6i2 Memoirs of the Indian Museum. [Vol. V, 



480 segments. The greatest width of the body, not including the feet, is 4-5 

 mm. 



The whole body is suffused with iridescent purplish green, especially marked in 

 the anterior region . The basal parts of the various appendages of the head are 

 deeply coloured. In several specimens the anterior part of the body (10-14 se S~ 

 ments) is paler in colour than it is further behind, especially the branchiae. This 

 may be due to regeneration of the anterior end. The body is round in front, some- 

 what flattened behind. 



The head (figs. 14A, 14B), as usual in this genus, is partly concealed dorsally by 

 the projecting peristomium, ventrally by the palps. The median antenna is 11 mm. 

 long, very slightly exceeding the inner paired antennae, and nearly twice as long as 

 the outer pair. The median antenna if bent back reaches to the middle of the 10th 

 setigerous segment. The swollen bases of the antennae are composed of 12-13 

 rings. The cephalic lobe is small, and the posterior part is hidden by the peristo- 

 mium. It bears two dark pigment spots which may represent eyes. The outer 

 antennae are attached beneath the median pair. The frontal palps are fusiform, 

 shorter than the ringed bases of the antennae. The palps are large, and are grooved 

 on the dorsal surface. The lower surface shows two portions differing in appearance, 

 the inner (anterior) half being the more tumid, and marked off by a deep groove from 

 the outer half. The peristomium is very little longer than the succeeding segments, 

 and slightly narrowed. The tentacular cirri are about as long as the ringed bases of 

 the antennae. At first sight they appear to be attached to the anterior margin of 

 the peristomium, but a closer examination shows that they really spring from the 

 dorsal surface, a short distance behind the front margin. Ventrally the peristomium 

 forms a wide loose lower lip. 



In six out of the seven large individuals the first branchia is on the 4th foot. 

 In the other one, which is the smallest of the seven, the first branchia is on the 5th 

 foot. The branchiae (figs. 14A, 14F) increase in size as far as the 4th-6th pair. 

 The largest have about seven whorls of moderately long filaments, attached to a 

 stout stem, the base of which is more or less distinctly ringed. The anterior yy pairs 

 of branchiae are branched and are approximately as long as the dorsal cirri, the two 

 organs gradually decreasing together. The 78th pair consists of simple filaments. 

 There are 20-40 segments with these simple filiform branchiae, the last few being 

 like minute papillae. 



The mandibles (fig. 14D) are fused at the anterior end. The front margin 

 has a rounded notch at each side and a more acute notch on each lateral margin. 

 The posterior limbs are black and slightly expanded distally. The maxillae are very 

 broad (fig. 14c), the supports being rather short and rounded, the forcipate processes 

 stout and boldly curved. The great dental plates have 6-8 teeth on the right 

 side, 7-9 on the left. The azygos plate has 6-9 teeth. The crescentic plates have 

 7-10 teeth. On the outer side of the latter are two rectangular plates, without 

 teeth. 



The feet are all provided with long slender dorsal cirri, each of which has a bundle 



