248 THE ANNELIDA POLYCHAETA. 



stomium is longer relatively to the succeeding somites. The tentacular cirri 

 are distinctly longer, reaching the middle of the prostomium instead of only 

 near the middle of the peristomium, and they are more distinctly annulate. The 

 tentacles are decidedly longer and consist of more articles, the inner paired ones, 

 e. g., reaching the ninth somite instead of only the fourth and consisting of 

 twenty articles instead of fourteen. The pectinate setae are much smaller and 

 have the clavate apical piece relatively decidedly longer and narrower. In 

 the compound setae the apical piece has the subapical tooth farther distad and 

 relatively larger; and the setae as a whole are much coarser. The crochets 

 are very close in size and structure. The mandible has its anterior margin 

 distinctly dentate instead of essentially smooth, and the united pieces are pro- 

 portionately broader. 



Leodice oliga papeetensis, subsp. nov. 

 Plate 55, fig. 8-10; Plate 56, fig. 1. 



This form is represented only by the anterior portion of one specimen. 

 This fragment, consisting of thirty-seven somites, is about 8.5 mm. long, with 

 a maximum width o,f 2 mm. 



The general color is dark yellow without distinct markings. The tentacles, 

 parapodia, cirri, and branchiae are paler, whitish. 



The tentacles are slender and strongly annulate as in oliga, the articles 

 similarly short and submonihform. The median reaches somite XI and con- 

 sists of twenty articles; it may have lost some terminal articles. The inner 

 paired tentacle reaches somite V on one side and consists of fourteen articles; 

 on the other reaches somite XI and consists of eighteen somites, the tip of the 

 first evidently having been broken off. 



The tentacular cirri are very slender and at present do not extend beyond 

 the anterior margin of the peristomium. 



The branchiae begin on somite VII, as in the typical form, as a simple fila- 

 ment, but unlike the condition in the type-form, this filament is very much 

 shorter than the cirrus. (Plate 55, fig. 8). The second branchiae consists also 

 each of a single filament which is very slender and much shorter than its cirrus, 

 although clearly exceeding the first in length. The fourth and succeeding 

 branchiae, to and including the fourteenth, consist each of two filaments which 

 seem in all cases to be exceeded by the notocirri. (Plate 55, fig. 9) . The branchiae 

 from the fifteenth are again simple and decrease in size caudad so much as to be 



