4 
SILURIAN 
two pairs of furrows nearly join at their base, which is not 
the case in the typical variety. The triangular lateral lobes, 
thus marked out, are themselves flattened, as much so as the 
glabella, and extend further out than the width of the great 
frontal lobe, reaching to the base of the eye-lobe itself. The 
free cheek (fig. 2 a) presents nothing peculiar, but seems 
to have had a very short spine, if any. The surface is 
smooth. 
Pleurae convex, smooth, with a broad and rather dee^) fur¬ 
row. The ends are blunt. 
The labrum (fig. 4) is of the usual shape for Asaphus , nar¬ 
rowed at the base of insertion, wide in the middle, and with 
broad lateral lobes, in this species rather blunt. The central 
space is convex, and the two lateral impressions very deep, each 
inclosing a tubercle. Fig. 5 shows an impression of the under 
side, and has the usual strong ridge encircling the central 
space. 
Caudal shield (fig. 9) rather wider than a semicircle, and 
nearly flat, but more convex towards the apex of the long 
axis, which reaches nearly to the margin, and is convex to¬ 
wards its end; it is annulated throughout by about nine ribs. 
The sides are marked by five or six furrows, of which the 
upper one only is lengthened. The rest stop halfway toward 
the edge, and abut against a broad smooth marginal belt, 
which occupies half the lateral spaces. 
Young specimens (fig\ 8) have the tail of the same shape 
and proportion as the older ones. 
Localities .—Chorhoti Pass. Damchen (figs. 8, 9). . Milam 
Glacier. (Numbers in Colonel Strachey's Catalogue of Locali¬ 
ties—Nos. 926, 1678, 1737, 1743, 1744, 1754, 1766.) 
2. ILiiENUS BRACHYONISCUS. 
Plate 1, fig. 12. 
The entire length could not have been two inches; there 
were at least eight, probably more, body rings, very narrow, 
