178 THE ANNELIDA POLYCHAETA. 



line toward the caudal edge of the prostomium, projects dorsocephalad and 

 scarcely attains the anterior edge between the palps; each lateral tentacle is 

 attached at the anterior edge of the prostomium toward the outer border of the 

 palpus, along which it projects forwards and fails a little of attaining its anterior 

 end. There are four pairs of very small eyes, the four on each side forming a 

 transverse row caudad of each lateral tentacle; or, in one specimen, two are fused, 

 giving but three pairs of eyes. (Plate 28, fig. 1). 



The peristomium is a complete and exceptionally uniform ring longer than 

 the prostomium, and also a little longer than somite II. It is smooth and 

 undivided. Ventrally it presents a transparent, semicircular lower lip project- 

 ing a little cephalad of ventrad and having a smooth free edge. The mouth 

 is on the directly anterior surface beneath the prostomium, and is large; in it 

 is seen the proboscis, unprotruded in all the types, this showing radial folds. 

 On each side from the anterior edge, just above the lateral border of the lower 

 lip, where it incurves a little, arise two tentacular cirri; each is constricted at base, 

 above which it thickens considerably and then narrows to an acute point; short, 

 about equalling the somite in length, but much stouter than the tentacles. No 

 setae borne on the peristomium. (Plate 28, fig. 1). 



The metastomial somites are entire and smooth. Clearly separated from 

 each other in the middle and posterior region, but without intersegmental furrows 

 in the anterior region. The intersegmental furrows more marked ventrally in 

 other parts than dorsally. Somites cylindrical, being strongly arched above 

 and below, but ventrally showing a median longitudinal ventral furrow which 

 has probably become deeper in preservation. 



The segmental organs show as reddish organs through the integument of 

 rounded elevations on the caudal side and against the base of the parapodia, 

 the elevations low. These are distinct excepting on the fifteen to twenty most 

 anterior somites. A pore is visible on the surface of at least some of the ele- 

 vations. A reddish spot on a slight elevation may also show in front of the 

 parapodia. The pygidium is short, trapeziform, and bears two anal cirri; 

 these are short, only slightly longer than the parapodial cirri, and consist of a 

 short, proportionately thick, proximad article and a slenderly conical style. 

 (Plate 28, fig. 2). 



The parapodia are fully developed on all somites from the second, inclusive, 

 caudad and appear to be in essentials uniform. All are biramous, though the 

 notopodium is represented only by a low, broad elevation, into the apex of 

 which extends a well-developed aciculum and through which projects the stout 



