1909.] NATURAL SCIENCES OF PHILADELPHIA. 345 



posterior lip. Tentacular cirri much crowded, the peristomial and 



that of III (notocirrus) arising almost between the dorsal and ventral 

 cirri of II. the former at the higher level. All have short but distinct 

 eeratophores and prominent, regularly acuminate styles with slender 

 tips. They are slightly flattened in the type, much more strongly 

 flattened, apparently as a result of accidental pressure, in the cotype. 

 The longest (dorsal of II 1 reaches to XII. those of I and III reach to 

 IX and the ventral of II to VI. A conspicuous tuft of neuropodial 

 seta* occurs between the two cirri of II. 



Setigerous segments sharply defined by deep furrows : very short 

 anteriorly but increasing until in the middle region they are at least 

 one-third as long as wide. Slightly depressed and little more convex 

 above than below. Behind the middle they gradually diminish in 

 size to the pygidium, which is a very short and small ring, the cirri oi 

 which have been lost. 



Parapodia rather short, scarcely exceeding one-third width of their 

 -egments but with conspicuous spreading tufts of seta> which begin on 

 II. Neuropodia (PI. XVI. fig. 24) strongly compressed, subovate; 

 postsetal lip rudimentary: presetal lip well developed, foliaceous. 

 symmetrical, terminating in a blunt point but altogether lacking 

 notch. though there is a slight posterior groove in which the end of 

 the aciculum rests (,fig. 25). Xeurocirri (fig. 24) rather thick, very 

 large, especially anteriorly where they have an area of about four times 

 theneuropodium. but diminishing to twice the neuropodium posteriorly. 

 They are narrowly palette-shaped, the excavated portion attached to 

 low cirrophores on the ventral base of the neuropodia. the broad end 

 outward and bent dorsad behind and extending far beyond the neuro- 

 podia, which they completely conceal from behind and serve the pur- 

 pose of postsetal lobes. They are crowded with deep-brown or on the 

 margins often nearly black glands. NTotocirrophores (fig. 24) large 

 and prominent, erect, more or less dome-like with a restricted area for 

 attachment of the styles. Styles thin and membranous, easily 

 detached, somewhat imbricated and concealing the parapodia; anter- 

 iorly ovate with rounded ends, on middle segments broadly ovate- 

 euneate with pointed ends and posteriorly becoming elongated: the 

 base oblique and asymmetrical with a shallow sinus for attachment. 

 Internal structure finelv reticular with slightly developed veins and 

 glands. 



Aciculum single, colorless, tapered, ending in a rather acute point. 

 Seta 3 forming a very broad undivided, fan-shaped fascicle, very numer- 

 ous for the genus (30 on X. 4$ on XXV. 40 on I. and 36 on LXXV 



