30 Bl III. I IN 82, I NITBD STATES NATIONAL MUSEUM 



Taimyr with arms about IS 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 Bame Bpecies from East Greenland with arms 65 mm. 

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

 individual of Catoptometra magnified minor with anus 35 nun. long had 11 septa on 

 the distal and of the 1 lir, , two of them complete and forming an indistinct dorso- 

 v. Mitral 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 ,,f the fourteenth brachial 12. A full-grown Catoptometra rubrojlava with 

 arms about 100 mm. long had 28 septa on the IBr,, 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. 



COMASTERIDAE 



Comatdla brachycirra.—hi 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 

 nn the distal face of the third brachial, and 13 on the distal face of the sixteenth 

 brachial. 



Comisxin peregrina magnified. — -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. 



CapiUaster seniosa. — In a specimen with the arms 90 mm. long the IIBr 2 has 

 l", septa, 1; 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. has 3:', 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 IYBr 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 :?. In another case the second and third brachials would not separate in spite 

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

 were :;t 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. 



( 'omaivla pi ctinata. — In a specimen with the arms about 70 mm. long the proximal 

 [ace <>f the axillary had ,">s septa with the degree of strength 3^; of the septa 45 are 

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

 45 dorsal septa L9 are complete and some are forked; the areola is indistinct; the 

 surface nf the ossicle is nut. as usual, even or evenly curved, but is divided into three 

 <>r four faces that stand somewhat obliquely to one another and on different levels 

 in the horizontal plane when the ossicle is viewed from the proximal end; (lisl^n says 



