from the Dutch East Indies. 35 



consequently sliarper ; the long-er earlier segments have 

 slightly enlarged distal ends ; tiiis character persists to the 

 end of the cirrus, but is less marked on the spinous distal 

 segments. 



The division series and the arms resemble those of 

 I), -flagellata, but are much more slender and delicate ; the 

 division series and first brachials may be well separated or in 

 lateral contact ; they are usually not quite in apposition, 

 though possessing straight lateral edges which are slightly 

 swollen, suggesting the lateral processes seen on the proxi- 

 mal ossicles of the species of Stephanometra, though their 

 outer maro-in is straiirht instead of convex. The character- 

 istic rugose arm-structure and the low though prominent 

 synarthrial tubercles of D.^a^e/^ato are reflected in a delicate 

 and modified form. 



Type Locality. ' Siboga ' Station No. 320; north of the 

 eastern end of Java ; 82 metres. 



Family Colobometridse. 

 Cyllometi'a gracilis, sp. n. 



This new species is related to C. manca, but differs 

 markedly in its longer and more slender cirri, which are com- 

 posed of longer segments. 



The centrodorsal is discoidal, the dorsal pole flat or slightly 

 concave, 2 mm. in diameter ; the cirrus sockets are arranged 

 in one and a partial second marginal row. 



The cirri are (in the type) XXIII, 25-30 (usually nearer 

 the latter), 21 mm. long : the first segment is short, the 

 second is about twice as long, from one-third to one-half 

 again as broad as long, the third is slightly longer than 

 broad, the fourth and fifth progressively increase in length, 

 and the sixth to the ninth or tenth are the longest, about 

 twice as long as their proximal diameter ; the following 

 segments gradually decrease in length, so that the last 

 twelve before the penultimate are subequal, slightly longer 

 than broad ; as a whole the cirri are long and unusually 

 slender ; owing to the crowded condition of the cirri on the 

 centrodorsal the first segment is sharply flattened laterally 

 against the first segments of the cirri on either side ; the 

 disfal dorsal edge of the fourth and following segments is 

 slightly swollen, this after the seventh becoming a trio of 

 dorsal spines, a central, larger, and two smaller, lateral ; 

 the central spine projects more dorsally than do tlie other 

 two, but does not extend so far distally ; all are very small ; 

 on the last twelve or fifteen segments before the penultimate 



3* 



