64 ZOOLOGISCHE MEDEDEELINGEN — DEEL V. 



The inferior ligule has the shape of a ploughshare. At the base of the 

 dorsal cirrus a narrow, palette-shaped lamella occurs; at the base of the 

 ventral cirrus dorsally some branched appendages are situated, whereas 

 ventrally a lamellar lobe is visible. The cultrate setae are faintly hete- 

 rogomph and bear a terminal piece, that is denticulated along one border 

 and provided with an acute apex. 



South off Flores by Dr. van der Sande a Heteronereis-specimen was 

 captured, that according to the armature of the proboscis and the shape 

 of its parapodia must be considered to represent a female specimen of 

 Ceraton. ramosa. It has a length of about 70 mm. and is pale-brown 

 coloured, with a transverse, white band in the intersegmental grooves 

 of the anterior segments, and some oblique white lines on their lateral 

 parts. The armature of the proboscis consists of: 1 = 3 large, conical 

 paragnaths, one behind the other ; II = a crescent row of 8 paragnaths ; 

 IV = 4 to 5 paragnaths on a common plate ; III = a longitudinal row 

 of 3 paragnaths and a single one on each side at some distance. In the 

 8 th parapodium the stout falcate bristles of the dorsal part of the neu- 

 ropodial fascicle already show a conspicuous tendency to anchylosis of 

 the terminal piece ; its dorsal cirrus is rather long and extends a good 

 deal beyond the distal extremity of the dorsal ligule. This cirrus along 

 the basal part of its ventral side is beset with a longitudinal group of 

 small papillae, situated upon a dark-coloured (? glandular) tissue. In the 

 succeeding parapodia the ligules and parapodia! lobes grow more slender 

 and aculeated and the number of stout falcigerous setae in the neuro- 

 podial fascicle decreases, whereas with the 25 111 parapodium the epitocous 

 transformation commences and besides the cultrate bristles only a single 

 stout, hook-shaped seta is visible in the ventral lobe. 



This species much resembles Ceratonereis paclujchaeta, the atokous 

 form of which was described by Fauvel from Djibouti and Madagascar *); 

 it has nearly a similar armature of the proboscis and in the ventral 

 lobe of the parapodia stout, heterogomph, falcate bristles, with anchylosed 

 articulation. Fauvel however does not mention that the paragnaths of 

 the different groups are placed on a common basal plate and according 

 to his description group I should only consist of a single paragnath. 



Gymnorhijnchus : Zoolog. Mededeelingen, Dl. IV, p. 247. 



This name ought to be cancelled, because it already has been used 

 by Rudolphi (Entozoorum Synopsis, p. 129) for a 'tape-worm; I propose 

 to replace it by Gymnonereis. 



1) Bullet. Muséum d'Hist. natuv. 1918, p. 506. 



