TRILOBITES. 
9 
and widely separated by an arched intervening space, will not 
allow us to arrange our species in any other genus. 
The tail-piece (which can belong to no other) is trans¬ 
verse,, formed of at least four rounded subtruncate lobes, of 
which, as we see the inner or under surface only, it is need¬ 
less to give any further description. The size corresponds 
nearly with that of the glabella figured above it, and it is 
clearly different from the corresponding portion in Cheirurus 
mitis. 
Locality.—{ Head) above Bompras. (Caudal shield, fig. 22) 
Chorhoti Pass. Nos. 1663, head ; 1737, tail.) 
7. LICHAS TIBETANUS. 
Plate 1, fig. 23. 
L. glabella asp e r o -tub e r cul at a, sub-pentagona, e tribus lobis mag- 
nis composita ; lobo centrali oblongo lineari, per medium contracto, ad 
basin paullo latiori, antice expanso, lateralibus ovato-oblongis, supra 
latioribus, usque ad basin glabella; attingentibus ; lobis basalibus nullis. 
Glabella roughly pentagonal, as long as wide, with three 
large lobes, of which the central is linear-oblong for two-thirds 
of its length. It expands above into a rounded forehead lobe, 
not more convex than the rest of the head. The side lobes are 
ovate-oblong, rather broadest above, and reaching the very base 
of the glabella, without any basal lobes between them and the 
neck border. The rest of the head, body, &c., is unknown. 
Surface rather roughly tubercular. 
The specimen reminds us of several European species, but 
does not quite agree with any. The basal lobes reach com¬ 
pletely to the base in such species as Lidias Hibernicus of Port- 
lock, a convex form in the English Lower Silurian. 
Locality. —Damchen. Chorhoti Pass, above Bompras. 
(Nos. 1662, tail; 1678, head; 1737.) 
VOL. II. 
C 
