372 SCALISETOSTTS COMMUNIS. 



Anteriorly the pedicle for the scale is large, the ventral branch of the foot projecting 

 further than the dorsal as a soft process. Few bristles occurred in any of the feet. 

 The dorsal bristles (Plate XL, fig. 15) are short and stout, translucent, considerably 

 curved, with prominent yet somewhat close rows of spines, and an acute, smooth portion 

 at the tip. The ventral bristles (Plate XL, fig. 16) are translucent and extremely 

 slender both as regards shaft and tip, the latter being long and tapering to the bare 

 region at the point, which is simple, and in some is slightly bent. The spinous rows are 

 distinct, but somewhat close. 



So far as ascertained, no form approaches this species. 



Genus XVII. — Soalisetosus, Mcintosh, 1885. 



Anterior border of the head smoothly rounded. Eyes placed close together on each 

 side, while the right and left pairs are widely separated and placed far back. Palpi 

 smooth. Proboscis somewhat thin. Body of moderate length. Scales cover the dorsum 

 in front, but leave the centre bare posteriorly. Segmental eminence distinct, but the 

 papilla is small. Bristles transparent as crystal ; dorsal slightly curved, and with 5 — 8 

 very distinct rows of spines. Ventral bristles slender, elongate, with close spinous rows, 

 and hooked and bifid tip. Longitudinal ventral muscles present a well-marked convexity 

 in section. The ventral area is of considerable width, nerve-cords flattened and indefi- 

 nite. Cuticle and subjacent granular layer attenuate. A strong band of fibres connects 

 the insertions of the powerful oblique muscles, and thus bounds the cords internally. 



Professor Griard 1 gave an amended description of Kinberg's genus Hermadion to suit 

 the present forms, but the name Scalisetosus had already been published. It is perhaps 

 well to remove them altogether from Kinberg's genus. 



1. Soalisetosus communis, Belle Chiaje, 1841. Plate XXVI, fig. 6. 



Specific Characters.— Head touched with yellowish or whitish pigment, anterior lobes 

 smoothly rounded ; eyes of each side placed close together, while the right and left pairs 

 are widely separated and placed far back ; anterior pair larger, and wider apart. Median 

 tentacle long, slightly dilated below the filiform extremity, and with rather numerous 

 short clavate cilia. Lateral tentacles long, with filamentous tips, and similarly coated with 

 cilia. Palpi smooth. Tentacular cirri resemble the tentacles. Body \ to | inch long ; seg- 

 ments twenty-two to forty-two. Colour pale yellowish, faintly marked with brown 

 towards the posterior end— especially between the feet ; or speckled with brownish 

 spots arranged transversely, and numerous yellowish or whitish specks. Occasionally the 

 dorsum is blackish, interrupted by numerous transverse lines. The ventral surface is 

 pale. Segmental eminence prominent, but papilla minute. Scales fifteen pairs, 

 rounded or ovate, minutely dotted on the ventral surface, outer and posterior portions 



i ( 



Bullet, scient./ No. 1, 1886, p. 7. 



