236 PROCEEDINGS OF THE ACADEMY OF [April, 



type. Three small complete ones are from 52-93 mm. long and have 

 from 135 to 209 segments, and a larger one, lacking the caudal end, is 

 155 mm. long, 2 mm. wide and has 235 segments. 



Prostomium as long or slightly longer than wide, subovate, slightly 

 depressed, the ventral face with a slightly impressed median area 

 bounded by a pair of parallel furrows which pass into the mouth. 

 Eyes four in a transverse row near the posterior border. In the two 

 larger specimens the eyes are obscure, especially the outer larger pair; 

 on the smaller ones they are much more distinct and the middle always 

 decidedly smaller. Peristomium and succeeding achsetous segment 

 together about as long as the prostomium, the former slightly the 

 longer ; lip but little furrowed and palpal pads at base of prostomium 

 scarcely evident. 



Segments all simple and sharply defined, varying from four to six 

 times as wide as long, nearly terete, but the venter slightly flattened. 

 Lateral or parapodial furrow slightly developed. Pygidium a minute 

 cylinder bearing two or four very small padlike cirri. 



Parapodia (Pi. XX, figs. 143-145) begin on III. The anterior 

 are very small and inconspicuous, but they increase in size and become 

 prominent farther back. The body is slightly flattened, cylindroid, 

 constricted at the base and divided at the distal end by a vertical 

 setigerous cleft into presetal and postsetal lips. The former is short 

 and broadly rounded on all parapodia, the latter undergoes con- 

 spicuous change. On anterior parapodia (fig. 143) it is nearly as long- 

 as the body of the foot, moderately flattened and subtriangular, with 

 the blunt apex directed upward and outward. It rapidly becomes 

 longer, thicker and cylindroid and bends dorsad (fig. 144). Through- 

 out the middle region it presents the appearance of a short finger 

 crooked upward. Still farther back, continuing to increase in length 

 and arising more from the ventral aspect of the foot, it takes a slightly 

 spiral turn and a suberect posture and retains this character to the 

 caudal end (fig. 145). On all parapodia the notopodium appears as a 

 rather prominent but small angulated tubercle on the base of the dorsal 

 face of the neuropodium. 



Neuropodial acicula usually two or three, straight, tapered, pale, 

 with the dark, bluntly pointed tips protruding a short distance beyond 

 the surface. Notopodial acicula two or three slender fibers entering 

 the notopodial tubercle. 



Setae few, from six to eight on anterior, diminishing to usually four 

 on posterior parapodia. All are pale yellow, acute, bilimbate, more 

 or less sigmoidly curved and geniculate at the first bend. The genie- 



