262 PROCEEDINGS OF THE ACADEMY OF [April, 



single newly erupted smaller one on III (fig. 46) shows that they are 

 bidentate and guarded at the tip, but apparently not articulated. 

 Limbate setae and pectinate setae (fig. 47) begin on the second foot, 

 on which the type specimen bears in a dorsal fascicle several of the 

 former and one of the latter. Beginning with the fourth foot and 

 continuing to the caudal end there are both dorsal and ventral small 

 fascicles of limbate setae. They have rather long stems and gently 

 sigmoid, tapered and very acute ends bearing lanceolate, bilimbate 

 blades. They become longer posteriorly. Delicate colorless pectinate 

 setae (PI. XVI, fig. 47) occur among the bases of the dorsal limbate 

 setae from III to the caudal end and, except on the first two or three 

 parapodia, form a dense cluster. The ends appear to be funnel-form 

 with about one-third of the circle cut out and the border striated and 

 finely denticulated. Ventral crochets begin on V, at first single and 

 slender, but after about XV there are two or three. Two very stout 

 yellow ones (fig. 48) are characteristic of the middle region. These 

 have fibrous cores and slightly curved shafts, swelling distally, then 

 rather abruptly contracted to the small head which is terminated by 

 two rather long processes placed at nearly a right angle to the shaft 

 and enclosed in a pair of narrow, subtriangular guards. The terminal 

 teeth become shorter on anterior segments. 



Jaws described from the cotype. Mandibles chiefry dark brown 

 except the masticatory plates which are white with two or three very 

 dark brown lines across the basal part (PI. XVII, fig. 49). The two 

 halves are very lightly united; the stems of nearly uniform width, 

 with slightly expanded distal ends grooved to bear the masticatory 

 plates which are elliptical with irregularly crenulated free margins. 

 Maxillae (fig. 50) massive, dark brown, hard. Carriers of forceps jaws 

 very broad in posterior half, about one and one-fourth times length, 

 the posterior border broadly rounded. Forceps rather long and 

 slender, strongly hooked with acute tips. Maxilla II, left outer plate 

 with nine teeth, of which the first is very large and widely separated 

 from the second very small tooth by a wide bay fitting the anterior 

 end of the left inner plate, which bears nine regular stout teeth ; right 

 plate very large with ten large, somewhat hooked teeth. Maxillae 

 III, narrow curved pieces, the left bearing ten, the right thirteen teeth. 

 Maxillae IV, small plates bearing a single tooth on each side. 



Color all faded out with the exception of small brown spots at the 

 base of the gills. 



Described from two specimens (of which the cotype is filled with 

 sperm balls) both from station 4,387, off San Diego, Lat. 32° 32' 40" N., 

 Long. 11S° 04' 20" W., 1.059 fathoms, green mud. 



