Chamberlin — Polychaetes from Monterey Bay. 175 



posterior tentacular cirri the longest, but these reaching only to III. In 

 anterior parapodia the lobes are thick and notably rounded, particularly 

 those of the notopodia, the neuropodial subsetigerous lobe smaller than 

 the two notopodial lobes and more narrowed distad, less hemispherical. 

 In passing caudad the notopodial lobes become more elongate and more 

 conically pointed with notocirri still dorsal in position. In continuing 

 caudad the dorsal notopodial lobe becomes still more elongate and its 

 notocirrus shifts toward the tip, leaving beyond its base only a short, 

 finger-like process. The neuropodial lobe in the anterior parapodia is 

 very stout like the notopodial lobes; but in going caudad it becomes not- 

 ably reduced. Neurocirrus attached at base of neuropodium, where there 

 is a conspicuous transverse swelling, subulate, surpassing the neuropodial 

 lobe. Setae of usual general types. Anal cirri subulate, moderate, equal- 

 ling the last six or seven somites in length. 



Number of somites near 130. 



Length up to 140 mm.; greatest width, exclusive of parapodia, up to 

 7 mm. 



11. Nereis agassizi Ehlers. 



Die Borstenwiirmer, 1868, p. 542, pi. 23, f. 1. 



LEODICIDiE. 



12. Marphysa stylobranchiata Moore. 



Proc. acad. sci. Phil., 1909, p. 249, pi. 7, f . 8-12. 

 Many specimens. 



13. Leodice enteles, sp. nov. 



In this species the branchiae begin either on VIII, as most commonly, 

 or on IX as single terete filaments or sometimes as two, either on one side 

 only or on both. On the next segment two filaments, and on several suc- 

 ceeding ones three, the number increasing in going caudad to a maximum of 

 four, or five, counting the shorter continuation of the basal stalk. The fila- 

 ments are attached in one series along the stalk to which they are moderately 

 oblique. On XXXIV in the type the number of branches again reduced to 

 two, which number prevails also on the next four or five segments, after which 

 the branchiae are simple filaments, continuing as such to the end of the 

 body or obsolete on the four or five last pairs of parapodia. The tentacles 

 are all strongly moniliform with the proximal joints stoutest and narrowest, 

 the tentacles being constricted toward base, widening to end of proximal 

 third or so of length and then moderately narrowing distad, the last joint 

 well rounded; readily broken off at ends; cirratophores very short. A 

 median tentacle retaining seventeen articles reaches to somite VI. A 

 posterior paired tentacle retaining fifteen articles reaches to V. Pros- 

 tomium with a deep V-shaped median incision in anterior border. Palpi 

 thick, hemispherically rounded. Eye ectad of posterior paired tentacle 

 and caudad of anterior paired tentacle. Nuchal cirri shorter than peris- 



