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or pinnules; (4) the structure and distribution of the disk ambu- 
lacra; (5) the form and proportions of the brachials and the 
distribution of the syzygies; (6) the form, size, and general appear- 
ance of the pinnules, (7) the variable size of the anal tube; and 
(8) the variability of the base; the arm structure and its variations 
Point to the same conclusion; the species of the Comasteridæ with 
the centro-dorsal reduced to a mere centrale” often have strong 
interbrachial plates, closely corresponding in number and arrange- 
ment to those of Vintacrinus, and now we find that ten-armed 
species of Comasteridæ occasionally have extremely long and 
attenuated arms, a variation distinctly in the direction of the per- 
manent condition of Uintacrinus. Could we combine the centro- 
dorsal, I Br, and interradials of Comanthus belli or C. nobilis with 
the ten greatly elongated and slender arms sometimes found in 
Comatula pectinata or Comactinia eéchinoptera, we would have an 
Organism which could scarcely be separated generically from Uin- 
tacrinus. 
The very strong carination of the basal joints of the first 
two pinnules remarked by Carpenter in this specimen is no 
greater than in examples at hand from the Philippine Islands; 
indeed Carpenter himself says that some individuals in Professor 
Semper's collection from Bohol (Philippines) are similar to it. 
The specimen has twelve cirri, of which only three are of 
full size, these being 8 mm. to 9 mm. long with thirteen or four- 
teen joints. | 
Singapore. June 17, 1904. Seven specimens, all with 
ten arms, from 35 mm. to 65 mm. in length; a specimen with 
arms 65 mm. long differs from the others in having the lower 
part of the arms considerably swollen, as is commonly the case 
in C. sølaris; it has elongate genital glands, and thirteen cirri 
With twelve or thirteen joints, 10 mm. long. 
June 15, 1905. Five specimens; three are of medium 
Size, with eleven arms, two are very small (young) with ten arms. 
