A MONOGRAPH OF THE EXISTING CRINOIDS 197 



4, are somewhat longer than those following, which are shortly discoidal and in general 

 very uniform. Syzygies occur between brachials 3+4, again from between brachials 

 23 + 24 to between brachials 31+32, and distally at intervals of 13-15 muscular 

 articulations. 



The pinnules on the division series and Pi in their great thickness, size and stiff- 

 ness contrast strikingly with the pinnules following. They have thick cylindrical 

 segments with especially thickened distal ends which with smooth edges overlap the 

 bases of the segments succeeding. P D and P P are of about equal size, about 20 mm. 

 in length and composed of about 20 segments. P P on the inner IIIBr series is some- 

 what smaller than on the outer. The pinnule on the IVBR series is somewhat shorter. 

 Pi on the outer arms is about 16 mm. long, but on the inner arms markedly shorter. 

 The following pinnules vary a little in their length, but are always much smaller and 

 weaker. Their length decreases to the pinnule of the eleventh brachial. The pinnules 

 succeeding become larger again, reaching up to about 10 mm. in length. P a is 10 mm. 

 long, about as long as P b . The segments of these pinnules have sometimes short 

 lateral processes on their distal ends. The disk is incised, and is 32 mm. in diameter. 

 Sacculi are crowded on the pinnules. The color is purple-violet or chocolate-brown. 



While the preceding description is based wholly upon Professor Brock's three 

 specimens from Amboina, Hartlaub included in his account as a representative of this 

 species a specimen from Cochinchina in the Hamburg Museum, which in reality 

 represents H. magnipinna. 



Hartlaub remarked that his new species is the largest of the known forms in the 

 Savignyi group and has the largest number of arms. It is easily distinguished from 

 all the others by its stout and massive lower pinnules. He said that it is especially 

 interesting in possessing a feature that heretofore has not been observed in any 

 endocyclic comatulid, although it occurs in several comasterids, that is, the presence 

 in equal numbers of IIIBr 2 and IIIBr 4(3+4) series. He pointed out that while in 

 the comasterids the inner IIIBr series are 4(3+4) and the outer are 2, the reverse is 

 the case in this species. He also noticed that both in this form and in the comasterids 

 this arrangement is not wholly constant. He mentioned that while one or two 

 IVBr series may occur on the inner IIIBr series, on the outer IIIBr series there is 

 usually none, although there may be one. He discussed the presence of IIBr 2 series, 

 of which one of the specimens from Amboina possessed three, and said that this 

 variation in the number of elements in the IIBr series seems not to be unusual, as it 

 occurs in Craspedometra acuticirra, Heterometra nematodon, and Adelometra angustiradia 

 (the last, although a macrophreate form, was placed in the Savignyi group by Car- 

 penter). But he noted that in these species it is not so developed as it is in Comanthus 

 parvicirra, which is characterized by the greatest irregularity in this respect. 



Speaking of the specimens from Little Kei, Dr. August Reichensperger said that 

 Dr. Merton obtained four individuals of this well-characterized and fairly stable 

 species with 36, 39, 45, and 47 arms 130 to 140 mm. in length. There is little correla- 

 tion between the arm number and the size of the individuals. Except for one, all 

 have a smaller arm number than was given by Hartlaub. Reichensperger remarked 

 that in his specimens he confirmed the alternation of IIIBr 2 and IIIBr 4(3+4) series 

 noted by Hartlaub. He said that in general the outer IIIBr series are 2 and the inner 

 4(3+4). This, however, is a slip; he meant to say just the opposite, as is shown by 



