A MONOGRAPH OF THE EXISTING CBINOIDS 541 



oped cirri the segments are not longer than broad. There is a small blunt opposing 

 spine. 



Hartlaub described the cirri in this specimen as XL, 30, long and stout, arranged 

 in 3 rows on the centrodorsal. 



The radials are concealed. All of the division series beyond the IBr series are 

 4 (3 + 4). 



The 79 arms are 140 mm. long. The 5 rays bear 16, 15, 18, 15, and 15 arms. 

 The brachials are short. Under a glass it is seen that their surface is bedecked with 

 small longitudinal ribs which run to the distal edge and here end in overlapping 

 spinelets. 



The first brachial syzygy occurs between brachials 3 + 4 and the ne.xt after 

 18-32 muscular articulations. From this point onward the intersyzygial interval 

 is 4-8 muscular articulations. 



Pinnules occur on the second ossicle following each axillary. The end segments 

 of the first 5-7 pinnules possess on their inner side moderatel}' high overlapping fine 

 longitudinally grooved teeth, and those of most of the other pinnules 2 or more rows 

 of small recurved spinelets. 



The disk is 28 mm. in diameter. It bears a few scattered short blunt concretions. 

 The middle of the disk carries the long anal tube. The mouth Ues near the margin. 

 From it grooves run unsymmetrically to the arms. The division series as far as the 

 second or third are united by perisome. 

 The color in alcohol is brown. 



Doctor Willey's specimen from the Loyalty Islands is large. The cirri are XXIV, 

 21-22, smooth, stout, and well developed, arranged in 2 rows on the centrodorsal. 

 The outer IIIBr series are 2, all the other division series being 4 (3 + 4); VBr series 

 are present. 



The specimen from the South Seas has about 70 arms which are about 160 mm. 

 long. 



In the specimen from Jaluit the centrodorsal is large, hemispherical, 6 mm. 

 in diameter at the base. 



The cirri are XX, 17-20, 20 mm. long, and stout. The proximal segments are 

 about as long as broad, the distal from one-third to one-half again as broad as long, 

 and perfectly smooth dorsally. 



There are about 60 arms which are about 130 mm. long. All the division series 

 are 4 (3 + 4). The division series are strongly rounded dorsally and well separated. 

 This appears to be a dwarf specimen of this species. 



Carpenter thus redescribed the 2 specimens at Leyden which served as the basis 

 for Miiller's original description of Alecto bennetti. 



The centrodorsal is large, convex, and hollowed in the center, with 2 or 3 irregular 

 rows of cirrus sockets on its sides and its angles produced into short processes, above 

 which the ends of the basal rays are sometimes visible. 



The cirri are XL-L, about 25, the segments rather stout. The fifth or sixth 

 segment is slightly longer than broad, the next 3 or 4 are slightly the longest, and 

 those following decrease very gradually in length, nearly all of them being longer 

 than broad. The terminal segments are shghtly compressed laterally, and the 

 penultimate has a very faint opposing spine. 



