548 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



Station 5482. — Five specimens ; one has ten arms 90 mm. long and 

 cirri 77-82, 55 mm. to 60 mm. long; another has ten arms 100 mm. 

 long and cirri 82-107, 75 mm. to 80 mm. long, and a third is similar; 

 one specimen has eleven arms 100 mm. long and cirri 85-94, 60 mm. to 

 70 mm. long; the single IIBr series is 2 as in A. macroyoda; the last 

 specimen also has eleven arms, one of the IBr axillaries bearing three 

 equal arms instead of the usual two. 



Family THALASSOMETRIDiE. 



Subfamily TH:A.3LiASSOM:ETRI]Sr..?E. 

 Genus COSMIOMETRA. 



COSMIOMETRA PHILIPPINENSIS, new species. 



Centrodorsal conical, about 4 mm. broad at the base and 4 mm. 

 long; cirrus sockets arranged in ten columns, two to each radial area, 

 two or three sockets to a column; the columns of each radial area 

 are separated in the mid-radial line by a broad, bare, more or less 

 finely spinous area about equal in width to a column of cirrus sockets; 

 outwardly the columns of cirrus sockets are in close apposition 

 with those of the adjacent radial areas. 



Cirri stout, XX, 45-54 (the longer 49-54), 35 mm. to 42 mm. 

 long; first segment short, the following gradually increasing in 

 length to the fourth, which is about twice as broad as long, and the 

 fifth, which is about half again as broad as long; sixth a transition 

 segment, half again to twice as long as broad; following segments 

 gradually decreasing in length, becoming squarish about the eleventh 

 and twice as broad as long after the fifteenth; after the eighth or 

 ninth the distal dorsal edge of the segments becomes slowly promi- 

 nent so that the segments after the fifteenth or sixteenth are pro- 

 vided with a high and prominent dorsal spine as in the other species 

 of the genus. 



Ends of the basal rays visible as small but prominent tubercles 

 in the angles of the calyx; radials concealed, or just visible in the 

 mid-radial line; IBr^ more or less crescentic, convex proximally, 

 about four times as broad as long, with finely serrate edges and with 

 the lateral thirds of the dorsal surface finely spinous; IBrg broadly 

 pentagonal or rhombic, with blunted lateral angles, twice as broad 

 as long, the edges finely serrate, the dorsolateral edge with a few 

 small spines; division series and first brachial sharply flattened 

 laterally; IIBr 2. 



Nineteen arms 130 mm. long; first brachial slightly wedge-shaped, 

 about twice as broad as long exteriorly; second brachial similar, but 

 nearly twice as large; third and fourth brachials (syzygial pair) 

 oblong, half again as broad as long; following six brachials approxi- 

 mately oblong, about two and one-half times as broad as long, then 



