78 PHYLLODOOE LAMELLIGERA. 



zone as Benham 1 seems to think, though it is long since Prof. Jameson received from 

 Mr. Neill examples dredged on oyster-shells in the Forth. 



Stretches to the Adriatic (Quarnero) — Ehlers ; shores of France (And. and Ed., 

 De St. Joseph, etc.). Moluccas (Ternate) — Fischli. 



Head somewhat cordate, with the large eyes placed near its middle, and of a pinkish 

 iridescent aspect, the ground colour being olive green, with a dark touch in front. 

 Tentacles subulate. Tentacular cirri with a ringed ceratophore. Both appendages have 

 the same dull greenish hue as the dorsal cirri. At the posterior and outer angle of the 

 head, and just in front of the upper tentacular cirri, is a considerable papilla — probably 

 sensory. A minute papilla also occurs in the centre of the posterior sinus of the head. 

 The two longer tentacular cirri are often borne straight backward and adpressed to the 

 smooth dorsum between the lamellse. 



Body linear, much elongated, from 14 to 18 inches or even 2 feet (Johnston and 

 Dalyell), and with more than 400 segments. Convex dorsally, flattened ventrally, tapered 

 a little anteriorly and more distinctly so posteriorly where it ends in two rather stout 

 caudal cirri. The dorsum is of a fine iridescent bluish hue marked by regularly arranged 

 transverse furrows. Each segment in the middle of the body has a narrow belt in front, 

 succeeded by three others gradually extending in a transverse direction, a fifth twice as 

 deep, and then a part not definitely bounded except by the segment-junction. In the 

 middle line of the dorsum is a series of blackish specks, which, with the dark lamella on 

 each side, make three in each segment. A conspicuous dark belt also occurs-on the upper 

 and anterior edge of the pedicle of the foot. The ventral surface is likewise iridescent, 

 but the bluish sheen is less developed. In life and in certain lights in the preparations 

 three rows of spots are visible on this surface, the central consisting of a pale speck in 

 the interrupted median band. The dusky pigment is arranged in transverse bands as on 

 the dorsum. The remarkable iridescence of the cuticle of this species is conspicuous in 

 softened preparations. 



In general the colour of the dorsum varies considerably, perhaps according to 

 habitat, those most exposed to sunlight being most deeply tinted. In one fully two feet 

 long, which was procured under a large stone about half tide mark, the bluish sheen of 

 the dorsum is most marked in front, yet it does not conceal the two dark bars which cross 

 the segment between the feet and the median dark patches which lie in front and behind 

 them. The segments, moreover, are ringed. Posteriorly the hue is olive with a tinge of 

 russet, and the dark pigment on the dorsum is arranged in two lateral touches and 

 a median a little behind them. A trace of the bluish sheen is noticeable even to the tip 

 of the tail. The general hue of the body is thus darker in front, paler (olive) posteriorly. 

 In the same way the olive green pigment of the cirri is darker in the anterior, paler in the 

 posterior region, the margin of the dorsal cirri being paler. The under surface is pale 

 with a tinge of iridescent pink. 



The proboscis in extrusion forms a long, dark clavate organ, the basal section being 

 covered with small papilla (Plate LVIII, fig. 20). The wall of the organ beneath the 

 basement-membrane is marked by intersecting fibres. The distal region has numerous 

 low transverse papillas which are not so distinctly arranged in a hexagonal form as in 



1 ' Camb. Nat. Hist./ ii, p. 314. 



