from the Dutch East Indies. 33 



The cirri are XXVI, 24-29, 22 mm. long : the first seg- 

 ment is short, the second is about twice as broad as the 

 median length, the third is slightly longer than broad to half 

 again as long as broad, and the sixth to the eighth are about 

 three times as long as their median diameter; the followiti"- 

 gradually decrease in length, so that the last ten or elev(Mi 

 are about as long as the distal diameter or only very slightly 

 longer ; the cirri are exceedingly slender ; the longer proximal 

 segments have slightly prominent ends; slight subterminal 

 dorsal spines are found on the eleventh and following. 



Tlie arms are about fifteen in number and about 45 mm. 

 long ; together with the division series they resemble those 

 of the other species of the genus. The lateral ornamentation 

 on the ossicles of the IBr series is confined to the lateral 

 third of the dorsal surface ; distal ly it gradually narrows, 

 disappearing at the base of Pi ; it consists of very numerous 

 small blunt spines, more or less coalescent, which exhibit a 

 tendency to become arranged in horizontal rows. 



Type Locality. ' Siboga ' Station No. 294 ; off the south 

 coast of Timor ; 73 metres. 



Mariametra tuherculata, sp. n. 



This species is nearest to M, delicatissima ; but in that 

 form the lateral ornamentation of the division series is merely 

 a slight roughening. 



The centrodorsal is large, thick discoidal, the dorsal pole 

 slightly convex, 2 mm. in diameter ; the cirrus sockets are 

 arranged in two closely crowded and irregularly alternating 

 rows. 



The cirri are XXI, 25-27, 20 mm. long; they are long 

 and rather slender with a slight distal taper : the first seg- 

 ment is short, the second slightly longer, the tiiird nearly as 

 long as broad, the fourth slightly longer than broad ; after 

 the tenth the segments slowly decrease in length, so that the 

 last four or five before the penultimate are about as long as 

 broad to about one-third longer than broad ; the outer eleven 

 or twelve have a slight distal dorsal carination, whicli is low 

 and rises very gradually from the dorsal surface, but ends 

 rather abruptly distally. 



The radials are con.cealed in the median line, and are only 

 slightly visible in the interradial angles ; the \\j\\ are very 

 siiort, almost oblong, five or six times as broad as long; the 

 axillaries are very sliort, nearly or quite three times as broad 

 as long ; the IIBr and IlIBr series are 2, the latter developed 

 externally ; the sides of the division series are in close 



Ann. ik Mag. N. Hist. Ser. 8. VoL x. 3 



