14 BULLETIN S2, UNITED STATES NATIONAL MUSEUM 



the outermost axillary. Like the division series, the arms are smoothly rounded 

 dorsally. The fiist 10 brachials are almost square, those following to about the 

 fifteenth are broader than long, the succeeding are very bluntly wedge-shaped, and 

 the distal are more discoidal. 



The fiist syzygy is between brachials 3+4, the second is at about the fortieth 

 brachial, and those followmg occur at intervals of 11-15 muscular articulations. 



P, on the outer arms is by far the longest pmnule; it is slender and flagellate, 

 about 35 mm. long with 41-46 segments. On the inner arms Pi reaches at the most 

 from one-fourth to one-third its length on the outer arms. P2 is very short, only 

 about 4 mm. long. The pmnules following remam of about the same length, later 

 slowly increasing up to 23 mm. in the distal portion of the arms. 



The diameter of the disk is almost 50 mm. The color is dark red-brown. 



Professor Koehler said that the specimen from the Bay of Amboina studied by 

 him had the arms 170-180 mm. long. The color was deep purple, almost black. The 

 specimen agreed absolutely with Hartlaub's description. It showed especially the 

 considerable differences between the pinnules on the outermost and on the inner arms 

 of each IIIBr series as described by Hartlaub. 



The specimen from the pier at Amboiua is a magnificent example of the species 

 with 20+16+18+17 + 18=89 arms. 



The specimen collected by the Willebrord Snellius at Amboina on September 17, 

 1930, has 15+18+15 + 12 + 14 = 74 arms 180 mm. long. The cirri are 90-100 mm. 

 long with 75-79 segments. 



The specimen from Siboga station 310 is medium sized, with 53 arms about 140 

 mm. long. 



The specimen from the Danish Expedition to the Kei Islands station 111 consists 

 of a centrodorsal and arm bases, and a detached visceral mass; the cirri are XXXVIII, 

 63-70, up to 70 mm. in length. 



In one of the specimens from Singapore the cirri are XXXVI, 75-78 (the undevel- 

 oped cirri with 68-70 segments), from 70 to 80 mm. long. The first cirrus segment is 

 about three times as broad as long, and those following slowly increase in length to 

 the thirteenth or fourteenth, which is about as long as broad. The succeeding seg- 

 ments are similar, or become very slightly longer than broad. Somewhere between 

 the twenty-sLxth and twenty-ninth (rarely so early as the twenty-third) there is a 

 segment about as long as broad mostly dark with a dull smface like the segments 

 preceding, but becoming lighter and more pohshed distally, especially on the dorsal 

 side, like the segments succeeding. The following segments are at first very shghtly 

 broader than long, then gradually become shorter, the majority of the distal segments 

 being about twice as broad as long. The transition segment and those following bear 

 distally on the dorsal end a transverse ridge which is fiu-nished with usually 6 rounded 

 teeth; distally this ridge gradually becomes narrower, after about 20 segments 

 becoming merely a pair of teeth, and after about eight segments more a single dorsal 

 spine. With the decrease in width of the transverse ridge the dorsal surface of the 

 segments becomes more and more carinate, at first only in the distal portion, but 

 gradually more and more of the surface is involved so that, viewed laterally, there 

 appears to be a series of dorsal spines which at first rise sharply from the distal end 

 only, but later progressively mvolve more and more of the dorsal surface, at the same 



