's RIJKS MUSEUM VAX NATUURLIJKE HISTORIE — LEIDEN. 15 



Lagisca Pottsi Horst. 



{Pohjnoë longicirrus Potts) 1 ). 



Siboga-expedition, Stat. 51, Molo-strait ; Stat. 164, South off Sala- 

 watti-island. 



Of this species, characterised by its long dorsal cirri as well as by 

 the peculiar shape of its inferior neuropodial bristles, specimens were 

 met with at the above-named stations. Potts appears to have overlooked, 

 that the name of Pohjnoë longicirra was already given by Schmarda in 

 1861 to an other Pol ynoid- worm from Ceylon 2 ); therefore I propose to 

 call the species, first described by him from the Maldives, that presu- 

 mably belongs to the genus Lagisca: Lag. Pottsi. 



Lagisca cornuta Potts 3 ). 



Siboga-expedition, Stat. 100, Soeloe-sea; Stat. 139, north off Batjan; 

 Stat. 173, off east-coast of Ceram ; Stat. 262, west off Great Kei-island; 

 Stat. 266, off Kei-Islands. 



From a depth of 397 to 595 M. at the above named Stations speci- 

 mens of a Lagisca were collected, that must be identified with Lagisca 

 cornuta Potts, characterised by its short lateral antennae and by its large 

 eyes. Only the specimen of Stat. 173 possesses some elytra and these 

 much agree with the scales of Lag. crosetensis Me Int. 4 ) ; their surface 

 is covered with spines, that commence anteriorly as minute tubercles 

 and their posterior and outer border are also fringed with cilia. 



Lagisca (Pohjnoë) minuta Potts 5 ). 



Siboga-expedition, Stat. 99, anchorage off North-Oebian. 



A small, badly preserved worm, that lacks all the elytra as well as 

 most of the dorsal cirri, must be identified with this species ; it is cha- 

 racterized by the great difference in length and appearance of the ventral 

 and the dorsal bristles of the neuropodial fascicle. 



Lagisca elytrophora n. sp. 



Siboga-expedition, Stat. 273, anchorage off Poeloe Jedan (Aroe-islands). 



The head shows a conspicuous median dorsal groove, from which the 

 basal part of the tentacle arises ; its distal joint is slender, pointed, 

 nearly as long as the head ; the lateral antennae are short, as long as 



1) Loc. cit. p. 336, PI. XVIII, fig. 9, PI. XX, fig. 29, PI. XXI, figs. 37 aud 38. 



2) Loc. cit. p, J 52, PI XXXVI, fig. 309. 



3) Loc. cit. p. 339, PI. XIX, fig. 14, PI. XXI. fig. 48. 



4) Challenger-Annelida, p. 88. 



5) Loc. cit. p. 337, PL XIX, and XXT, figs. 12, 31, 42 and 43. 



