NEREIS (PERINEREIS) MARIONII. 297 



lobe of the foot itself. In spirit-preparations these give a character to the region, as in 

 N. Dumerilii. 



The proboscis (Plate LX, fig. 9) has a pair of strong, curved maxillse with about 

 five or six serrations on the edge, a considerable portion of the tip being smooth. The 

 paragnathi are somewhat feebly developed, and apparently lose their brownish hue after 

 long preservation in spirit. Dorsally in front of the palpi (i.e., on the basal segment) are 

 two conspicuous papillae, each surmounted by a brown tooth (VI), and it may be one or two 

 smaller externally, transversely elongated at the base but pointed distally, and on the folds 

 between them are two or three smaller (V), though occasionally the solitary anterior one 

 is large. When the proboscis is half extruded these two papillae are very prominent, 

 and the edge of the proboscis at this stage of extrusion has thirteen crenations, each 

 furnished with minute paragnathi (VII and VIII). Those on the ventral surface are 

 arranged along two sides of a triangle, the apex being in the centre and toward the outer 

 border of the papilla. In some preparations this triangular area is tinted brownish and 

 thus sharply marked off from the proximal continuation of the fold, and from the distal 

 part of the fold forming the papilla in semi-extrusion. In the latter condition an inner 

 ring of six papillae occupies the centre, viz., two large lateral on each side, and a smaller 

 papilla dorsally and ventrally. 



The maxillary region presents dorsally a group of small teeth (II) on each side; 

 ventrally in the same region are rows of small paragnathi forming a somewhat 

 elongated area (IV) on each side, whilst between them is a considerable group of small 

 paragnathi (III). The figure made by the artist from a bleached specimen is somewhat 

 abnormal, for it shows two large paragnathi with two or three smaller internally (VI), 

 and only a single small posterior tooth in V, instead of the foregoing typical arrange- 

 ment. The variations of the paragnathi in this species are sufficiently evident by referring 

 to the figures of Ehlers, and more recently those of De St. Joseph as indicated in the 

 list. The foot in such a case is, perhaps, individually more diagnostic than the 

 paragnathi. 



The first foot (Plate LXXII, fig. 3) essentially differs from that of both Nereis 

 pelagica and N. cultrifera by the greater proportional bulk of the cirri. The dorsal edge 

 of the foot is short, and the short and massive dorsal cirrus extends considerably beyond 

 the dorsal lobe. The latter is large and bluntly ovate. The setigerous lobe beneath 

 (corresponding to the ventral setigerous lobe) is massive and projects much further than 

 in N. cultrifera, with which it agrees in being bifid. It bears dorsally a group of bristles 

 with slender tips of moderate length and finely spiked on the edge. The shafts have less 

 distinct transverse bars than in the former species. Beneath is a series of bristles with 

 short tips, the oblique part at the base being long, and curved near the prominent anterior 

 spur, whilst the spinous edge is curved and the tip scarcely hooked. The shafts show a 

 double camerated streak superiorly and a single one below the dilated region. The inferior 

 and larger group of bristles in this lobe corresponds in structure with the latter. The 

 spinous edges of all the bristles are directed upward in the preparation. Besides the 

 smaller upper and the larger inferior papilla of this lobe, the ventral edge presents a 

 distinct prominence. 



The ventral lobe does not project as far as the setigerous, and is elongate ovate in 



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