244 THE ANNELIDA POLYCHAETA. 



This species seems to be rather widely separated from the other Pacific 

 forms in the character and arrangement of the brancliiae, e.g., in having the 

 branchiae either simple or at most with two filaments, with the first one appear- 

 ing far back (somites XVII-XVIII) and the series terminating near the middle 

 of the length. Among the Pacific forms the species suggests L. paupera (Grube) 

 in the weak development of the branchiae. In the latter species, however, the 

 branchiae begin on the twenty fifth somite (twenty third parapodial), are in 

 part three-branched, and extend nearly to the caudal end of the body. In that 

 form there are in each parapodium from the twenty fifth caudad two acicula 

 and two crochets instead of one of each, the teeth of maxillae II and III are fewer, 

 and the somites are fewer, — one hundred and twenty-seven as against two hun- 

 dred and forty-two. 



Leodice oliga, sp. nov.^ 

 Plate 55, fig. 11; Plate 56, fig. 2-9. 



Body in general duU brown, without markings; the tentacles lighter, 

 somewhat yellowish; the cirri and branchiae but httle lighter than body, of 

 greyish cast. 



The body is first slightly narrowed anteriorly, but it narrows moderately 

 caudad from the region of about the fifteenth somite. It is unusually short, 

 the total length of the type being nearly 16.5 mm. and the greatest width, exclu- 

 sive of the parapodia, 2 nam. The total number of somites is eighty-two. 



Prostomium divided in front by a moderately deep and narrow vertical 

 median incision; each lobe subpyriform, with the enlarged end ectoventrad in 

 position, with on its anterior surface a curved, sublongitudinal furrow nearer 

 outer side and with ends curved mesad. The median or inner paired tentacles 

 are in contact with the peristomium; each outer paired tentacle is inserted close 

 to the base of the corresponding inner one, in front and but little ectad. The 

 tentacles are all distinctly jointed, the articles short and rounded and the ten- 

 tacles in distal portion submoniliform. The median tentacle reaches to somite 

 XVI; it narrows from the base distad to the slender distal portion and con- 

 sists of twenty-nine or thirty articles. Each inner paired tentacle is in form hke 

 the median but is much shorter, extending to the ninth somite and consisting of 

 nearly twenty articles. Each outer paired tentacle is very short, reaching only 



' oXLyoi, short, little. 



