LEODICIDAE. 229 



The setae of the notopodia are all of the ordinary slender type. In all 

 neuropodia there are in addition much stouter setae, with shorter blades. In 

 the setae of the stouter type the shaft is weakly curved; the socket is very 

 obUque; the blade is small, conspicuously concave on the side on which the 

 higher edge of the socket occurs, in the ordinary setae the sockets are homo- 

 gomphous; the blade is long and distally capillary. (Plate 35, fig. 4, 5). 



Paragnatha well developed on both basal and maxillary rings. V with a 

 single transversely elongate tooth or lamella ; VI with a larger transverse lamella 

 which is more or less divided into two parts; VII and VIII with teeth in a double 

 transverse row, these teeth conical and somewhat flattened. The teeth in 

 IV are in five or six closely ordered transverse rows, and are cognate at base in 

 each series (pectinate). The teeth are similarly pectinate in four series in II. 

 Teeth of I and III uncertain. 



The body in general is a somewhat dilute and nearly uniform brownish. 

 The tips of the parapodial lobes and the cirri are paler. 



Locality. Tonga Islands: Nomuka. Taken on beach rock. 2 December, 

 1899. Four specimens. 



Especially distinctive of this species is the presence on the proboscis in I 

 of a distinctly lamelliform transverse tooth, or plate, together with the numerous 

 seriate or pectinate teeth in II and III. It has resemblances to P. galapagensis 

 (Kinberg). 



Leodicidae. 



In this large family the body is long and more or less cylindrical, and is 

 composed of numerous, essentially similar, short somites. The integument is 

 smooth and commonly iridescent. 



The prostomium is distinct. It bears a pair of palpi. The number of ten- 

 tacles varies from one to five, but frontal tentacles are never present. They are 

 either subulate or may be very elongate distad of the basal region ; a ceratophore 

 often distinct, and the style may be smooth or more or less annulated. Eyes 

 two or none. Nuchal organs in the form of ciliated grooves. 



The peristomium is biannulate and may or may not bear a pair of nuchal 

 tentacular cirri upon the second annulus. 



The parapodia are uniramous. Each bears a dorsal and a ventral cirrus. 



A certain number of the notocirri may bear branchiae. The branchiae 

 may be simple filaments or more or less highly branched. Sometimes they are 

 rudimentary and may be wholly absent. 



