236 PROCEEDINGS OF THE ACADEMY OF [April, 



SYLLID^3. 



Syllis elongata Johnson. 



Pionosyllis elongata (Johnson), Proc. Bos. Soc. Nat. Hist., XXIX, pp. 

 403-405; PI. 6, figs. 67-70; PL 7, fig. 71. 



Dredged at Delmonte wharf, vicinity of Monterey Bay, July 12, 1904. 



A fine specimen 40 mm. long, with 193 segments, the last 28 or 29 

 of which are much distended with sperm and elongated to three times 

 the length of the preceding 29 segments. The notocirri are more 

 tapered and acute than represented in Johnson's figure. This species 

 is very slender and in general aspect closely resembles Syllis gracilis 

 Grube. At least the dorsalmost seta of many of the middle segments 

 has the appendage coalesced with the stem to form bifurcate setae 

 as in that species. Probably it should be placed in VerriU's subgenus 

 Synsyllis. It certainly departs widely from the type of Pionosyllis 

 in the form of its setae and its strongly moniliform tentacles and cirri. 

 The posterior region is so much enlarged that it seems probable that it 

 separates at maturity. 



Tr ypanosyllis intermedia sp. nov. (Plate VII, figs. 1 and 2). 



An imperfectly known species resembling T. gemmi'para Johnson 

 in general aspect, but readily distinguished from that species by the 

 much longer appendages of its setae. 



Length of the anterior 80 segments of an incomplete specimen, 18 

 mm. ; maximum width between tips of parapodia, 2 mm. 



Prostomium quadrate, silghtly wider than long, with a median dorsal 

 furrow. Eyes small, red, dorso-lateral ; the anterior slightly farther 

 apart and less than one-eighth the width of the prostomium ; the pos- 

 terior pair about one-twelfth the width of the prostomium and separ- 

 ated from the anterior by an equal distance. Palpi about as long as 

 prostomium, projecting forward and widely divergent. Tentacles 

 all missing. 



Anterior end of body broad and strongly depressed, becoming 

 gradually less so posteriorly. Segments all extremely short and 

 crowded, especially anteriorly, where they are slightly biannulate. 

 Pygidium unknown. 



Parapodia uniramous, short, stout and slightly notched distally. 

 Neurocirri short, cylindrical, rounded distally, and arising from middle 

 of ventral face of neuropodia, the end of which they scarcely reach. 

 Notocirri arising from prominent cirrophores immediately above 

 the base of the neuropodia; styles very readily detached and only a 

 few remaining so that their relative length is unknown, those remain- 

 ing rather stout, swollen beyond base and thence tapered to the blunt 



