POLYCHyETA. 249 



Microscopic examination shows that the verrucose appearance of the anterior scales 

 is due to the presence of large numhers of spheroidal echinulate papillae (Plate I., 

 fig. 9). These papilla? do not occur on the posterior scales, which owe their granulose 

 appearance to the ordinary carinulate papilla? (Plate I., fig. 8), small stellate papilla? 

 and smooth globoidal papilla?. 



The elytra of this species show an analogy with those of Marenzeller's Lepido- 

 notus pleiolepis from Japan, which, however, possesses fifteen pairs instead of the 

 usual twelve pairs. Some individuals show a narrow black ring round the lower part 

 of the subtermmal dilatation of the dorsal cirri. In a specimen with extruded 

 proboscis the outline of the prostomium was nearly circular. 



This species appears to be the most abundant and typical representative of the 

 genus Lepidonotus on the Ceylon pearl banks. 



Lepidonotus cristatus, Grube. 



Grube, 'Ann. Semp.,' 1878, p. 27 ; Gravier, 'Ann. Mer Rouge,' 1901, p. 212. 



A. fine example of this species, 43 "5 millims. in length, 17 millims. wide over the 

 seta?, was taken on the Galle Reef under a boulder, 7th June, 1902. 



The smooth-bordered elytra show a large tumid bilobed transverse crest. The 

 ventral seta? have the usual laciniate fringes on the region of the subtermmal 

 dilatation and end in a smooth curved tip. The distal portions of the antenna?, 

 tentacular cirri, dorsal cirri and first ventral cirrus, up to the subtermmal bulb, are 

 coloured black. 



Gravier describes for the first time the modified ventral seta? of the second 

 segment, which are characterised by the possession of a very long verticillate tract, 



Lepidonotus trissochsetus, Grube. 



Grube, 'Ann. Roth. Meer.' (Ehrenberg coll.), 1869; 'Ann. Semp.,' 1878, p. 25. 



Locality: South-east Cheval Paar. Length of the specimen 12 millims., breadth 

 over the seta? 5 millims. 



This species is distinguished by the possession of two kinds of seta? in the dorsal 

 ramus of the parapodium, and these seta? are very numerous. There are rather short, 

 stout, transversely spinulose seta? of a common type, and enclosed by these are numerous 

 fine smooth capillary seta? ending in a point, a short distance below which there is a 

 delicate dilatation, as in a spear-head without barbs ; these may be called hastate 

 seta?. In the anterior half of the body the hastate seta? .do not project beyond the 

 spinulose seta? which surround them, and cannot therefore be seen without adopting 

 special measures. In the posterior half the hastate seta? project far beyond the short 

 spinulose seta?, which occur like a sheath at the base of the bundle ; they project here 

 as far outwards as the ventral seta?. The resulting difference between the anterior 

 and posterior dorsal fascicles as seen under low magnification is very pronounced. It 



2 K 



