EI7LALIA VIRIDIS. 55 



outward on both sides in each papilla. The setigerous process is deeply bifid, the upper 

 limb being the larger. The pale bristles have a slightly bent shaft with an enlarged, 

 bevelled, and slightly bifid tip, which is more or less smooth, for articulating with the 

 terminal whip, which has a moderately elongate, flattened blade with a finely serrate 

 edge (Plate LXXVII, fig. 1). 



Attached somewhat behind the inferior border of the setigerous process is the ovate 

 acuminate inferior cirrus, the edge of which is rounded internally and pointed externally. 

 The hypodermic streaks run from the base outward to the free edge. The tip does not 

 extend so far outwards as that of the setigerous process. 



Reproduction. — In the posterior region of a large example in July, masses of eggs, 

 apparently ripe, occurred. When distended with ova, as in July and August, the body- 

 wall in section is very thin, the dorsal and ventral longitudinal muscles forming narrow 

 bands, and even the nerve-cords join in the general flattening. The wall of the 

 alimentary canal, however, remains of considerable thickness. 



The species is characteristic of the southern shores, and is soft and delicate. Slight 

 interference results in rupture and disintegration — especially in warm weather. Thus in 

 few examples is the tail furnished with cirri, and on the long, tapered region the feet 

 are very minute, leaving the terminal anus prominent. 



3. Bulalia viridis, 0. F. Midler, 1776. Plate XLIII, fig. 7, var. aurea ; Plate XLIV, 

 fig. 1; Plate XLIV, fig. 5, var. ornate; Plate LVIII, fig. 3— head ; Plate LXVII, 

 figs. 10 and 11— feet; Plate LXXVII, figs. 2 and 2 a— bristles. 



Specific Characters. — Head bluntly conical and pale throughout ; eyes two, black, 

 and occasionally an additional speck occurs external to each. Tentacles subulate, slightly 

 tapered. First pair of tentacular cirri somewhat lanceolate, tapered, and attached to the 

 first segment on each side ; the second and third are longer, and are attached to the 

 succeeding segment, whilst the fourth springs from the third segment. Body linear, one 

 to four inches long, slightly tapered anteriorly and more so posteriorly, and terminating 

 in two lanceolate caudal cirri. Colour of a rich deep green, or grass-green, paler in the 

 region of the proboscis, and dorsally each segment has two dark belts. Ventral surface 

 marked by a median moniliform line of dark olive, and posteriorly with a dark touch at 

 each foot. Proboscis with twenty-two or twenty-three papillae terminally in extrusion, 

 but a variety has only fourteen. 



Dorsal cirrus lanceolate with a tapering tip ; setigerous region short ; bristles in two 

 groups pale, the enlarged ends of the shafts minutely spinous, the terminal blade short, 

 rapidly tapered, and with bold serrations on the edge. 



Ventral cirrus ovate and slightly acuminate, projecting a little beyond the tip of the 

 setigerous lobe. 



Synonyms. 



1767. Nereis viridis, Linn. Syst. Nat., ed. 12, i, pt. 2, p. 1086. 

 1776. „ „ 0. F. Miiller. Zool. Danic. Prodr., Xo. 2636. 



