170 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



length so that the fourth and those immediately succeeding are from about as long 

 as the median width to half again as long as the basal width. The second-seventh 

 or -eighth segments are centrally constricted with expanded distal ends, this expan- 

 sion of the ends being especially marked dorsally so that the dorsal profile of the 

 cirri is rather strongly serrate, but this dies away distally so that after about the 

 tenth segment the dorsal profile becomes smooth and straight. The fifth is a more 

 or less marked transition segment. The cirri are basally rounded in cross section, 

 later becoming laterally compressed, the distal portion consequently appearing 

 broader in lateral view. The opposing spine is prominent, central hi position, and 

 in height does not reach one-half the width of the penultimate segment. The termi- 

 nal claw is longer than the penultimate segment and is abruptly curved basally. 



The five arms are 45 to 65 mm. long. The IBr 2 and the fifth and following 

 brachials have the distal edge produced and overlapping and scalloped, the scallops 

 being composed of groups of fine spines, so that the proximal portion of the arms is 

 strongly serrate in lateral view. After the proximal third of the arms these scallops 

 merge into a uniformly finely spinous distal edge. The brachials have a narrow 

 and distinct, though low and rounded, median carination, which is most prominent 

 in the basal third of the arms. 



The proportions of the lower pinnules are the same as in E. individus, but they 

 have the distal ends on the dorsal side very strongly produced giving them a strongly 

 serrate profile, this feature being especially marked on those pinnules that are 

 enlarged. 



Notes. The largest specimens collected by Dr. Th. Mortensen off Jolo in about 

 46 meters have the arms 45-55 mm. in length; the cirri have 14-16 segments, of 

 which the longest are only slightly longer than broad to half again as long as broad at 

 the base. P! has 11 or 12 segments. 



One of the specimens from the Danish Expedition to the Kei Islands station 24 

 has the arms 60 mm. long; the other two are smaller. 



One of the specimens from the Danish Expedition to the Kei Islands station 26 

 has the arms about 45 mm. long. The cirri have 12 segments. The brachials have 

 a narrow and distinct, though low and rounded, carination which is most prominent, 

 in the basal third of the arms. The IBr 2 (second postradial ossicle) and the lower 

 brachials have produced and everted distal ends so that the basal portion of the 

 arms is strongly serrate in lateral view. The fifth and following 1 brachials (the 

 seventh and following ossicles beyond the radials) have the distal edge produced and 

 overlapping and scalloped, the scallops being composed of groups of fine spines. 

 After the proximal third of the arms these scallops merge into a uniformly finely 

 spinous distal edge. 



The specimens from the Danish Expedition to the Kei Islands station 53 have 

 the arms up to 65 mm. in length. Those from station 54 also have the arms up to 

 65 mm. long. 



The specimen from Siboga station 310 has the cirri XIX, 14-15 (usually the 

 latter), 10 mm. long. The first segment is short and those following gradually 

 increase in length so that the fourth and those succeeding are about as long as the 

 median width. In the longest cirri the fifth-eighth may be one-third again as long 

 as the basal width. The fourth-seventh or -eighth segments are centrally con- 



