60 EITLALIA (PTEROCIRRITS) MACROCEROS. 



distinction in the buccal segment, in the structure of the feet, or other characters, to 

 warrant specific separation. The colouration, as described by De St. Joseph, is certainly 

 striking, consisting of a brownish ground colour, with two parallel greenish bands on each 

 side of a central spot in each segment. The ventral surface is slightly violet. 



The form with fourteen papillse on the proboscis is that found at Dinard by De 

 St. Joseph (1888), who considered the following as varieties, viz., Phyllodoce clavigera 

 (Aud. & Ed.), Eulalia viridis ((Erst.), P. viridis (Johnston), E. vixens (Ehlers), and E. 

 guttata (Claparede) . 



Hornel (1891) thought the green colour was not protective. 



Gravier 1 shows a strong transverse band of muscle passing from side to side 

 below the gut and above the nerve-cords in this form. Between it and the outer portion 

 of the oblique muscle above it, lies the segmental organ, the internal ciliated funnel 

 and the external opening of which (just within the base of the ventral cirrus) are 

 also figured. 



A closely allied form is Eulalia aurea (Gravier), 2 which is of a bright golden hue, 

 with a violet band along the middle line of the dorsum, and a dark line on each side, or 

 rather a kind of arch in each segment, this alone being continued in front. The eyes 

 are large and circular; the paired tentacles short, the median longer, and inserted in 

 front of the eyes. The first segment bears a pair of tentacular cirri ; the second two 

 pairs, with a minute bundle of bristles between. The dorsal (tentacular) cirrus extends to 

 the twelfth segment. The third segment bears the fourth pair of tentacular cirri, accom- 

 panied by a bundle of bristles and a minute ventral cirrus. The dorsal cirri are elongate, 

 with a blunt point. The ventral cirri are a little less, and relatively large. Anal cirri 

 are foliaceous, and double the length of the dorsal cirri of the region. The bristles have 

 a hook at the end of the shaft which is covered with minute spines. The terminal 

 blade is very short, and shows oblique striation. Proboscis is entirely covered with 

 minute papillse. The end has a ring of twenty papillse. 



It belongs to the type of E. viridis, with elongate, lancet-like, dorsal cirri. Gravier 

 says it is distinguished by its colouration, by the remarkable length of the proboscis, by 

 its dorsal cirri being less acuminate, and also by its bristles — the terminal piece of which 

 is short. It has not been thought necessary to separate this form from E. viridis. 



4. Eulalia (Pterocierus) macroceros, Grube, 1860. Plate LVIII, fio-. 4 head ■ Plate 



LXVII, fig. 12— foot; Plate LXXVII, fig. 3— bristle. 



Specific Characters. — Head rather large and long, with two large circular black eyes, 

 in front of which arises the large, subulate, and long median tentacle. Occasionally a 

 dark line occurs behind each. The other tentacles are also comparatively large and long. 

 The first pair of tentacular cirri is normal, but somewhat short. The dorsal of the 

 second pair is of considerable length, whilst the ventral forms a long, lanceolate, and 



1 'Bull. Sc. Fr. Belg./ t. xxix, pi. xxii, fig. 3. 

 3 Op. cit., t. xxix, 1896, p. 309, pi. xvi, fig. 2—6. 



