BRACHIOPODA. 
37 
over half the length of the shell. A thick median plate 
reaches four-fifths from the beak to the margin, within which, 
at some little distance, a strong concentric ridge runs all 
round. The shell is thick, the stria? only show near the mar¬ 
gin internally. 
Locality. —Damchen. Chorhoti Pass: Milam Glacier. 
(Nos. 923, 929, in arenaceous grit, 1678, 1722, 1737.) 
STROPHOMENA NUBIGENA. 
Plate 3, fig. 11. 
S. uncialis et ultra, semicircularls, angulis acutis ; valvis lente 
curvis, ventrali convexiore, altera plana seu concava, striis confertis 
subsequalibus filiformibus radiata. Striae concentricse aut rugae car- 
dinales nullae. Cicatrices interni ut a divergentes, angusti. 
An inch and a quarter wide, and eight lines long ; semicir¬ 
cular, with slightly-produced ears, thin; ventral valve gently 
and regularly convex, the other flat or slightly concave be¬ 
neath the beak. Both are covered with fine, but not close, 
radiating strise, interlined by others equally slender. No con¬ 
spicuous lines of growth, or rugae near the hinge; the surface 
remarkably even and regular. Within, the ventral valve has 
a pair of remarkably elongated narrow oval muscular impres¬ 
sions, reaching less than half down the shell in a v-shape re¬ 
versed, like and widely divergent at their ends by an inter¬ 
val of more than their own breadth. Dorsal valve with a 
short central ridge, and widely-diverging teeth. The stronger 
striae show internally as ribs on the margin. 
Locality .—Upper Rimkin. (R.) 
STROPHOMENA BISECTA. 
Plate 3, fig. 12. 
S. semiunciam longa, £ lata, semiovalis, angulis, rectis. Valva 
ventralis lente conveva, tenuicostata, striis intermediis, costaque cen- 
trali maxima, striis transversis minutissimis lineisque incrementi rugo- 
sis. Valva altera plana striata, nec costis eminentibus. Rugae car 
dinales conspicuae. 
Apparently never more than eight lines broad or six long; 
generally smaller, with rectangular ears and a long semi-oval 
