74 PHYLLODOGE. 



Body linear, rounded dorsally, and flattened ventrally — both surfaces being iridescent. 

 The ventral surface has a broad median groove which has a slightly monilif orm appearance 

 from the depressions at each segment- junction. The large dorsal cirri cover a con- 

 siderable portion of the lateral regions, notwithstanding the length of the feet 

 posteriorly. 



The dorsal division of the foot (Plate LXVIII, figs. 16 [10 th ] and 17 [40 th ] ) is short 

 anteriorly, but is considerably longer posteriorly. It bears a large irregularly reniform 

 cirrus, the hilus of which is situated nearer the lower than the upper border, and which, 

 as a transparent object, presents a radiated arrangement of its hypoderm from the 

 region of the hilus. These organs appear to be borne obliquely, and overlap each other 

 along the sides of the body. 



The tip of the inferior division presents an elongated and sharply conical process 

 superiorly, then a dimple, and a slightly receding margin inferiorly. The spine seems to 

 issue just beneath the conical process. The shafts of the bristles (Plate LXXVII, fig. 12) 

 have a slight curvature with a terminal dilatation, the distal edges of which have minute 

 spines, and they slope downward to a step from which the long, finely tapered, and 

 distinctly serrated blade springs. The proximal end of the latter is thus bevelled. The 

 inferior cirrus resembles the greater part of a lanceolate leaf, with an acute tip, but one 

 edge is attached. The tip is more acute in the posterior part of the body, as likewise is 

 the superior conical process. 



In the Arteritis peremptoria of Claparede, 1 from Naples, the ventral of the first pair of 

 tentacular cirri is very long, the dorsal and the succeeding pairs being shorter. 



Genus XXXLV.—Phyllodoce, Savigny (1820), Char, emend. 



Head elongated, often longer than broad, oval or egg-shaped, or cordate posteriorly. 

 One pair of circular eyes. Occasionally two rudimentary nuchal organs; four short 

 tentacles, four pairs of tentacular cirri, which Pruvot considers as modified dorsal cirri 

 of the ordinary kind, the first pair under the cephalic lobe, second and third on the 

 peristomial segment, fourth on the second segment (Malmgren). Body elongated, 

 flattened; segments two-ringed; dorsal cirri large, lamelliform, sometimes almost 

 rectangular, carried vertically; ventral cirrus much less, fixed to a horizontal pinna. 



Distinguished from Meone by the number of the tentacular cirri, from Eulalia by 

 the absence of the fifth tentacle, and from both by the form of the cirri and their 

 insertion (CErsted), whilst Anaitis is closely allied. 



Vascular system consists of two longitudinal vessels which communicate with each 

 other anteriorly, and which debouch into the posterior part of the body-cavity 

 (Gravier). 



Segmental organs.— A pair of ciliated tubes in each segment, the trumpet-shaped 

 atrial opening being on the anterior face of each dissepiment, the external aperture 

 on the ventral face at the base of the parapodium. Goodrich has recently described 



1 < Annel. Nap., Suppl./ p. 95, f. 6, 1870. 



