90 PHYLLODOCE MACULATA. 



Habitat. — Not uncommon amongst the rocks between tide-marks at St. Andrews, 

 under stones (E. M.), and at Lochmaddy dredged on the surface of sandy mud amongst 

 alga3 in the laminarian region. Also in sand near low water-mark, St. Andrews. 

 Iceland (Malmgren). Faroe (Willemoes-Suhm). 



Head longer than broad, 1 pale, speckled with yellow, cordate posteriorly. Eyes two, of 

 moderate size. Tentacles subulate with finely tapered tips. Tentacular cirri normal. Imme- 

 diately behind the eyes (apparently on the first segment) are three bright yellow spots, a 

 central and two anterior. In some the tentacular cirri have a dark spot a little below the tip. 

 Body from 3 to 4 inches in length, linear, tapering gently anteriorly, with three rows 

 of dark spots, the central being most conspicuous. Posteriorly a yellowish- white spot 

 appears between the dark, central ones. Many have a narrow yellowish bar between each 

 of the brown bars, and as the centre is somewhat imperfect, it has thus the aspect of two 

 specks. The lateral brown spots are due to the dorsal lamellse. In some the body is of 

 a deep greenish hue on the dorsum with a median dark stripe and a dumb-bell shaped 

 transverse bar (Plate XLVII, fig. 3). Such may be due to the development of ova in 

 March. A dark variety in which the colours are beautifully marked is common amongst 

 the tangles in Bressay Sound and on a sandy bottom in Vatsland Bight. The under 

 surface is pale. The body tapers posteriorly and ends in two lanceolate cirri. 



The proboscis in extrusion (Plate LVIII, fig. 21) presents proximally two groups of 

 six rows of papillas, which are fewer (about ten in each row) than in P. groenlandica. The 

 distal region has a somewhat hexagonal outline in section from the six rows of large 

 tubercles or folds. The aperture presents the same fluted condition as in the former 

 species, with about sixteen papillas. 



When the alimentary canal has been largely distended before section, the cells, 

 especially dorsal, arrange themselves in two series, the outer with large granular nuclei 

 which stain deeply. 



The muscular system of this species conforms to the type, though the scale is smaller. 

 The muscular fasciculi are similarly arranged in the dorsal and ventral longitudinal 

 muscles. The oblique muscles pass below the proportionally large nerve-cords to the 

 basement-membrane, which — with the hypoderm and cuticle — are external. A considerable 

 area of granular tissue lies between the cords ventrally. 



The dorsal division of the foot (Plate LXVIII, figs. 7 [tenth] and 8 [sixtieth]) bears 

 a cirrus which is irregularly ovate, the dorsal edge being rounded, so that irrespective of 

 size it differs from the typical lamella of P. groenlandica. In the anterior region the 

 lamella has the form of a conical or ovate-acuminate leaf, and posteriorly a similar outline 

 is assumed. In the intermediate region it is sub-rectangular. The bases of these lamella? 

 are ciliated, and stalked Infusoria are common on them. 



The inferior division consists of a rather short bifid spinigerous lobe with the bristles 

 (Plate LXXVII, fig. 23) which have slightly curved shafts with dilated tips finely 

 serrated. The dilated region of such a bristle is grooved so as to guard the origin of the 

 tapering terminal blade, which is of moderate length and minutely serrated. The ventral 

 cirrus is broadly lanceolate, the pointed tip projecting beyond the setigerous lobe. 



The dorsal cirri have very little of the greenish pigment anteriorly, so that they are 

 1 Malmgren ; s "latitudine longitudinem superans/' referring to spirit preparations. 



