430 • PROCEEDINGS OF THE ACADEMY OF [Juiie, 



Nereis paucidentata sp. uov. (PI. XXIV, flgs. 2S. 29, 30.) 



The type and only specimen is complete but in several pieces, which 

 have a total length of 95 mm., with a maximum width of 6 mm. at 

 XV, There are 118 fully developed somites and a small caudal tip 

 of 6 regenerating ones. 



Prostomium slightly broader than long, broadly rounded anteriorly, 

 where it is about h the greatest breadth across the anterior eyes, 

 broadly excavated at the sides for the bases of the palpi. Eyes 2 

 pairs, both with cuticular lenses, large, the anterior slightly the larger 

 and farthest apart. Frontal tentacles short, awl-shaped, about equal in 

 length to the distance between the posterior eyes. Palpi reaching to 

 tips of frontal tentacles, the bases stout and swollen, the styles nearly 

 spherical, knob-like, partly retracted into ends of bases, and about ^ 

 diameter of these. 



Peristomium dorsally nearly ^ length of prostomium, its enlarged lat- 

 eral part f as long. Tentacular cirri rather short, the styles more or 

 less distinctly articulated, posterior dorsal reaching VI, anterior dorsal 

 V, posterior ventral III and anterior ventral II. 



The form of the somites presents nothing characteristic and the 

 caudal cirri are wanting. 



The parapodia resemble those of N. dumerilii, but the lobes are more 

 prolonged, and the dorsal cirrus has a more basal origin throughout the 

 series. The typical foot presents four principal elongated subequal 

 lobes, with a slender notopodial cirrus, about twice the length of the 

 lobes, arising from the swollen region near the middle of the dorsal 

 margin of the foot, and a neuropodial cirrus, about eciualling the ven- 

 tral lobe, from which it is separated by a short interval. The neuro- 

 podium consists of a rather truncate setigerous lobe, bearing a broad 

 presetal process, into which the aciculum enters, a much longer and 

 more narrow conical postsetal lobe, and a slender, conical, ventral lobe. 

 The notopodium is separated from the neuropodium by a deep narrow 

 cleft, and consists of 2 slightly divergent, elongated, conical, dorsal and 

 ventral lobes, between which the setae arise, guarded by a shorter, 

 flatter, presetal process, which is more closely connected with the ven- 

 tral lobe. Anteriorly the notopodial presetal process diminishes in 

 size and disappears entirely, with the setae, on the second foot; the 

 setigerous lobe of the neuropodium undergoes little change, but the 

 ventral lobe becomes large and thick, and more closely united with it. 

 The first and second parapodia have the dorsal non-setigerous lobe 

 only of the notopodium, and the ventral lobe of the neuropodium 

 considerably larger than the setigerous lobe and broadly rounded at 



