POLYCtL-ETA. 277 



The shelly tube is 40 millims. long by 10 mill'ims. wide. The tentaculum impar 

 stretches back over 12 segments; the prostomial tentacles are smooth, the basal 

 joints short, subequal, pauci-annulate. The tentacular cirri are slender, elongated, 

 -acuminate, much longer than the narrow buccal segment, about as long as the 

 prostomium. Branchiae simple, commencing on the 8th setiger ; stout, acuminate, 

 appearing flattened towards the base. Anal cirri long, slender, filiform. First three 

 setigers porrect, the first dorsal cirrus shorter than the following ; the fourth setiger 

 slightly porrect. Ventral cirri of first and second setigers subulate ; of the third, 

 shorter, obtuse, and fleshy ; of the fourth reduced to a slight projection of the first 

 torus ventralis. 



A large female measures 30 millims. long by 3"25 millims. wide; a smaller specimen 

 is 17 millims. in body -length (excluding the antennae), and the branchiae are flattened. 

 The frontal antennas are short, ovate. In the first foot there are no setae associated 

 with the dorsal cirrus ; the setae of this foot comprise two acuminate aciculae, three 

 bidentate acicular setae which project, and one or two bidentate quasi-compound setae. 

 A gill-bearing foot carries six limbate capillary setae, two aciculae, and two bidentate 

 acicular setae, the prongs of which are gaping and subequal ; there are no setae 

 passing to the dorsal cirrus. 



Onuphis dibranchiata, n. sp. Plate IV., fig. 100. 



Locality : Galle lagoon, low-tide, 3rd August, 1902. Several fragmentary specimens. 



The annulate bases of the prostomial tentacles are well developed, nearly equal, the 

 submedian slightly exceeding the others, and the median less than the rest ; the 

 submedian peduncles are less than one-third of the total length of the appendage ; 

 the median peduncle is barely one-fourth of the total length of the tentaculum impar, 

 and the lateral peduncles are about two-thirds the total length of the lateral antennae. 

 The submedian peduncles show twelve annulations in addition to the distal collar-like 

 portion into which the flagellum is inserted. 



In the above proportions it will be noted that the lateral antennae resemble those 

 of Onuphis basipicta. The frontal antennae are short and fusiform. The subulate 

 tentacular cirri are inserted behind the submedian antennae and slightly exceed the 

 length of the buccal segment. The branchiae commence as a simple filament on the 

 first foot and continue simple on the first 17 parapodia, becoming bifid thereafter and 

 considerably longer than the dorsal cirri. The first dorsal cirrus is tumid at the base, 

 rather shorter than the first gill-filament, equal in size and shape to the posterior 

 liffule of the first foot. 



The setae of the first foot do not afford such satisfactory distinction when compared 

 with the corresponding setae of 0. basipicta as might have been hoped. There is a 

 bundle of internal setae associated with the dorsal cirrus ; then three stout aciculae 

 ending in narrow flexible points ; next several slender quasi- compound setae like those 

 of O. basipicta, but in some of them the third tooth is absent. Besides these setae 



