276 PROCEEDINGS OF THE ACADEMY OF [April, 



which is somewhat obHqiiely prolonged. On at least the first bran- 

 chiate parapodium a few semicompound, sometimes acute (fig. 81), 

 sometimes obscurely hooked setae persist, but give place to true acute 

 simple setse on subsequent segments. A few short, simple setse occur 

 in the dorsal part of the supra-acicular region of the first foot, and they 

 soon form a well-marked, curved, horizontal series dorsal to the acicular 

 process. These setae are slender with a very narrow limbus. On 

 anterior branchiate parapodia, beginning with VI and continuing to 

 about XXX is a vertical row of five or six short, stouter, thickened, 

 but alimbate setse forming a vertical preacicular fascicle. These 

 disappear as the gills become short and the stout ventral crochets 

 appear, leaving only the dorsal group of acute setae, which become 

 longer. Beginning somewhere between VI and X, and at first few 

 in number, but increasing to a compact tuft clustered among the 

 dorsal acute"setae and persisting with them to the end of the worm, are 

 delicate gouge-shaped setae with finely pectinate border (fig. 82). A 

 stout yellow crochet (fig. 83) appears below the acicula at about XXX 

 and a few segments behind is joined by a second; they have a strong 

 beak, short, thick accessory tooth and a pair of small guards. 



Mandibles dark brown with pale masticatory plates. Stems rather 

 broad, of nearly uniform width, the distal end scarcely widened, the 

 two sides very slightly united l^y a slender and short isthmus. Mas- 

 ticatory plates small, transversely elliptical, scarcely toothed (fig. 84). 

 Maxillae (fig. 85) dark brown, massive, opake. Forceps jaws (I) 

 massive, the carriers broad, together nearly orbicular with a flexible 

 median joint and a posterior median notch; hinge line short; forceps 

 with basal half thick, tapered to the incurved subacute ends. Maxillae 

 II broad, triangular, the cotype figured with the inner left plate absent, 

 the remaining pair nearly symmetrical, the left with seven, the right 

 with eight teeth, the most anterior in each case being larger than the 

 others. The type has the normal arrangement of two pieces on the 

 left side and one on the right, each bearing seven teeth like those 

 figured. Maxilla III large curved plates usually with eight unequal 

 teeth on each side. Maxilla IV small plates bearing a smgle small 

 tooth. 



Color generall}^ faded to a dull gray, the anterior end slightly pur- 

 plish and purple zones on the cephalic tentacles and spots at the base 

 of the nuchal cirri. Cuticle slightly iridescent. 



Some fragments of the exposed ends of tubes have the usual structure, 

 with a tough, parchment-like basis thickly covered with pebbles, bits 

 of shells, coral and other hard bodies mostly arranged transversely. 



