PART 5 A MONOGRAPH OF THE EXISTING CRIXOIDS 499 



422 fathoms, so that the single individual from Blake station 222 mentioned and 

 fij^ured in 18S1 is evidently the only one he ever saw. 



In 1908 I described a supposedly new species which I called Zenomeira pyramidalis; 

 but this is obviously nothing more than a case of indi\ndual variation. 



Hartlaub did not find Carpenter's specimen in the Blake collection, which was 

 turned over to him after Carpenter's death. He \\Tote me to see if he could have 

 another for study, and I sent him one from Albatross station 2663, which is the one 

 described and figured by him in 1912 as a supplement to the description published and 

 the figures left by Carpenter. 



Genus ANISOMETRA John 



Aniaometra John, Rep. B.A.N.Z. Antarctic Res. Exped. 1929-31, ser. B, vol. 4, pt. 6, 1939, p. 204 

 (diagnosis; type species Aniaometra frigida sp. nov.). 



Diagnosis. — A genus of Zenometrinae in wliich the cirrus sockets are arranged 

 in ten columns, two m each radius, the radial pairs being separated from one another 

 on the peripheral part of the centrodorsal by a narrow naked space, which is not 

 ridged or grooved; cirri not fully known; Pi present; oral pinnules short, of few and 

 unequal segments ; genital pinnules twice as long and of elongated segments. 



Type species. — Anisometra Jrigida John, 1939. 



Geographical range. — Known only from off MacRobertson Land, Antarctica 

 (lat. 66° S., long. 62° E.). 



Bathymetrical range. — 219 meters. 



AN1SOMETBA FRIGIDA John* 



Anisometra frigida John, Rep B.A.N.Z. Antarctic Res. Esped., 1929-31, ser. B, vol. 4, pt. 6, 1939, 

 p. 192 Oisted), pp. 204, 205, fig. 4. 



Description. — The type and only known specimen is small, the distance from the 

 proximal edge of the IBri to the second syzygy (9 + 10) is 6.0 mm. 



The centrodorsal is high and conical, slightly higher than wide, the basal width 

 being 1.2 mm. and the height 1.3 mm. The dorsal pole is rounded, the ventral edge 

 straight. The cirrus sockets are arranged in ten regular colimins, the pair of columns 

 in each radius being separated on the proximal part of the centrodorsal by a narrow 

 naked area which is quite flat. There are three to five sockets in each column. 



No cirri remain attached to ttie centrodorsal, but a small one, about 6 mm. long, 

 was found wedged between a pair of arms and presumably belongs to this species. It 

 is probably immature. There are 21 segments. The first two are short. The third 

 is slightly longer than broad. The fourth and fifth are t%vice as long as broad and 

 slightly waisted. The remaining segments decrease gradually in length, the distal 

 ones are broader than long. Each is wider distally than proximaUy, the greater ^vidth 

 being on the dorsal side, but there are no dorsal spines. Tlie opposing spine is weak, 

 the terminal claw strong. 



The radials are long and considerably wider distally than proximally. The 

 distal half of the dorsal surface is bent outwards at a marked angle to the pro.ximal 



*See also Addenda (p. 837) under 1963. 

 656-622—67 33 



