1909.] NATURAL SCIENCES OF PHILADELPHIA. 349 



Eulalia (Sige) bifoliata sp. nov. PI. XVI, figs. 31-34. 



Described from a single imperfect anterior end consisting of the 

 head and 57 segments, having a length of 18 mm. and a maximum 

 diameter between tips of parapodia of nearly 2 mm. Contracted and 

 rather stout, strongly arched above, flat below and little tapered in 

 the length of the piece. 



Prostomium (PL XVI, fig. 31) about three-fourths as long as wide, 

 somewhat depressed, subpyramidal with a straight, inclined profile, 

 greatest width in posterior half, posterior border nearly straight, 

 entire, bounded by a deep furrow separating the peristomium. No 

 anterior furrow behind tentacles. Eyes circular with prominent lenses, 

 brown, large, about one-fourth width of prostomium and situated at 

 its greatest width, about one-half their diameter anterior to posterior 

 border and close to lateral border. Frontal tentacles situated rather 

 close together at the truncated apex of prostomium, separated by 

 little more than one and one-half times their diameter, somewhat 

 macerated and imperfect, but their length approximately one-half 

 prostomium or slightly less. Median tentacle situated between 

 anterior border of e} r es at centre of prostomium, much smaller than 

 frontal tentacle, but macerated so that the exact size is not certain. 

 Immediately behind each eye is a faint brown spot. 



Peristomium scarcely visible above, forming a swollen lower lip 

 and small lobes beneath eyes. Remaining segments short, imiannulate. 

 Tentacular cirri with distinct cirrophores, all styles lost except the 

 ventral of II on one side, which is rather short and stout, conical, 

 about one and one-half times length of prostomium and reaching to 

 V. A small tuft of setae on II. 



Parapodia (PI. XVI, figs. 32, 33) small and little prominent, their 

 length about one-fourth width of somites on anterior and one-half 

 on posterior (middle) somites, but strongly compressed and deep. 

 Postsetal lip obsolete; presetal greatly developed and foliaceous, 

 divided by a deep acicular notch into a much smaller subacicular lobe, 

 rounded at the end, and a larger supra-acicular lobe prolonged into an 

 acuminate but blunt tip frequently much longer and more slender than 

 those figured. Neurocirrophores (figs. 32, 33) rounded swellings at 

 base of neuropodia; styles strongly foliaceous, thin, quadrant-shaped, 

 with the dorsal angle prolonged similarly to the supra-acicular lobe, 

 but usually extended far beyond the latter. Though of large size they 

 do not exceed the neuropodia of middle segments, the subsetal lobes 

 of which they completely cover from behind, reaching slightly dorsad 

 of the acicular notch, their nearly straight dorsal border being parallel 



