A MONOGRAPH OF THE EXISTING CRINOIDS 247 



e 2 . Less than XX cirri. 



/'. Antepenultimate cirrus segment half again as long as broad, and the penultimate 

 segment about as long as broad (southern Japan to the Kei Islands; 595-984 



meters) gracilipes, p. 265. 



f 2 . Antepenultimate cirrus segment only slightly, if at all, longer than broad. 



g 1 . Cirri VIII-XIV (usually about X), 10-13 (usually 12-13); longest cirrus segment 

 from three and one-half to four times as long as the median width (Gulf of Suez) . 



hartmeyeri, p. 267. 

 g 1 . Cirri XII-XX (usually XII-XVI), 8-12 (usually 9-11); longest cirrus segment 



about three times as long as the median width. 

 h l . Arms 30-53 mm. long; cirri 4-5 mm. long; not more than XV cirri (Amirante 



Islands and Seychelles; 31 meters) ignota, p. 269. 



/i 3 . Arms not more than 30 mm. long; cirri not more than 4 mm. long; usually 

 more than XV cirri (Bonin Islands; 128-210 meters) minuta, p. 270. 



COMISSIA MAGNIFICA <;islf>n 



Comissia peregrina var. magnified GISLEN, Nova Acta reg. Soc. sci. Upsaliensis, ser. 4, vol. 5, 



No. 6, 1922, p. 4 (192 m.). 

 Comissia peregrina magnifica GISI/EN, Nova Acta reg. Soc. sci. Upsaliensis, ser 4, vol. 5, No. 6, 



1922, p. 6 (Bonin Is.); Zool. Bidrag fran Uppsala, vol. 9, 1924, p. 76 (syzygial faces); fig. 62, 



p. 75 (syzygial face of the third brachial). 

 Comissia peregrina var. magnifica GISLN, Nova Acta reg. Soc. sci. Upsaliensis, ser. 4, vol. 5, No. 



6, 1922, p. 21 (Bock's station 59; description and discussion), figs. 10, 11, p. 28; pi. 1, fig. 2. 



Diagnostic features. The large size, the arms being from 150 mm. to 170 mm. 

 long, and the numerous cirri, which are XXX-XL, seem to distinguish this species 

 from all the others in the genus. 



Description. In one of the 2 specimens described by Gisle"n the centrodorsal is 

 pentagonal with the angles somewhat produced, 5.5 mm. in diameter and 1.5 mm. 

 high; the bare dorsal pole is 2.5 mm. in diameter. The cirrus sockets are arranged in 

 2 rows. 



The cirri are XXXV-XL, all broken. 



The radials are visible as small triangles in the interradial angles of the calyx. 

 The IBr] are very short, sLx times as broad as long, laterally in contact. The IBr 2 

 (axillaries) are three times as broad as long, low pentagonal. There is a low synarthrial 

 tubercle on the articulation between the elements of the IBr series. 



The 10 arms are from 150 to 170 mm. in length. If the first 2 syzygial pairs are 

 counted as single units there are 16 brachials to 10 mm. of arm length. The width of 

 the arms is from 2.5 to 1.3 mm. The first brachials are interiorly united. The second 

 brachials are three times as long exteriorly as interiorly. The first syzygial pair 

 (composed of brachials 3+4) is very short and bandlike. There is a weak articular 

 tubercle between brachials 4 and 5 on the inner side of the arm. Between brachials 

 5 and 6 there is a similar articular tubercle on the outer side of the arm. Between the 

 sixth-seventh and eighth-ninth brachials there are rounded knobs on the inner side 

 of the arms, and between the seventh-eighth and ninth-tenth similar knobs on the 

 outer side of the arms. The succeeding brachials are rounded with more or less 

 oblique articulations. The profile of the arms is proximally somewhat serrate, but 

 distally smooth. 



Syzygies occur between brachials 3+4, 13 + 14, and 17 + 18, and distally at inter- 

 vals of 3 or 4 muscular articulations. 



