I 1 1 



at the base and 2.5 mm. high; the cirrus sockets are arranged in ten equally spaced columns, 

 each column separated from its neighbours <>n either side by a shallow groove from one fourth 

 me third of a cirrus socket in width; there are tw>, more rarely three, cirrus sockets to a 

 column; th< il pole of the centrodorsal bears .1 rosette of five prominent tul)ercles. 



The cirri an XX XXV, 99 -113 (usually nearer the latter), 77 mm. long, stout basally 

 and tapering slightly distally, though tliis distal taper is mme gradual and therefore nol so 

 marked .is in Pterometra trichopoda\ the longest cirrus segments are from one third to one 

 half again as long as broad; in the earlier segments the ventral distal edge is rather prominent; 

 after the eighth the median portion begins to project, overlapping the base of the ne\t suc- 

 ceeding segment, this after the eleventh or twelfth becoming a sharp ventral spine which 

 persists . - far as the twentieth, or even the twenty-third segment; at first this ventral spine 

 mak' 'iisiderable angle with the longitudinal axis of the segments, but distally its outer 



part becomes more nearly parallel to it; the cirri are more broadly rounded ventrally than 

 those of Pt. trichopoda, and there is no well developed sharp ridge or keel extending backward 

 from the ventral spine along the. midventral line of the segments; the dorsal processes arise 

 ver) slowly, and are never very prominent: they lirst appear on about the twenty-third segment; 

 the cirri are moderately compressed laterally, less so than in Pt. trichopoda. 



The radials and division series resemble those of Pterometra spfendtda, but are slightly 

 more robust. 



lhe arms are from 22 to 28 in number, and resemble those ot Pt. splendida. 



In the type (which has 28 arms) Pj is 10 mm. long with 18 segments of which the 

 terminal four or five are abruptly smaller than the preceding; it is considerably stouter and 

 more sharply triangular than P, in Pt. trichopoda\ 1', is 11.5 mm. long with 16 segments, 

 strongly though not sharply triangular in section, tapering evenly to a slender tip; the outer 

 segments are about tuier as long as broad, without projecting distal edges; P :i is 15 mm. or 



16 mm. long with 16 segments of which those in the distal half are much elongated and 

 slender, with prominent spines at the prismatic angles; P, is 17 mm. long with 15 segments, 

 similar t<> 1' but with a slightly more even taper and hence appearing stouter distally; 1' is 



17 mm. long with 1 ( segments, resembling P 4 ; P ( . is 16.5 mm. long with 14 segments, resembling 

 1' P is [8.5 mm. long with 16 segments, resembling P ; P e is slightly stouter in the basal 

 portion than the preceding pinnules; on the succeeding pinnules the relative length oi the stout 

 basal portion increases so that the genital pinnules are broader and more sharply triangular 

 than the preceding with shorter segments ot which only the outermost have spines at their 

 prismatic angles; the distal pinnules are about 17 mm. long, becoming gradually shorter toward 

 the arm tips. 



A specimen with 22 arms about 95 mm. long is rather larger than the others, in all 

 ot which the arms are broken off at the base. P, is 9.5 mm. long with 14 segments; 1' is 

 il mm. long with 14 segments; 1' is 15.5 mm. Ion- with 17 segments; P, is 17 mm. long 

 with [5 segments; I', is 18.5 mm. long with 17 segments; 1\ is 1S.5 mm. long with [6 seg- 

 ments; I'. is 19 mm. long with 19 segments; 1', is [9.5 mm. long with iS segments; 1' 

 10 mm. long with 1 ments. 



