PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 273 



type, though the latter have the same smooth elongated character in both. 



Although of larger size, more of the radials arc visible, while the axillaries have 

 sharper proximal angles and the IBr, are therefore more incised. 



There are slight indications of lateral flattening upon the 4 lower brachials. 



The segments of Pi are relatively longer than in the tj^ie. 



Notes. — Thanks to the courtesy of Prof. F. Jeffrey Bell, I was able to examine both 

 these specimens in the British Museum. After a study of the larger example I decided 

 that this form is closely related to Th. tenelloides, but it is a smaller species with lono-er 

 brachials which are not so nearly oblong. There is the same short segmented Pi; Pj 

 and P3 are large and stiffened; P, is slightly larger and longer than P3; Pj is smaller 

 than P2 and P3. 



In the smaller individual there are 15 cirrus segments of which the pro.ximal are 

 very long. Pi is short with comparatively few long segments; P2 and P3 are large. 



This last is the spechneu figm-ed by Carpenter under the name notata; but his notes 

 on notata evidently refer to the individual figured as tenuicirra, except in regard to the 

 number of the cirri, the incision of the IBri, and the character of Pi. [Note by A.M.C] 

 The type specimen of notata is not now (1958) to be found in the British Museum. The 

 type of tenuicirra is in very poor condition, the centrodorsal broken and the radials 

 separated. The cirri are detached but a few remain in the jar. One with 16 segments 

 has the third segment already over twice as long as broad and the fourth and filth are 

 about six times as long as broad. No complete Pi remains but the basal six or seven 

 segments are about as long as broad. P2 has 14 segments and is 5 mm. long. Only the 

 first two segments are not longer than broad. 



Some further specimens of this species were obtained by the Danish Expedition to 

 the Kei Islands in 1922, about which nothing has been published. Smce they show 

 some differences from the tj-pes, a full description is given here. 



The centrodorsal is rather sharply conical, ncarlj' twice as broad basally as it is 

 high, with the sides almost completely covered with closely crowded cirrus sockets 

 which decrease slowly in size towards the apex. 



The cirri are XL, 22-24, 25-30 mm. in length. They are very slender, nearly 

 straight, tapering gradually from the base to an attenuate and very pointed tip. The 

 first segment is very short, three times as broad as long, the second is half again as 

 broad as long, the third is usually slightly longer than broad but may be slightly broader 

 than long, the fourth is from two to three times as long as broad, and those following are 

 much elongated, in the central portion of the cirri being five or six times as long as the 

 median width with slightlj- swollen ends and dislallj' about four times as long as broad 

 with the dorsal and ventral profiles nearly straight. The antepenultimate and penul- 

 timate segments are perfectly straight and taper gradually, the latter being exceedingly 

 slender and ending almost in a point, which bears the extremely small conical terminal 

 claw. 



The distal portion of the radials is visible as a very narrow band beyond the rim 

 of the centrodorsal. The IBri are nearly or quite four times as broad as long in the 

 median line, somewhat uiciscd in the median line by a pro.ximal process from the 

 axillary. The lateral borders are in contact basally. The IBro (axillaries) are about half 

 again as broad as long. The distal sides are slightly curved and are at right angles to 

 each other. The distal apex is slightly produced. There is a slight, well-rounded 

 proximal median projection. 



