A MONOGRAPH OF THE EXISTING CRINOIDS 59 



the rods are more slender, smooth, the longer bent at an angle near the middle instead 

 of being more or less regularly curved. It is difficult, however, to make out the details 

 from dried material. 



Notes. — The foregoing description was based upon a dry specimen from Pieter 

 Faure No. 13227 very kindly lent me by Dr. H. L. Clark. 



Dr. Clark regarded this species as the young of Glyptometra sclateri. In his ac- 

 count of that species he said that it was represented in the collection sent to him by 

 an armless adult specimen and a number of quite young individuals. He said that the 

 latter were rather puzzling owing to the small centrodorsal and the relatively long IBr 

 series, and the presence in every case of just 10 arms. On the other hand, he said, the 

 cirri are essentially like those of the adult (XV-XVI, 15-17) and the IBr series and 

 lower brachials are distinctly wall-sided and in close apposition. He noted that in the 

 young specimens the calyx is only 2 mm. in diameter and the cirri are 4-6 mm. long. 

 Pi is stiff and erect with 7 segments, and P. is similar. Pj is a little longer with 9 seg- 

 ments, and Pb is the same. P3 and Pc are a httle longer with 1 1 segments and are more 

 flagellate at the tip. The following pinnules are shorter. 



Prof. Torsten Gislen in 1938 recorded, like Dr. Clark under the name Pachylo- 

 metra sclateri though ^vith a question mark, three specimens from Pieter Faure No. 

 12884 (from which lot Dr. Clark had seen one specimen), and one from Dr. Th. Morten- 

 sen's station 25. 



Of the three from Pieter Faure No. 12884 he said that the centrodorsal is flattened 

 conical with the cirri in about 12 columns. The cirri are XVII, 15-19, 6-7 mm. long. 

 The longest cirrus segments are one-third again as long as broad. There is an oppos- 

 ing spine, but the cirri are otherwise smooth. All are 10-armed young. The synar- 

 thrial articulations have a small, narrow, low, and indistinct tubercle. The first 

 syzygy is between brachials 3+4 and the second usually between brachials 9 + 10. In 

 one specimen the first four brachials are sometimes imited in two synarthrial pairs. 

 The distal intersyzygial interval is 2 muscular articulations. 



In the specimen from Mortensen's station 25 the centrodorsal is subhemispherical, 

 1.7 mm. in diameter. The cirri are X, 21, 9 mm. long. The segments after the second 

 or third are a little longer than broad, slightly broadened distally, the dorsal profile 

 therefore serrate. The segments are provided with a distinct keel but there are no 

 dorsal spines. An opposing spine is present. The terminal claw is shorter than the 

 penultimate segment. 



The radials are broad bands, a httle everted and thickened distally and laterally. 

 The IBri are tmce as broad as long, thickened and everted laterally and inconspicu- 

 ously everted distally. There is a similar eversion also on the IBr axillary, which is 

 pentagonal and half again as broad as long. On one abnormal postradial series there 

 is an incomplete third element in the IBr series. 



The 10 arms are all broken, but were 25+ mm. long. The brachials are smooth, 

 without the eversion seen in the elements of the IBr series. The IBr series and the 

 brachials as far as the fifth are wall-sided. After the tenth the brachials begin to be 

 wedge-shaped, but they always remain smooth doi-sally. There is a small but distinct 

 synarthrial tubercle. 



Pi is about 2.5 mm. long with about 9 segments of which the longest are half again 



