UNCINEREIS. 215 



ture. In the other parapodia the setae of the notopodia continue to be all 

 ahke and of the slender type; but in the neuropodium some much stouter setae 

 occur, these having a diameter three times or more that of the more slender 

 ones. Blades of the stouter setae short, socket lateral and obhque, below distal 

 end of shafts. The blades of the ordinary setae moderately long and acuminate, 

 the tips capillary and moderately curved; the blade mth a series of short hairs 

 or teeth along the concave side, excepting distally. Socket symmetrically formed 

 in the regularly expanded distal end of the stem. (Plate 35, fig. 6, 7). 



Paragnatha absent from basal region. In I are two paragnatha, one in 

 front of the other. In IV a row of three stout pai'agnatha, those of III few, those 

 of II uncertain. jVIaxillae black, cutting edge proximally entire, distally wavy, 

 forming two or three inconspicuous crenulations. 



Body anteriorly reddish, becoming m the middle and the caudal region 

 yellowish. Parapodia yellow, the contents of a large basal region of notopodia 

 showing as a black dot in the middle and caudal region. A whitish area on base 

 of prostomium. 



Locality. Paumotu Archipelago: Fakarava. Fringing Reef. 12 October, 

 1899. One specimen. 



Characterized especially by its short prostomium, long peristomium, un- 

 usually short tentacular cirri, and the two paragnatha in area I. 



Uncinereis, gen. nov.^ 



Prostomimn with broader posterior region and a preocular region narrow- 

 ing anteriorly. Two pairs of eyes. Tentacles two, attached anteriorly and 

 projecting forwards. Palps large and two jointed, the distal article compara- 

 tively large. 



Peristomium bowed forward above and ventrally extended caudad into a 

 broad excavation in the second somite. Bearing four pairs of tentacular cirri 

 in which ceratophores are weU. developed. 



Parapodia biramous, each branch bilobed, and the notopodial setae emerg- 

 ing in the interval between the two upper lobes. The lobes of from four to 

 seven pairs of parapodia following the first foiu- pairs, subspherically swollen, 

 all others conicaUy pointed. 



Setae of three types, composite setae of homogomph and heterogomph 

 forms, and in addition stout crochets present in most notopodia. 



' uncinus, hook, hooked seta, and Nereis. 



