108 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



Genus LEPIDONOTUS Leach 



LEPIDONOTUS CAELORUS Moore 



FiGUBE 35, h-d 



Lepidonotus caelonis Mooke, 1903, p. 412 (U.S.N.M. no. ir)733 ; Japan). 

 Polynoc spicula Treadweix, 1900, p. 1151 (U.S.N.M. uo. 5203: Monterey Bay). 

 Lepidonotus minutus Tbeadwell, 1936, p. 202 (U.S.N.M. no. 20112; China). 

 ? Lepidonotus castriensis SfSDhER, 1924, p. 41. 



The type vial of PoJyno'd spicula contains three specimens. Each 

 has 12 pairs of elytrophores, inserted as typical of the genus Lepido- 

 notus. The prostomium has long anterior peaks and a stout median 

 ceratophore; lateral antennae are inserted terminally (fig. 35, c). 

 The scales are ornamented with spines and a marginal fringe (fig. 

 35, d). Neuropodial setae are distally entire and have a stout tooth 



FiGUKB 35. — Species of Iphione and Lkpidonotl'S 

 a, I phi one fustis Hoaulanil : Fifteenth neuropodium in posterior view, X 45. 

 b~d, Lepidonotus caelorue Moore (figures based on type of Polynoc spicula Treadwell) : 

 b, Twelftli foot In anterior view, X 45 ; c, prostomial outline, X 45 ; d, an elytron 

 from posterior third of body, X 28. 



at the distal end of the toothed region. Parapodia are blunt, trun- 

 cate (fig. 35, b). In both the types of L. caelonis and P. spicula the 

 posteriormost scales have the most conspicuous spines. Numerous 

 collections show variation, however, in relative sizes of spines. 



The type of Lepidonotus minutus Treadwell is a small representa- 

 tive of this common north Pacific species. The prostomium is 

 strongly retracted into the peristomial ring, and the posterior margin 

 is thus made out with difficulty. It may be for this reason that the 

 illustration of L. minutus shows the prostomium more produced at its 

 posterior margin than is actually the case. The elytra of the type 

 are strongly mottled with dark gray. There is great variation in 

 pigmentation of this species (see also Moore, 1905, p. 546). The 

 lengths of lateral and median antennae in the original descriptions of 



