54 EULALIA NEBULOSA. 



Habitat. — Abundant at St. Peter Port, Guernsey, and at Herm, under stones between 

 tide-marks amongst muddy gravel, and occasionally in mud under dead limpet- shells. 

 Col. Montagu dredged specimens about four inches long at Torcross in 1813. Plymouth 

 (Allen). Mediterranean (Grube). 



Head (Plate LVIII, figs. 1 and 2) broadly conical; the median tentacle springing 

 from the surface a little in front of the eyes, which are two, large, blackish-brown. 

 Tentacles pale, with a dark speck at the base of the median, one at the base of the posterior 

 pair near the eyes, and another at the enlarged part of the latter pair. The tentacles and 

 cirri generally are of moderate length and somewhat thick. In many preserved specimens 

 a dark brown speck of pigment remains on each side just in front of the median tentacle. 



Body five to ten inches long, somewhat soft in texture, tapered considerably anteriorly 

 but much more so posteriorly, where it ends in a long slender tail, having two small 

 cirri at the tip, which, however, are rarely seen. It is of a dull yellowish or pinkish hue 

 minutely speckled on the dorsum with dark green touches, which are symmetrically 

 arranged — a long lozenge occurring in the middle line in front, and a bar behind — 

 stretching between the feet of opposite sides. Montagu's figure shows one row of six 

 spots at the segment-junction, and another series of four on the space behind. Sometimes 

 the hue of the dorsum is less pale orange and more of a dull yellowish tint. The ventral 

 surface is pale. After preservation in spirit a narrow transverse bar (dorsally and 

 ventrally) characterizes each segment-junction. It is wider in the middle and tapers off 

 at each margin. 



In the coloured figure (which I owe to the courtesy of Dr. Allen of the Plymouth 

 Marine Laboratory) each segment is marked by a transverse row of brownish clots, the 

 outer on each side being the larger, and behind is a row of smaller dots. 



The proboscis (Plate LVIII, f[g. 2) is remarkable for its great length, narrow cylin- 

 drical form, and dense series of minute papilla?, so that its surface is rasp-like. In some the 

 entire alimentary apparatus seems to be ejected (in spirit) through a rupture of the 

 body-wall. The fixed end of the proboscis is firm and muscular, and is succeeded by a 

 short glandular region with thinner walls ; then the firm proboscis increases in diameter 

 to its junction with the alimentary canal proper, a well-marked constriction occurring at 

 this point. The first part of the region is firm, but it soon becomes thin and glandular. 

 The specimens are somewhat softened. 



The contents of the alimentary canal were sandy mud containing foraminifers, 

 masses of debris of Neplithys with bristles, bristles of other annelids, and sponge-spicules. 



The typical foot (Plate LXVII, figs. 8 and 9) presents dorsally a large and somewhat 

 cordate cirrus, the colouration of which is subject to some variation. Thus many have a 

 dull green border dorsally, whereas in those from Herm the centre of the lamella had a 

 dark V-shaped mark, with one or two rows of dark specks above it. The lamella? 

 spring from a prominent peduncle (ceratophore), which in the preserved specimens forms 

 a feature of the dorsum — especially as in many they are devoid of lamella?. The lamella? 

 vary a little in shape at the base, from the nature of the supporting peduncle, the anterior 

 (at the tenth foot) presenting a truly cordate base, whereas at the ninetieth foot the broad 

 base is nearly flat. The hypodermic tissue is arranged in a fan-like manner from the base 



