's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 61 



near the base of the dorsal cirrus. The head is longer than broad, tra- 

 pezoidal and the two pairs of eyes are situated on its posterior half; 

 they are enlarged in the specimens showing sexual maturity. The an- 

 tennae are rather long, reaching the distal extremity of the basal joint of the 

 palps, that on its dorsal side is provided with an oblique 

 groove. The tentacular cirri are short, the longest one of the superior 

 pair only extending to the anterior margin of the 5 th segment, whereas 

 in Ner. mictodonta according to Marenzeller and Izuka it reaches to the 

 7th or 8 th segment. 



In the specimen from South-Flores the armature of the everted pro- 

 boscis consists of: 



I = a round group of 5 small paragnaths. 



II = a transverse, subtristichous group of 13 paragnaths, the smaller 

 ones in front. 



IV = a longitudinal group of 4 rows of paragnaths. 



III = a transverse group of paragnaths and one or two situated late- 

 rally at some distance. 



V = 3 conical paragnaths. 



VI = a row of 7 to 8 transverse and conical paragnaths, 



VII — VIII = a subdistichous belt of paragnaths, passing laterally into 

 a single row. 



In other specimens of Ner. rumphii group VI of the oral region of 

 the dissected proboscis only contains 6 transverse paragnaths and in group 

 I of the maxillary region there are 2 large, conical ones. The maxillae 

 have a blackish distal part and are provided with 6 teeth. 



The parapodia of the anterior two segments, consisting of a single 

 lobe, differ somewhat in appearance from those of Ner. mictodonta, as 

 described and figured by Marenzeller; the dorsal ligule extends only a 

 little beyond the setiferous lobe, that is as long as the ventral ligule. 

 The dorsal cirrus is somewhat longer than the dorsal ligule, whereas the 

 ventral cirrus does not reach to the distal extremity of the ventral ligule. 

 The setiferous lobe has its posterior lip rounded triangular, shorter than 

 the anterior one, that has the shape of a rounded lobe ; its middle-lip 

 is hardly visible. The epitocous transformation of the parapodia com- 

 mences in the cT with the 24th parapodium, in the 9 with the 29 lh one, 

 whereas according to Izuka in the Japanese worms it occurs already 

 with the 21 st one. Unfortunately Izuka's description is somewhat incom- 

 plete, for he -does not mention whether his description relates to the male 

 or female form ; neither does he say anything about the cirri of the an- 

 terior parapodia. However in the specimens from Dobo and Flores the 

 dorsal cirri of the anterior six parapodia and the ventral cirri of the 



