Till LOB 1TES. 
7 
The small caudal shield (fig. 18) has the central lobe con¬ 
vex, but not very markedly separate from the side lobes. It 
is pyramidal, four-ringed, and runs out between the two ter¬ 
minal lobes. There are four lobes on each side; all are 
equally blunt and tumid (almost tubercular). The number 
of these is ten (four lateral on each side, and two terminal), 
and this number is quite unusual in the genus. 
The small labrum (fig. 17) which occurs in plenty with the 
species, has the usual characters ; a blunt termination, convex 
surface, and obscure concentric furrows. 
Localities .—Chorhoti, 17,000 feet. About fifty specimens 
of various parts occurred in breaking up the blocks from the 
Chorhoti Pass. Damchen, &c. (Nos. 1678, 1737, 1743, 
1741, 1744.) 
PROSOPISCUS.-Genus novum. 
(Fam. Cheirurid.se.) 
Prosopiscus. Salter, (irpoomrov, a mask.) Caput transversum ; 
glabella brevis, profimde sulcata, lobis lateralibus validis. Gense latse 
convex® punctatse, sine oculis vel sutura faciali. Corpus ignotum. 
Cauda (forsan ?) ut in Cheiruro, spinosa. 
Head transverse, with deep furrows, a short glabella with 
strong direct side lobes, broad convex punctate cheeks, without 
eyes or facial suture. Body unknown. Tail (probably), as in 
Cheirurus, spinose. 
The entire absence of eyes and facial suture is quite enough to 
distinguish the genus from Cheirurus. It is distinguished from 
Llacoparia (a Silurian form with minute anterior eyes) by the 
non-radiating furrows ; and from Typhloniscus , a genus insti¬ 
tuted by myself for a South-African form, also blind and with¬ 
out facial suture, by the shape of the glabella and its non¬ 
radiating furrows. Doubtless the lost portions of the body, 
when found (if any explorers should collect in these snowy 
passes again), will present*corresponding traits of distinction. 
