2J0 PROCEEDINGS OF THE ACADEMY OF [April, 



neuropoclium in length. Instead of increasing in length and becoming 

 cirriform and highly vascular caudally, as is the case with most species 

 of Lumbrineris inhabiting this region, the postsetal lobe, if changed at 

 all, becomes somewhat smaller posteriorly and never shows any 

 indication of becoming erect. A minute papilla at the dorsal side of 

 the base of the neuropodium represents the notopodium. 



Neuropodial acicula two or three, pale brown, of the usual tapering 

 form, the tips not appearing beyond the surface. Notopodial acicula 

 very delicate, their ends imbedded in a spherical opake mass. 



Setae all colorless, of the usual simple limbate and hooded crochet 

 types, the former on the first thirty to forty segments only, the latter 

 on all segments. The number of setae is moderate, their distibution 

 on the type being as follows: the first foot (III) has seven limbate 

 seta? and two articulated crochets; X has five limbate setae in the 

 supra-acicular fascicle and four articulated crochets and one limbate 

 seta in the subacicular fascicle; XXV has three supra-acicular lim- 

 bate setae and two subacicular crochets, of which the ventralmost is 

 simple; middle parapodia have three or four simple crochets, with 

 which a limbate seta may be associated as far as XL. Other examples 

 have a practically similar distribution, but the last compound crochet 

 may occur at XVIII and the first simple one at XVII. The limbate 

 setae (PI. XIX, fig. 130) are in no way characteristic; they are rather 

 sharply bent, very acute and the blades narrowly lanceolate. Crochets 

 of anterior parapodia (PI. XIX, fig. 131) are imperfectly compound, 

 with an oblique articulation that divides the stem but not the hood, 

 which is, however, adherent to the stem in such a manner as to produce 

 a rather pronounced double inflation; the stem terminates in a high, 

 finely divided crest. Simple crochets (fig. 132) have a short, strongly 

 inflated hood and a long-beaked head surmounted by a crest of fine 

 teeth. 



Jaws much like those of L. hebes Verrill. Mandibles in one specimen 

 rudimentary, in another (PI. XX, fig. 133) colorless and delicate, 

 stems long and slender, united by their anterior halves ; masticatory 

 plates very oblique, separated by a deep anterior cleft, each when 

 intact with a large apical and a somewhat smaller internal tooth. 

 Maxillae (fig. 134) dark brown, carriers of forceps jaws (I) with halves 

 very imperfectly united, slender, a deep incision on each side in anterior 

 third, the part posterior to which is more than twice as long as wide 

 and acutely pointed behind; hinge well-developed; the forceps 

 moderately stout in basal third, strongly hooked distally. Large 

 tooth plates (II), with stout body and large outstanding quadrate 



