30 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Taimyr with arms about 18 mm. long had in two cases 18 septa on the end of the 

 third brachial; on the ninth brachial there were 18 and on the fourteenth 15 septa. 

 Another young individual of the same species from East Greenland with arms 65 mm. 

 and cirri 18 mm. long had on the distal end of the third brachial 20 septa. A young 

 individual of Catoptometra magnified minor with arms 35 mm. long had 11 septa on 

 the distal end of the IBr : , two of them complete and forming an indistinct dorso- 

 ventral ridge. On the distal face of the third brachial there were 16 septa, 6 com- 

 plete septa and 2 ventral beams. The degree of strength was 1. No areola was 

 present. On the distal face of the ninth brachial there were 14 septa, and on the 

 distal face of the fourteenth brachial 12. A full-grown Catoptometra rubroflava with 

 arms about 100 mm. long had 28 septa on the IBrj, 25 on the third brachial, and 24 

 on the ninth brachial. A young Antedon petasus with the arms about 16 mm. long 

 had two (complete) very weak septa, visible only with the strongest magnification. 



COMASTERIDAB 



Comatella brachycirra. In a specimen with the arms about 50 mm. long the 

 distal face of the third brachial has 15 septa, 5 complete broad septa and 2 ventral 

 beams; the degree of strength of the septa is 3. In another case there were 17 septa 

 on the distal face of the third bracliial, and 13 on the distal face of the sixteenth 

 brachial. 



Comissia peregrina magnifica. In a specimen with arms about 150 mm. long the 

 distal face of the third brachial has 30 septa, 11 complete septa, one of them forked, 

 16 incomplete septa, and 2 ventral beams. The degree of strength is 4. The areola 

 is of medium breadth, stout and well marked. The distal end of the thirteenth 

 brachial has 27 septa, 13 incomplete septa and 3 ventral rows of tubercles. The 

 septa run out into the dorsal margin of the ossicle. 



Capillaster sentosa. In a specimen with the arms 90 mm. long the IIBr 2 has 

 45 septa, 6 complete septa and 2 ventral beams. The IIIBr 2 has 44 septa, 8 com- 

 plete septa, 2 ventral beams, some septa forked, a distinct areola, strength 4. In 

 three other cases the septa are 44, 43, and 42. The IVBr 2 has 37, 38, 39, and 43 septa. 

 The VBr 2 has 33 and 38 septa. The second brachial, following a VBr axillary, has 

 28 and 25 septa, 2 complete. In a fifth case the number of septa on a IVBr 2 is 44, 

 2 of them ventral beams. On the following second brachial the septa were 40, two 

 of them complete; there was a narrow but distinct areola; the degree of strength 

 was 3. In another case the second and third brachials would not separate in spite 

 of violent boiling in KOH. On the twenty-ninth brachial (second hypozygal) there 

 were 34 septa, 3 complete septa, 6-7 very small tubercle-shaped marginal septa, and 

 2 ventral beams; the degree of strength was 4. In another case the second hypozygal 

 (about the thirty-first brachial) had 29 septa. 



Comatula pectinata. In a specimen with the arms about 70 mm. long the proximal 

 face of the axillary had 58 septa with the degree of strength 3-4 ; of the septa 45 are 

 dorsally or laterally directed; the 13 septa directed ventrally are incomplete; of the 

 45 dorsal septa 19 are complete and some are forked; the areola is indistinct; the 

 surface of the ossicle is not, as usual, even or evenly curved, but is divided into three 

 or four faces that stand somewhat obliquely to one another and on difl'erent levels 

 in the horizontal plane when the ossicle is viewed from the proximal end; Gisle"n says 



