'« TtrJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 3 



same species ranged by different authors in six different genera. Augener l ) 

 therefore proposes to cancel the genera Encrante, Eunoa, Eupolynoë, 

 Evarne, Laenilla, Nychia and Parmenis and to unite them with the genus 

 Harmothoë, and Johnston prefers to range all the Polynoids under two 

 genera: Polynoë Sav. and Harmothoë Kinb., nearly corresponding with 

 the „Polynoën der ersten Keihe" and „Polynoën der zweiten Reihe" of 

 Grube 2 ) ; however the American author has overlooked that to the last 

 group there belong some species, that have more than forty somites and 

 much more than twelve to fifteen pairs of elytra. Though I fully agree 

 with Augener about the desirability to cancel some of the old genera, 

 I cannot follow Johnston's example to omit all of them and I prefer in 

 accordance with Grube (and Ehlers) to maintain two large groups : 



I. Lepidonotidae : the lateral frontal lobes of the prostomium prolonged 

 to form the basal joint of the paired antennae. 



II. Harmothoïdae : the lateral frontal lobes of the prostomium produced 

 into two acuminate or rounded peaks, beneath which the paired antennae 

 arise. 



Of these groups the second appears to represent the eldest one, be- 

 cause Marenzeller has observed, that in the juvenile state of Lepidasthe- 

 nia elegans 3 ) (Polynoë lamprophthalma Mrz) the lateral antennae arise 

 beneath the frontal margin 4 ). 



I. Lepidonotidae. 

 Lepidonotus Leach. 



Including only those species, that consist of 27 somites, and are pro- 

 vided with 12 pairs of elytra; notopodial bristles all similar. 



Lepidonotus acantholepis Grube 5 ). 



Siboga-expedition, Stat. 50, bay of Badjo, west-coast of Flores ; Stat. 

 220, anchorage off Pasir Pandjang, west-coast of Binongka; Stat. 234, 

 Nalahia-bay, Noesa-laut island; Stat. 285, south-coast of Timor. 



This species, mentioned by Grube from Oepoloe and the Philippines, 

 and afterwards found by Driesch in the neighbourhood of Ceylon °), was 



1) Polychaeten von Franz-Joseph-land: Zoolog. Auzeiger, Bd. XLI, 1913, p. 202. 



2) Bemerk, über die Familie der Aphroditeen, III, Polynoina: Sitz.ber. Schles. Gesellsch. 

 Vaterl. Kultur, 1875. 



3) Zur Kenntniss der Adriatischen Anneliden, II, Sitz.ber. K. Akad. d. Wisseascb. Wien, 

 le Abtb. Vol. LXXII, 1875, p. 139. 



4) ibidem Vol. LXIX, 1874, p, 408, PI. I, fig. 1. 



5) Annulata Semperiana, p. 24, PI. II, fig. 1. 



6) Michaelsen, Polycbaeten yon Ceylon, 1892, p. 5. 



