A MONOGRAPH OF THE EXISTING CKINOIDS 369 



ments are triangular in cross section. Except as noted, P 2 resembles P,. P 3 is 7-9 

 mm. long, with 13-17 segments. P 10 is 5.5 mm. long, with 16 segments. P 22 is 7.5 

 mm. long, with 18 segments. P 76 is 9 mm. long, with 23 segments. The first two 

 segments of the distal pinnules are broadened and swollen. From the ninth onward 

 the segments are long and slender. P a is 7 mm. long, with 15 segments, corresponding 

 to Pi. P„ is 9 mm. long, with 17 segments. 



The color in life was dark red, or bluish violet with the dorsal side of the arms and 

 pinnules and in the outer half the ventral side also pale yellow, the yellow representing 

 regenerated portions. 



Although it is not so stated, this description seems to have been based mainly on 

 the specimen from station 9, a few notes being added from the specimens from the 

 other stations. 



In the specimen from Mjoberg's station 11 the cirri are XXIV, 27-38. The cirri 

 in the peripheral row have the following numbers of segments: 38; 37, with spines 

 from the sixteenth; 36, with spines from the fifteenth — an old cirrus; 32, with a spine 

 only on the thirty-first — a young cirrus; 32 (a young cirrus) and 32. A very young 

 intermediate cirrus has 28 segments. The cirri in the lower or apical row have the 

 following numbers of segments: 34, with spines from the twelfth; 31, with spines from 

 the eleventh; 31, with spines from the eleventh; 28, with spines from the eleventh; and 

 27, with spines from the tenth. 



In the specimen presumably from the vicinity of Perth, Western Australia, the 

 cirri have 42-47 segments and reach a length of 40 mm. The longest cirrus segments 

 are slightly less than twice as broad as long. The twentieth or twenty-first and follow- 

 ing segments bear dorsal spines. The synarthrial tubercles are prominent and conical 

 with the apex sharp, though they are not especially produced. 



The six specimens dredged by the Endeavour between Fremantle and Geraldton 

 are all large and well developed, with the arms 185 to 195 mm. long. The centro- 

 dorsal is 6 to 8 mm. in diameter and is very broad, with a flat or more or less convex 

 dorsal pole, in the center of which there is sometimes to be seen a small pit. The 

 cirri are XX-XXXII, the longest with 37-44 segments, and are 35 to 40 mm. in length. 

 They are moderately stout and are composed of approximately subequal segments of 

 which the longest (in the proximal portion) are half again to twice as broad as long, 

 the distal being slightly shorter. 



Muller described Comatvla tessellata in the following terms: There are 10 arms. 

 The cirri are XX-XV, 45; the cirrus segments are scarcely so long as broad, and the 

 last 24 have small dorsal spines. The radials are very short. The intersyzygial 

 interval is 8-11, rarely as many as 15, muscular articulations. The brachials are very 

 short and are discoidal and imbricating, without a keel. P 2 , P 3 , and perhaps P 4 are 

 the largest pinnules. The skin of the disk bears small scattered calcareous plates. 

 The color throughout is violet. The size is 1 to 1 % feet (which would mean an arm 

 length of 150-225 mm.). Habitat India. The type specimen was in the Bamberg 

 Museum to which it had been given by Schonlein. 



Muller described Comatula (Aledo) milberti as follows: There are 10 arms. The 

 centrodorsal is convex. The cirri are XXV-XXX, 35, the segments in the distal half 

 with a dorsal spine in the middle, which is placed transversely. The radials are ex- 

 tremely short. The brachials are short. The intersyzygial interval is 9-10 muscular 



