NO. 1798. CRTNOIDS COLLECTED BY THE ALBATROSS— CLARK. 547 



Pj 8 mm. long, small, slender, and evenly tapering, stiff, with 

 sixteen segments; Pj 13 mm. long, stouter than P^ with seventeen 

 segments, the outer with produced and spinous distal ends; Pg 15 mm. 

 long, with sixteen segments, slightly stouter than P,; P4 16 mm. long, 

 resembling P3; P5 14 mm. long; P7 13 mm, long; following pinnules 

 similar, becoming gradually more slender distally and increasing in 

 length to 14 mm.; the terminal four or live pinnulars have no ambu- 

 lacral structures and are abruptly smaller and more slender than 

 those preceding, with very spinous distal ends. 



The color is brownish yellow. 



Type.— Cat. No. 27495, U.S.N.M., from station 5413. 



Another specimen was secured at this station which has twenty 

 arms 90 mm. to 95 mm. long and cirri 100 mm. to 110 mm. long, with 

 99-105 segments; the longer cirri, however, are broken at the tip. 



Station 5414- — Nine specimens; one has twenty-one arms 95 mm. 

 long, cirri XXV, 99-112, 90 mm. to 105 mm. long; the IIIBr series is 

 developed externally; another has twenty arms 100 mm. long, the 

 cirri 95 mm. to 105 mm. in length; another has twenty arms 95 mm. 

 long and cirri 90 mm. to 95 mm. long; of the remaining specimens 

 one (small) has thirteen arms, one (small) sixteen, one eighteen, two 

 nineteen, and one twenty. 



This species is most nearly related to Asterometra 'pulcherrima,'^ 

 but it differs markedly in the much greater development of the cirri. 



ASTEROMETRA CRISTATA, new species. 



In general similar to Asterometra longicirra from the Ki Islands, and 

 to A. mirifica from the Sahul Bank. 



The IBr series and first two brachials bear a narrow, sharp, very 

 prominent median keel of uniform height, which is not nearly so high 

 nor so sharp as that of A. mirifica. In this latter the keels are seen 

 in profile to be rather strongly convex along the apex, giving a charac- 

 teristic scalloped appearance to the lower part of the animal; in the 

 present species the crest is straight, so that the profile view of the 

 animal is not altered. 



The cirri in the type are XX, 77-86, 60 mm. to 65 mm. long, rather 

 short, moderately stout, especially basally, ventrally rounded-carinate 

 in the proximal half, the distal ventral edge of the short proximal 

 segments being rather strongly produced, this character gradually 

 dying away as the segments become longer. 



The ten arms are 100 mm. long, proportionately more slender than 

 in the other related ten-armed species. 



The centrcdorsal is conical, with the cirrus sockets in ten columns 

 close together, two, more rarely three, sockets to a column. 



Type.— Cat. No. 27496, U.vS.N.M., from station 5483. 



aPtilometra pulcherrima A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 1909, p 400. 



