334 OBSERVATIONS ON THE CHLORAEMIDAE, 



most anterior segments are constricted. The surface is of a dull 

 brown colour, without a distinct layer of mucus, encrusted on the 

 dorsal surface for some little distance at the anterior end with 

 firmly fixed and closely set sand-grains.* The papillae are not 

 very numerous or very prominent, scattered over the surface, 

 with a tendency to the formation of irregular transverse rows ; 

 they are equally developed on the dorsal and on the ventral 

 surface. On the elevations from which the elongated setse of 

 the two anterior segments spring, there are papillae of a slightly 

 greater length than those on the general surface of the body. 

 Each papilla is situated on a little elevated area. 



The segments are not very distinct in the anterior swollen 

 part of the body, but are much more evident behind. The 

 parapodia do not project from the surface. The seta? of the 

 first two segments are 40-50 in number, slender, slightly curved 

 inwards, directed forwards. On each of the other segments there 

 are three or four very slender dorsal seta3 and three stouter 

 ventral seta?. The former are transversely striated, as is usual 

 in this family ; they are rather longer than the segments ; the 

 latter have a short terminal segment, which is unjointed, curved, 

 and pointed, articulating with the elongated, transversely striated 

 basal portion ; the ventral seta? project more prominently from 

 the surface in the anterior segments than in the posterior. 



Specimens of this species, together with the following, were 

 got with the dredge near Watson's Bay in Port Jackson. It 

 belongs to that section of the genus to which Grube refers S. 

 parmatus, Gr., S. Cariboum, Gr., and S. cingulatus, Gr., and to 

 which also S. cajiensis, Mcintosh, belongs — all these forms being 

 characterised by the presence on the dorsal surface of the anterior 

 part of the body of a space covered with closely cemented sand- 

 grains. I cannot identify the Port Jackson species with any of 

 these. 



* A similar feature is described by Grube ["Annulata Semperiana," 'M6m. 

 de l'Acad. Imp. des Sci. de St. Petersbourg,' vii. serie, t. xxv. (1878)] in his 

 Stt/larioides parmatns from the Philippines, and by Mcintosh in Troj>honia 

 capemis (" Challenger" Reports, Annelida). 



