382 PROCEEDINGS OF THE ACADEMY OF [April, 



border bearing six or seven lobes most of which are again divided into 

 two or three finger-like papillae each with a terminal sense organ 

 (PL XXXII, fig. 86). 



Parapodia of the usual form, the neuropodia shorter and stouter 

 than in ^4. refulgida, terminating in the usual three step-like folds, 

 and on the ventral face thickly crowded with short pediceled globular 

 papillae, the largest of which occur at the bases of the setae. Neuro- 

 cirri arise at about middle of ventral face of neuropodia and reach 

 bases of middle series of setae. They are "slender, especially in the 

 distal half, and end in slightly bulbous tips. No sensory cilia on 

 style but a close cluster of somewhat enlarged spherical papillae round 

 the base. Notocirri project through the felt at the ventral border 

 of each lateral tuft of notopodial setae and curve freely dorsad and 

 caudad to a point about opposite the middle of the next succeeding 

 homologous tuft. They arise from large ceratophores and the styles 

 are slender with scarcely obvious subterminal enlargement or ter- 

 minal bulb and no sensory cilia. Notopodium a scarcely elevated 

 tuberosity receiving the end of a stout aciculum. Toward the ends 

 both rami become more prolonged, the neuropodium slender and the 

 notopodium compressed and somewhat spade-shaped. Peristomial 

 parapodium much prolonged forward and the rami united to the end, 

 the notopodium only retaining an aciculum and the setae though 

 differentiated into fascicles being all of one kind. Xeurocirrus of II 

 about twice as long as the others. Cirri of the much crowded caudal 

 parapodia, which approach each other ventrad, have exaggerated 

 subterminal and terminal thickenings and the notocirri are relatively 

 longer, neurocirri shorter than on middle segments. 



Dorsal felt covering somewhat thinner than on A. refulgida and not 

 distinctly differentiated into two layers, but continuous and of uniform 

 thickness; formed of a close web of fine dull gray fibers and coated 

 externally with silt. As noted above the notopodial setae are very 

 conspicuous and the neuropodial spines are freely exposed and project 

 prominently at the sides. Neuropodial setae in the usual three series, 

 medium sized specimens like the type having commonly two in the 

 dorsal, three or four in the middle and six to eight in the ventral 

 series. All are dark brown, the dorsal ones being especially deep and 

 exhibiting the most splendid bronzy reflections. Dorsal setae (Pi. 

 XXXII, fig. 92a) are nearly straight and retain but little hairyness. 

 Ventral ones (PI. XXXII, fig. 92c, and PL XXXIII, fig. 98) are about 

 one-fourth diameter of the dorsal, more curved, with distinctly enlarged 

 and densely pilose ends on which the hairs form a dense cushiony 



