628 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



split medianly, thus being divided into two peduncles (figs. 14-15), 

 supporting on their anterior ends the opercular region, the latter con- 

 sisting of two slightly concave elliptical areas, eacli surrounded by 

 a single row of paleae. Paleae of the simple unserrated type, but 

 of two varieties. Median paleae (fig 16). golden in color, resembling 

 in form the simple acicula of Leodicidae. Outer paleae (fig. IT) 

 pale in color, with termination narrow and more attenuated than that 

 of the median paleae. Moderately long conical opercular papillae, 

 11 on each side, situated external to the paleae. Opercular region 

 diverging slightly dorsally, the posterior limits being provided with 

 large, dark brown hooks opposite each other (fig. 14). Filiform 

 branchiae borne on median opposing faces of the peduncle-, and on 

 seven oblique ridges on the ventro -lateral surface of the peduncles 

 (figs. 15-18). (rill filaments, seven to eight on each ridge. First 

 four ridges on each side marked with distinct black pigment spot 

 (fig. 18). Large median cirrus (fig. 14) deeply pigmented distally, 

 arising dorsally between the hooks and extending dorso- ventrally 

 between the peduncles for a distance of 4 mm. Mouth situated ven- 

 trally; bounded dorsally by a pair of deeply grooved palps, 0.5 mm. 

 in width, laterally by two large, flat, labial processes (fig. 15), and 

 ventrally by the lower lip. Prominent conical cirrus (fig. 15) situ- 

 ated on each side lateral to labial processes, provided at the base with 

 a fascicle of simple capillary setae (fig. 19). 



Somite II provided laterally with four conical cirri (fig. 18), the 

 most dorsal being the longest and constituting the first of the dorsal 

 branchiae. Somites III, IV, V, VI bearing ventrally papilla-like 

 tori, having two types of setae. Largest type (fig. 20) paddle-shaped 

 with frayed termination. Smaller type (fig. 21), simple capillary 

 setae, alternating with the paddle-shaped setae. Somites III. IV, V, 

 and VI bearing dorsally stout rectangular pinnulae, with setae simi- 

 lar to figure 20, but three times larger. Branchiae arising medianly 

 to bases of rectangular pinnulae. 



First nine abdominal somites bearing branchiae dorsally and un- 

 cinigerous ruffle-like tori laterally, the latter ending ventrally in a 

 small free lobe overlying a ventral tubercle and small setae tuft. 



Uncini (fig. 22) pectinate with double row of seven teeth each. 

 Ventral setae of two kinds — delicate capillary and slightly heavier 

 spinous (fig. 23). 



Ventral tori decreasing gradually in size from the tenth through 

 the seventeenth. Occurring as long stalked processes from the eigh- 

 teenth through the twenty-fifth. 



Tube of fine white stones, Foraminifera shells and bits of red coral 

 cemented together. 



Type collected at station D5109, Corregidor Light off Luzon. 10 

 fathoms, coral bottom. 



