LYSIDICE PUNCTATA. 459 



The first foot lias a short dorsal cirrus somewhat tapered distally, a slight setigerous 

 lobe bearing both simple and compound bristles, and a short ovate ventral cirrus. In the 

 upper tuft of simple bristles are a few brush -shaped forms. The foot has a single spine. 



At the tenth foot (Plate LXXV, fig. 4) the dorsal cirrus is longer, forming a tapering 

 process slightly constricted at the base. It does not extend in spirit beyond the tips of 

 the bristles. The setigerous process has greatly increased in size, forming a broad (or 

 deep) flattened cone with two strong yellowish spines. The simple winged dorsal bristles 

 (Plate LXXXIV, fig. 2) are curved at the commencement of the tip, which is somewhat 

 dilated, and then tapers rather quickly to a fine point. The edges of the wings are finely 

 serrate. These bristles issue above the spines. 



Beneath the spines is a dense group of the jointed bristles (Plate LXXXIV, fig. 2 a), 

 the shafts being enlarged and curved toward the end, and serrated along the convex edge. 

 When the bristle is seen from the front only one of the convex edges is distinctly spinous, 

 the other being faintly so, but this may be due to position. The terminal piece is 

 comparatively short, has spinous wings, a double tip from a lateral hook, and a 

 terminal spur. 



At the thirtieth foot (Plate LXXXIV, fig. 4 a) a single spine supports the setigerous 

 region, its point projecting beyond the edge. A strong hook, however, passes obliquely 

 downward and pierces the skin below the compound bristles, which are somewhat larger 

 than in the tenth foot. The hook (Plate LXXXIV, fig. 2 a) has a double wing at the tip, 

 which is bifid. 



The structure of the simple and especially the compound bristles is more satisfactorily 

 made out in the fiftieth foot (Plate LXXV, fig. 4), the latter kind being considerably 

 larger than in the tenth foot. A single strong spine is present, and the powerful hook 

 (Plate LXXXIV, fig. 9) occupies the position indicated in the thirtieth foot. 



In the posterior feet, viz., those in front of the tail, the dorsal cirrus becomes shorter, 

 projecting outward little beyond the tip of the setigerous region, which forms a broad 

 short cone, with the spine piercing the apex. The dorsal bristles are fewer and shorter, 

 but their serrations are very distinct. The compound bristles are also shorter and fewer, 

 and the serrations on the enlarged ends of the shafts are somewhat indistinct. The 

 ventral hook has the same oblique position, its brownish shaft crossing that of the spine. 

 The ventral cirrus is very short, bluntly conical, and does not reach a vertical line from 

 the apex of the setigerous region. 



In some the spine towards the tip of the tail is dark brown. Occasionally two 

 occur, similarly coloured. A developing hook, again, is pale. 



Reproduction. — In the beginning of April the females from Jersey carried ova — far 

 advanced. Lo Bianco 1 gives November as the month in which he found this species ripe 

 at Naples. 



The young form has two pairs of eyes but only a median tentacle. By-and-by the 

 paired tentacles develop and the two anterior eyes disappear. 2 



The Nereis cristatella of Montagu (MS. drawings, Linn. Soc, Plate XXXVI, fig. 3, 

 1808) appears to be this species. 



1 ' Mitth. Zool. Stat. Neap./ xiii, p. 487. 



2 Gravier, 1900. 



