388 



PROCEEDINGS OF THE \ \TIOS.\L UIKEUM. 



vol. 38. 



show ing intercalated columnars in all stages of growth, and at intervals 



a large nodal bearing five cirri. The 

 interval between these nodals rapidly 

 increases as a result of extensive in- 

 tercalation of new columnars; correla- 

 tivelv the nodals progressively lose t heir 

 individuality (fig. 2), the cirri, which 

 are never more than rudimentary, drop 

 off, and the nodals become indistin- 

 guishable from the other segments. 

 The ten internodes possess the follow- 

 ing numbers of columnars, the first 

 being that just beneath the basals: I 

 (intercalated), 1 (intercalated), 3 (2 

 intercalated), 4 (3 intercalated), 5, 8, 

 14, 25 (there are no cirri at this nodal 

 and the cirrus sockets are partially 

 obliterated), 38 (all of the same size; 

 the difference between this nodal and 

 the internodals above it is not great ; 

 the cirrus sockets are indistinct); 38 

 (all of the same size; the nodal is 

 scarcely distinguishable from the co- 

 lumnars on either side of it. and the 

 cirrus sockets can only just be made 

 out); this last nodal is 151 mm. from 

 the crown (fig. 2); below this point 

 the stein is cylindrical, 5 mm. in 

 diameter (having decreased in diam- 

 eter very gradually as the segments 

 lost their pentalobate outline), each 

 segment being 1.5 mm. high, and 

 all of equal size; the ends show a 

 depressed central area surrounded by 

 a rim about 1.5 mm. broad with 15 

 coarse radial crenelhe dig. :!): (list ally 

 the stem very slowly increases in diam- 

 eter, the broken end being 11 nun. 

 across; the lasl few columnars are 3.5 

 to 1 mm. in height. As the distalmost 

 part of the stem enlarges with slightly 

 greater rapidity than the remainder, 

 the stem was undoubtedly broken off 

 close to the root. The cirri are all 



broken; but they appear never to have exceeded ."> mm. in length. 



FIG. 1.— ] Rl berrimds; 



I ROWN \\l' 1 I'll RPA1 MN; 



FRI 



