240 PROCEEDINGS OF THE ACADEMY OF [April, 



Tentacular cirri very much crowded, slightly flattened, very short, 

 the longest (dorsal of II) about four times length of prostomium and 

 reaching VII, the shortest (ventral of II) about twice prostomium, 

 the remaining two subequal and about two and one-half times prosto- 

 mium. Peristomium and II coalesced and scarcely visible from 

 above. There may be a minute nuchal tubercle, but this is uncertain. 

 Pygidium a minute ring bearing a pair of short, subulate cirri. 



Notocirrophores low and broad, styles rather thick and easily 

 detached, in this specimen carried nearly erect over the parapodia; 

 broadly foliaceous, nearly uniform in size and shape throughout, 

 triangular ovate, about three-fifths as wide as long with rounded 

 apex and oblique but not auriculate base, the markings arranged 

 bipinnately from a central axis. 



Neurocirri foliaceous, subquadrate elliptical, all free surfaces 

 evenly rounded, very broadly attached to venter of neuropodium 

 and carried posterior to the latter, scarcely reaching beyond end of 

 neuropodium. 



Aciculum single, stout, tapered, straight. Seta? in spreading, 

 vertical series, colorless, transparent, rather stout, with curved stems 

 rather abruptly enlarged distally, the margins of the socket bearing 

 a single series of rather long hairs. Appendages short, their length 

 not exceeding one-third depth of parapodia, very delicate, broad at 

 base but rapidly tapering to a tenuous tip; marginal serrations scarcely 

 visible. Six supra- and ten subacicular setse on middle parapodia. 



Color pale reddish-brown, brightest on notocirri and anterior 

 dorsum of body. Female with immature eggs. 



POLYNOID^]. 



Halosydna pulchra (Johnson). 



Polynoe pulchra Johnson, Proc. Cal. Acad. Sci. (3), Zoology, I (1897), pp. 

 177-179, PI. VII, figs. 34, 43a; PI. VIII, figs. 50-506. 



Three specimens occur in the collection, two certainly from the 

 Monterey Bay region, the other unlabeled but probably from the same 

 place. Of the first two one was commensal on the holothurian Sticho- 

 pus, the other on Cryptochiton. The latter is a fine specimen with 

 milk-white elytra marked with a small, round, clear-cut black spot 

 over the area of attachment. 



Halosydna brevisetosa Kinberg. 



Halosydna brevisetosa Kinberg, ' Of ver. K. Vetensk. Akad. Forh., XII 

 (1855), p. 385. 



Two small specimens were taken at San Diego, others in the vicinity 



