236 EUPHROSYNE FOLIOSA. 



lines and the characteristic furrows of the cuticle, occupies the centre, the sides beino* 

 flanked by the cirri and the dense rows of bristles and branchiae. Bach row has a 

 palisade of bristles towards the front of the segment, the cirrus (Plate XXXV, fig. 1) 

 standing freely a little behind, while the branchiae form a series of arbuscles— after an 

 interval — extending outwards from the latter. The second cirrus occurs in the position 

 formerly noted, and is generally longer than the other appendages. The anterior part 

 of the median groove is occupied by the caruncle, which stretches from the front to the 

 anterior part of the fifth segment, the tentacle springing between the dorsal pair of 

 eyes in the second segment. 1 J. V. Cams says his E. Audouinii (= E. laureata, D. Oh., 

 and E. racemosa, Ehlers) has a pair of tubercle-like antennae, seven branchial trunks, and 

 both bifurcate and smooth dorsal bristles. The ventral surface is marked in the British 

 examples by the presence of a slight median groove, and by the regularly arranged 

 segments. The first bristle-bearing segment lies on each side of the median fillet, and 

 ventrally forms a pad on each side of the middle line in front of the mouth; the second 

 and third slope obliquely inwards towards the first, whilst the halves of the fourth 

 are continuous behind the mouth, the outer ends being directed forward ; and a similar 

 inclination characterises the eight or nine which follow. The posterior segments, on 

 the other hand, have the outer regions sloped backwards. Two globular cirri terminate 

 the body posteriorly, the anus lying above them. 



The segments are much more distinctly marked than in Spinther, being readily 

 recognised dorsally by the palisades of bristles flanked by rows of branchiae, and ventrally 

 by the sulci between each. 



The feet are also fairly defined for a group in which the dorsal division forms 

 part of or becomes confluent with the dorsal arch of the body, and it is this structure 

 which, amongst other features, gives grounds for the classification followed in the 

 "Challenger" Annelida and in the present treatise. In each segment the innermost 

 structure is the cirrus, which is attached rather behind the middle of the segment, and 

 is a tapering organ of considerable length, with a filiform tip richly covered with cilia. 

 About the middle of the segment the palisade of bristles runs from the inner to the outer 

 border. The ordinary bristles have a well-marked spur with a slightly curved tip (Plate 

 XXXV, figs. 15 and 16). The serrated forms have a deeply cleft tip, both limbs being 

 curved, the longer doubly so when viewed laterally (Plate XXXV, f\g. 17). Milne 

 Edwards' figure of this bristle is quite diagnostic, though not absolutely correct. The 

 figure of the same kind of bristle given by Ehlers for E. myrtosa differs only in its 

 artistic treatment. Antero-posteriorly, again, this kind of bristle is straight (Plate 

 XXXV, fig. 18), The palisade of bristles just mentioned terminates at the dense tuft 

 of bifid bristles of the first-mentioned type (figs. 15 and 16) which projects from the foot 

 on each side. This tuft includes stout forms with comparatively short bifid tips, as well 

 as numerous slender forms with the tips almost in a line with the shaft and having 

 serrations on the edge of the tip (Plate XXXV, fig. 17); the short spur, moreover, has 

 a membranous guard from the tip to the side of the larger limb. The bristles in the 

 Hebridean example were remarkably developed all over. Schmarda found a golden 



1 Ehlers describes the caruncle of his E. racemosa as having an ovoid basal and a compressed 

 upper region. 



