206 ECHINODERMA OF THE INDIAN MuSEUM, PART VII. 



distally. The proximal oblong brachials have the proximal and distal ends some- 

 what prominent ; after about the twentieth brachial the distal edges begin to 

 overlap, and in the distal portion of the arm the brachials have the distal part 

 somewhat expanded, giving approximately the same "dice-box" appearance 

 which is characteristic of the terminal portion of the arms among the Antedonidse. 



The pinnules are essentially as in the related species of the genus ; the first 

 three pinnules on each side (PPi-3, a-c) are very strongly carinate. 



The colour in spirits is white, the perisome, and sometimes the IBr series and 

 arm bases, light brownish. 



Locality.— /SoM/A 0/ K^irrachi (22° 24' 00" N. lat., 66° 51' 30" E. long.); 765 

 fathoms ; bottom temperature 43° Fahr. ; green mud. — Six specimens. 



THALASSOMETRA ASTER. 



Antedon aster 1907. A. H. Claek, Proc. U. S. Nat. Mus., vol. 33, p. 145. 

 Thalassometra aster 1907. A. H. Clark, Smiths. Miscell. Coll. (Quarterly Issue), 



vol. 50, part 3, p. 360. 



Habitat. — Southern Japan. 



Depth.— 369-405 fathoms. 



THALASSOMETRA HIRSUTA. 



Thalassometra hirsuta 1911. A.H. Clark, Proc. U. S. Nat. Mus., vol. 39, p. 552. 

 Habitat. — Philippine Islands. 

 Depth.— 117-383 fathoms. 



THALASSOMETRA MARGINATA, sp. nov. 



Description. — Centrodorsal truncated conical, the sides slightly convex, 

 3-5 mm. broad at the base, 1'5 mm. broad at the dorsal pole and 2-5 mm. long 

 interradially ; the dorsal pole is covered with long coarse tubercles ; the cirrus 

 sockets are arranged in ten columns of two each which are in close lateral contact 

 exteriorly, but which are separated in the midradial line by an irregularly wedge- 

 shaped smooth area which at its base (proximally) is not quite so wide as a single 

 cirrus socket, and comes to a point between the distal sockets, which are nearly 

 or quite in apposition. 



Cirri moderately stout. XX, 34-46, about 40 mm. long ; the sixth or seventh 

 is a transition segment ; the longest proximal segment is from two to two-and- 

 one-half times as long as broad. 



The ends of the basal rays are visible in the angles of the calyx ; the sub- 

 radial clefts are shallow and broad. 



IBr, short, about four and one-half times as broad as long, with the 

 proximal and distal edges prominently everted and armed with about six or 

 eiwht irregular coarse dentations which have numerous fine spines at thek tips ; 



