1911.] NATURAL SCIENCES OF PHILADELPHIA. 235 



branched and tufted gills form continuous rows of coarse filaments 

 behind the palisades of setae and occur in seven or eight pairs, of which 

 the lowermost, occupying the interramal space, and the uppermost 

 tend to split up. The middle cirrus is either opposite to the fourth 

 or fifth gill or opposite the interval between them. 



The setae are somewhat more slender than on the original specimens, 

 but agree with them in other respects. The dorsal ones project 

 conspicuously above the gills and more or less cover the median dorsal 

 area. 



This species has much in common with E. heterobranchia Johnson, 

 but lacks the smooth, cleft notopodial setae of that species. 



Stations 4,463, Monterey Bay, Point Pinos Lighthouse, 4S-111 

 fathoms, rocky; 4,552, same locality, 66-73 fathoms, green mud and 

 rocks. 



Euphrosyne dumosa sp. now PI. XV, figs. 12-17. 



A stout but little depressed species with conspicuous gills and 

 much of the aspect of an Arctian caterpillar. The type, having 

 34 segments, is 16 mm. long, with a maximum width, exclusive of the 

 setae, of 8 mm. and a maximum depth of about 4.8 mm., exclusive of 

 the gills and setae, and of 6 mm. including them. The cotype is 

 10 mm. long and 4 mm. wide with 32 segments. 



Prostomial caruncle long and narrow, the tip of the crest reaching 

 to or slightly beyond the furrow VI/VII, the base to the middle of VI 

 only; base and crest well-differentiated and separated by deep longi- 

 tudinal furrows; the crest smooth, not marked by distinct longitudinal 

 grooves, continued forward by a low ridge to the furrow separating 

 the palps. Eyes, two pairs; the dorsal immediately at the anterior 

 end of the caruncle on each side of the median tentacle, conspicuous, 

 black, round or slightly elongated; the ventral about one-half as 

 large, very close together between bases of peristomial parapodia. 

 Median tentacle situated at anterior end of caruncle, between dorsal 

 eyes and composed of a short cylindrical ceratophore about as long as 

 the basal width of the caruncle and a short style which is incomplete 

 in both specimens. Paired tentacles minute papillae immediately 

 ventral to ventral eyes. Palps smooth, flattened, ovate pads, sepa- 

 rated by a median fissure and continuous by their contracted anterior 

 ends with the peristomial parapodia. A low facial ridge runs forward 

 and downward to the fissure between the palpi. Mouth bounded by 

 palps in front, somite IV at the sides and the furrowed lip of V behind. 



Peristomium coalesced with prostomium and the anterior part 

 of the latter largely concealed between its forwardly directed para- 



