1911.] NATURAL SCIENCES OF PHILADELPHIA. 307 



Monterey Bay, 40-46 fathoms, dark green mud; 4,464, same locality, 

 36-51 fathoms, soft dark gray mud; 4,480, off Santa Cruz Lighthouse, 

 53-76 fathoms, dark green mud and sand. 



/ Cfiycinde armigera sp. nov. PI. XXI, tips. ico-lTl. 



A slender species with the two regions not sharply differentiated. 

 Length of t^-pe 81 mm., maximum width near middle, body only 

 1.8 mm., between tips of parapodia 3.1 mm. Number of segments 

 178. The largest example is IIS mm. long and has 191 segments. 



Prostomium (PI. XXI, fig. 160) much elongated, ecjual to the first 

 seven segments, very slender and acutely conical, depressed. Base 

 or oral region coalesced with peristomium, forming a somewhat swollen 

 region wider than second setigerous segment and divided by an indis- 

 tinct cross-furrow. Attenuated distal part divided very regularly 

 into sometimes eight, sometimes nine, equal wings, the apical one 

 bearing four small tentacles with clavate basal joints and minute 

 cylindrical retractile distal joints. Median dorsal and ventral fields 

 broad, smooth and continuous for entire length with the cross-furrows 

 shallow, the lateral fields bounded by deep dorsal and ventral grooves 

 and much more deeply cut by the interannular furrows. Mouth a 

 small crescentic slit within the enlarged basal region and bounded 

 laterally by the small palps. Eyes one pair, minute, black, widely 

 separated on basal region, frequently indiscerniljle on larger specimens; 

 no apical eyes. 



Peristomium united with base of prostomium, forming the simple 

 posterior lip and bearing a pair of small parapodia. Anterior end of 

 body very slender, at first narrower than the oral region of head, 

 terete; the segments well-defined, simj^le, slightly flattened below 

 and in the parapodial field, strongly arched above with a narrow, 

 somewhat softened dorsal field. The segments very gi'aduall}- increase 

 in })oth diameter and length to the point of greatest width (about LX), 

 where they are about three times as wide as long. The two regions 

 are less sharply differentiated than in many species, but a few segments 

 behind the point of greatest width of the anterior region a slight 

 constriction occurs, followed at somite LXX to LX.WT on different 

 specimens by a more or less obvious increase in size of the parapodia 

 accompanied by the presence, in mature examples, of genital products 

 in the ccclom. The neural eye-sjiots, which take the form of short 

 lorown — s crossing the intersegmental furrows in the neural line, 

 become conspicuous at the same place, but may be traced much farther 

 forward, often to about L, gradually becoming fainter. .Segments of 



