1910.] NATURAL SCIENCES OF PHILADELPHIA. 397 



ciliated on one (normally inner) face. Ciliated pads or ctenidia three, 

 two occupying the notopodial bay, the ventral one on the dorsum of 

 the notopodium; middle one nearly twice the length of the dorsal 

 which exceeds the ventral. Neurocirrus arises by a short cirrophore 

 near base of neuropodium ; style rather slender, tapered and reaching 

 beyond base of ventralmost setae; dorsal side curiously irregular, at 

 the base a short, blunt, spur-like process followed by a shallow depres- 

 sion and just proximad of the middle by a low swelling beyond which 

 the dorsal side exhibits a crenulated outline gradually deepening 

 toward the tip which is composed of two or three moniliform articu- 

 lations. 



Caudally the parapodia become relatively longer and anteriorly 

 the first four or five are directed more and more forward and become 

 longer, the first two pointing directly forward. Neurocirrus of II 

 about twice as long as the others. 



Acicula single in each ramus, stout, tapered, slightly curved, the 

 tip projecting a little. Notopodial setae in a dense olbique row, becom- 

 ing much longer toward the dorsal and posterior end from which they 

 rise in a long falcate pencil over the outer margin of the elytra. All 

 simple, capillary, very slender, and very finely setose with minute, 

 mostly opposite hairs. Neuropodials in a flattened horse-shoe-shaped 

 series open anteriorly, besides which there is an outer ventral curved 

 series reaching farther dorsad in front and a small, detached dorsal 

 tuft. The latter consists of three to five delicate, acutely pointed, 

 simple setae with tapering shaft and spirally wound fringe of twelve 

 to fifteen conspicuous turns, diminishing and becoming obsolete distally 

 (Pi. XXXIII, fig. 120). Associated with these there is often present on 

 anterior parapodia one or rarely two compound setae with the distal 

 end of the shaft provided with a spiral fringe of several turns and the 

 very long, slender, articulated appendage ending in a simple delicate 

 point (fig. 117). Most remaining neuropodial setae are compound 

 and on anterior segments have slender, tapering, articulated appen- 

 dages terminating in bifid tips which, however, may be so weak and 

 obscure on some of the more slender ones that this character may 

 appear doubtful. The largest and stoutest setae are in the posterior 

 side of the principal series and have short, few-jointed appendages 

 and obscurely bifid tips (fig. 116). The dorsal arc is formed of setae of 

 moderate thickness with the end of the shaft often ornamented with 

 several antrorse pectinae or spinulose rows and the elongated and 

 slender appendages with ten to fifteen articulations and distinctly 

 bifid tips. Those of the main ventral arc have quite smooth shafts 



