LAGISCA EXTENUATA. 309 



Scales (Plate XXXII, fig. 8) somewhat thin, in number fifteen pairs. They are 

 rounded in front, reniform or irregularly rounded posteriorly, and of a uniform greyish 

 hue in the preparations, though some are quite pale. Their surface is nearly smooth to the 

 naked eye, but under a lens the whole is densely covered by a series of minute, pointed, 

 slightly brownish spines, and the free portion of the edge is profusely ciliated (Eig. 24), 

 the cilia being pellucid, tapering structures terminating in a bulbous tip. Marenzeller 

 speaks of the network formed on the surface by the pigment; and Hornell mentions that 

 the surface is mapped out into separate areas, each containing several spines. The 

 under surface is iridescent, and the scar for attachment is situated near the outer and 

 anterior border. Marenzeller shows, besides the spines on the edge of the scale, 

 cylindrical papillas, but these have not been observed in our specimens. The first scale 

 is ciliated all round with the exception of the short covered portion. 



De St. Joseph often found a white touch in the centre of the scales, which were 

 marked with brown, grey, and whitish. Hornell's figure of the scale differs from the 

 specimens referred to here. 



Feet. — The base of first foot shows about two bristles, which conform to the type of 

 dorsal tuft, though they are considerably smaller. In the next foot the dorsal bristles 

 have attained great strength, though they are shorter than the typical forms, and much 

 broader towards the tip, which is little tapered. The bristle is therefore proportionally 

 more powerful than the typical form. They have a close series of spinous rows. The 

 contrast between the massive dorsal and the slender ventral bristles is marked, and the 

 tips of the longest of the latter extend only a very little beyond the extremities of the 

 dorsal. Their tips seem to be brittle, and while the inferior are more elongated and 

 slender, the upper forms present the characteristic short broad tips of the typical bristles. 



In the third foot the size of the ventral bristles has largely increased, and they 

 stand out nearly half their length beyond the dorsal. The tips now approach the 

 normal, except that those of the inferior series are longer, and the upper slightly shorter. 



In the typical foot (Plate XLII, fig. 30) the dorsal bristles form a powerful fan, the 

 inner and outer borders of which have more slender forms, while the greater number 

 consist of strong, slightly curved and tapered bristles, with somewhat closely arranged 

 spinous rows, and a smooth spear-shaped tip (Plate XXXVIII, fig. 10), the latter having 

 a tendency in some to follow the shape of the same region in the ventral bristles 

 (Plate XXXVIII, fig. 11). Others, again, show a sharper tip, and at the inner border 

 of the tuft are one or two with a slender tip. The ventral division commences with 

 a series having very long spinous regions, and a short and characteristically shaped bare 

 tip (Plate XXXVIII, fig. 12). The rows of spines are much finer and more dense than 

 in Harmothoe imbri cat a— indeed, in this respect they approach Acanthicolepis asperrima. 

 Those following the upper series show a distinct secondary process beneath the tips 

 (Plate XXXVIII, fig. 13). The length of the spinous tips diminishes in the usual manner 

 towards the ventral edge of the foot, the bare portion at the tip in several of the lowest 

 showing no secondary process. The papilla above the spine is long and filiform, and the 

 ventral cirrus extends beyond the bases of the adjoining bristles, and has sparsely 

 distributed and short clavate cilia. All the bristles are of a pale yellowish hue. 



Posteriorly the dorsal division diminishes in length, and disappears in some of the 



