interval is from 4 to 9 (usually 5 or 6) muscular 

 articulations. 



P, is 6.5 mm. long with 13-14 segments. P 2 is 4 mm. long with 8-10 segments. 

 P 3 is 3 mm. long with 7-9 segments. P 4 is 3 mm. long with 7 segments. P 7 is 4 mm. 

 long. The distal pinnules are 8 mm. long with 18 segments. The disk is 5 mm. in 

 diameter. 



In a second specimen from the same station the cirri are XVII, 22-23, 13-16 mm. 

 long, in 11 columns. The 12 arms are 70+ mm. long. The dorsal carination is as in 

 the preceding specimen. P, is 5 mm. long with 14-16 segments. P 2 is 4.5 mm. long 

 with 1 1 segments. P 4 is 3.7 mm. long with 10 segments. The disk is 5 mm. in diameter 

 and bears coarse granules. The anal cone is 1.5 mm. high. 



A third specimen from the same station has the cirri XVI, 18-23, from 10 to 12 mm. 

 long, arranged in 10 columns. The arms, which are partly broken, were at least 11, 

 and are 60 mm. long. P, is 4.5 mm. long with 12 segments. P 3 is 2.5 mm. long with 

 7 segments. The distal pinnules are 6 mm. long with 12 segments of which the longest 

 are from two to two and one-half times as long as broad. 



In his original description Gislen said that this supposed new species most closely 

 resembles Glyptomrtra lata from which, however, it differs sharply by the cirri, very 

 short in comparison with the arm length, but in spite of this with relatively many seg- 

 ments; by the rather smooth proximal arm parts; and, above all, by the proximal pin- 

 nules which have few and rather long segments. 



