1909.] NATURAL SCIENCES OF PHILADELPHIA. 323 



convex, the anterior meeting in a rounded apex ; about twice as wide as 

 long. Eyes three pairs, forming a triangular group on each side; 

 the middle pair with distinct lenses and much the largest, but not more 

 than one-ninth the width of the prostomium and situated about their 

 diameter from its lateral border; the posterior also with lenses, di- 

 rected dorso-caudad, about one-fourth the diameter of the middle pair 

 and situated medio-caudad of them; the anterior* mere specks of pig- 

 ment without lenses situated in line with the posterior pair and eciuall}' 

 distant from the middle pair. Behind the posterior pair is a large 

 black blotch on each side. Palps prominent, projecting straight for- 

 ward, separate to the base, about one and one-half times as long as the 

 prostomium, broad at the base where they equal one-half the width 

 of the prostomium, thence diverging slightly and tapering to the rather 

 slender, bluntly rounded tips. Median tentacle arising posterior to 

 middle of prostomium between middle pair of eyes, lateral tentacles 

 close to base of palps laterad of anterior eyes; both slender, little 

 tapered, subequal, reaching about one-fifth of their length bej^ond 

 palps, strongly moniliform except at base, with twenty to twenty-two 

 joints. 



Peristomium (PI. XV, fig. 1) a short but distinct ring bearing two 

 pairs of tentacular cirri similar to cephalic tentacles but wath distinct 

 ceratophores, similar to the cephalic tentacles; the dorsal equal to 

 the latter and with twenty or twenty-one joints, the ventral two-thirds 

 as long with fourteen or fifteen joints. Segments all distinct, short, 

 uniannulate, slightly depressed, increasing in width to near the middle. 

 Pygidium a broadly expanded, furrowed ring whose cirri have been lost. 



Parapodia (PI. X\Vfig. 2) of a length generally about one-third the 

 width of their segments. Neuropodia thick, little compressed and 

 little tapered, divided distally into a low postsetal lip which curves 

 over and encloses the ends of the acicula, and a slighth' longer presetal 

 lip, the supraacicular portion of which is a small, blunt, projecting 

 lobe forming the dorso-distal angle of the neuropodium. Posteriorly 

 this lobe is much reduced and the postsetal lip becomes longer and 

 more pointed. Neurocirri nearly free from base of neuropodia ; 

 their cirrophores small and indistinct; styles slender, tapered, blunt, 

 longer than neuropodium and with a swelling on the doreal side abo\{^ 

 the base. Posteriorly they become more slender. Notocirri strongly 

 moniliform and very distinctly jointed (though the joints beconi(> 

 cylindrical rather than spheroidal or ellipsoidal) even to the caudal 



' Omitted from the figure. 



