SEA-FISHERIES LABORATORY. 311 



portion (smooth, in the figure) is covered with closely set 

 rounded papillae too small to be shown. Prostomium, 

 segmentation, annulation, parapodia, gills and nep'hridio- 

 pores also shown. Natural size. 



Fig. 2. Anterior end of a littoral specimen about 

 GO mm. long. Ventral aspect. In front the mouth is seen 

 surrounded by a series of papillae. Behind the " upper 

 lip " the three lobes of the prostomium are seen lying 

 retracted in the nuchal organ. Xote the metastomial 

 grooves uniting in third annulus at anterior end of groove 

 below ventral nerve cord. Segmentation and annulation 

 in relation to the internal septa also shown. Of. region 

 between second and third chaetigerous annuli in figs. 1 

 and 2. x 6. 



Fig. 3. Portion of "proboscis " from fig. 1, to show 

 the buccal papillae, which gradually merge into the 

 epidermal papilla? of the peristomium. x 9. 



Fig. 4. Chitinoid caps from the tips of the buccal 

 papillae. x 24. 



Figs. 5, 6. Dorsal and ventral views of the anterior 

 end of a large littoral specimen, 840 mm. long. The 

 " proboscis " is half extruded, cf. figs. 1, 2. 



Fig. 5. Dorsal aspect, showing the trilobed prosto- 

 mium fully extended, the origin of the two metastomial 

 grooves, the apertures of the otocysts, the sculpturing of 

 the skin, &c. Each of the first four annuli is subdivided 

 into two. The first two annuli form the peristomium, the 

 third and fourth represent a body segment from which the 

 setae have disappeared. The first chaetigerous annulus and 

 the following annulus represent the first chaetigerous 

 segment, x 3. 



Fig. 6. Ventral aspect, showing metastomial grooves, 

 groove below ventral nerve cord, and very small neuro- 

 podia of first chaetigerous segment. x 3. 



