gg BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



pressed lateraUy like those foUowing, and directed stiffly upward. P^ is from 9 to 

 14 mm long with 13-19 segments of which the fourth is the longest, and resembles P,. 

 P, is from 7 to 12.5 mm. long with 13-17 segments. P^ is from 6 to 10.5 mm. long 

 with 13-22 segments which are shorter than those of the pinnules precedmg, never 

 more than one-quarter again as long as broad. P5, Pe, and P; are simUar, but with 

 the segments still shorter and mcreasing in number. P^ is 7 nun. long with 24 seg- 

 ments. The distal pinnules are from 7 to 10 mm. long with 21-25 segments of which 

 the first two are a little swollen, and the others are very thin and slender. Pa corre- 

 sponds approximately with P), Pt corresponds to P2, etc. 



The mouth is somewhat displaced laterally. The anus is subcentral. The 

 peristome has calcareous granules. 



The color is dark red (in alcohol deep red-brown), with the oral pinnules often 



tipped with white. 



In one of the specimens from Mjoberg's station 13 (Broome) the cirri are XXX 

 (with one small), 19-28 (those in the distal row about the dorsal pole with 19-24, 

 and those in the proximal row about the rim of the centrodorsal with 25-28 segments). 

 In a cirrus from the distal row with 19 segments the proximal dorsal transverse ridge 

 begins on the fourth and the distal on the eighth segment. In another from the 

 same row with 24 segments the proximal ridge begins on the eighth and the distal on 

 the eleventh segment. In a cirrus from the proximal row with 28 segments the proxi- 

 mal ridge begins on the third and the distal on the eighth segment; the six outermost 

 segments are smooth dorsally. 



In another specimen from the same station the cirri are XXVIII (with one small), 

 20-25 (the proximal with 23-25 and the apical with 20 or 2 1 segments). In a cirrus from 

 the apical row with 20 segments the proximal ridge begins on the fifth and the distal 

 on the ninth. In another cirrus from the same row with 21 segments the proximal 

 ridge begins on the fourth and the distal on the eighth. In a third cirrus from the 

 same row \vith 21 segments the proximal ridge begins on the fifth and the distal on 

 the fifteenth segment, the latter being only sHghtly developed. P, is 15 mm. long 

 with 20 segments. P2 is 14 mm. long with 19 segments. P3 is 12.5 mm. long with 

 17 segments. P« is 10.5 mm. long with 18 segments. Ps is 12.5 mm. long with 21 

 segments. Pa is 15 mm. long with 19-21 segments. Pb is 12.5 mm. long with 16 

 segments. Pc is 11 mm. long with 16 segments. 



Dr. H. L. Clark said that this species is one of the commonest of the small comat- 

 uhds in the Broome region, and he met with it constantly. It was particularly com- 

 mon and easy to collect (along with Zygometra comata) at the extremely low September 

 tides in 1929 on the hard sand bottom of Roebuck Bay. His field notes read: "Very 

 lovely; deep red purple, with or without white." "Sometimes apparently deep 

 yellow, with or without white on basal pinnules." He said that alcohohc specimens 

 keep their color very weU. Dry specimens are duller and show no white, but instead 

 are various shades of yellow and pale brown. Practically aU gradations may be 

 foimd between the purple and yellow individuals. 



His largest specimens have arms about 90 mm. long, and the cirri are XXX- 

 XXXII, 28-30 while the smallest individuals have arms about 35 mm. long and the 

 cirri XVI-XIX, 16-21. 



Dr. Clark said that the most interesting specimen was one with 1 1 arms, a single 



