250 ZOOLOGISCHE MEDEDEELTNGEN — DEEL 1 V. 



2° a median region, measuring about 8 mm. in length and containing 40 

 segments, which show the usual epigamous change ; 3° a posterior or anal 

 region, about 2 mm. long, that has an oval shape and consists of nearly 36 

 segments, in which the parapodia are represented by rudimentary, small, 

 papilliform appendages, without bristles. The head is provided with 

 two pairs of large eyes, that are nearly coalesced on each side; the 

 antennae and palpi are rather long, about of the same length as the head. 

 In none of the specimens the proboscis was protruded; though the exact 

 distribution of the paragnaths not could be recognized, it could be stated, 

 that they are absent on the adorai division of the proboscis. The maxil- 

 lae have a blunt distal extremity and are provided with five denticulations. 

 The parapodia of the anterior body-region are characterised by their 

 ligulae, having an elongate, cirrus-like appearance; the dorsal and the 

 median ligule are of the same length. The dorsal cirrus however is a 

 good deal longer and is not clavated as usually in the Heteronereis- forms. 

 In segment 4 and some of the succeeding ones an oval brown, glandular 

 spot is visible on the dorsal ligule, near the base of the dorsal cirrus. 

 The posterior lip of the neuropodial lobe is also elongated and extends 

 a little beyond the extremity of the ventral ligule; its anterior lip how- 

 ever only reaches to half the length of the posterior one and is rounded, 

 fan-shaped. The ventral cirrus does not extend to the end of the ventral 

 ligule. The aciculae are yellowish brown. The notopodial fascicle consists 

 of homogomph setigerous bristles ; the neuropodial one contains in its dor- 

 sal part heterogomph falcigerous and some homogomph setigerous setae, 

 whereas its ventral part consists of heterogomph setigerous and falcigerous 

 bristles. The parapodia of the median body-region have the swimming 

 bristles provided with a rather short terminal piece and a shaft with a 

 heterogomph distal extremity. Their dorsal cirrus bears a lamella at its 

 inferior and superior side, the latter being provided with a tongue-shaped 

 appendage. The large lamella of the ventral lobe is heart-shaped. 



