ORDOVICIAN SYSTEM : UPPER NAUNGKANGYI STAGE. 



95 



allied to P. Panderi Schmidt, and belonging to a sub-genus of the 

 Phacopidce strictly confined to the Ordovician ; a Strophomena allied 

 to S. corrugatella Davidson, confined in England to the Llandeilo 

 and Caradoc formations, but ranging in Scotland to the middle 

 Llandovery ; and a brachiopod which Mr. Cowper Reed thinks 

 resembles Christiania tenuicincta McCoy, also a Caradoc form. Near 

 the head of the Nam-Ha (Loc. 74, I 3) I found a single specimen 

 of a large Bellerophon (Sinuites) in these beds, and on the roadside 

 near Kanlun, a mile south of Hwe-hok, Mr. Coggin Brown picked 

 up a distinctly preserved specimen of Agnostus, the only one of 

 this genus that has so far been found. The fragment in which 

 it occurs was unfortunately not in situ, however, and the horizon 

 from which the specimen originally came is doubtful. 



On the eastern slopes of the hills east of the Nam-Ha, facing 

 the broad valley of the Nam-Pang, another 



Nam-Fang valley. . / 



wide band of these purple rocks occurs, and 

 small collections were made at two places : on the path from Nam- 

 pung to Nawng-yun (Loc. 78, J 3), near the head of a small 

 ravine about a mile east of the latter village, where the pygidia of 

 Pliomera ingsangensis Reed were found in considerable numbers in 

 a bed low down in the series, together with as yet undetermined 

 species of Asaphus and Phacops (Pterygometopus) ; and near Hsophi 

 (Loc. 79, J 4), close to the southern end of the band, where the 

 collection made includes Asaphus (Ptychopyge) sp. (aff. Lawrowi 

 Schm.), Christiania tenuicincta (?) McCoy, and species of Hyolithes 

 and (?) Ptilndictya. 



The purple beds are again well developed along the eastern side 

 of the Loi Pan range, extending from the 

 East side of Loi Pan va n ey of the Nam-La, between Man Pun 

 and Loi Twang. -i ' 



and M6ng-La, to that of the Nam-hen west of 



Ping-hsai, the whole of this mass of hills to the east of the lower 

 Naungkangyi band being composed of them. The thickness ex- 

 posed must be very great, though it is impossible to measure it on 

 account of the numerous folds into which the strata have been 

 thrown. South of the Nam-hen the purple beds continue across 

 the flanks of Loi Kok, shifted to the east by the transverse fault 

 along the valley of the Nam-hen, and occupying all the ground 

 up to the valley of the southern branch of that river. They are 

 then thrown back to the west by the Kehsi Mansam fault, and 

 form all the foot-hills parallel to the Loi Twang range as far 



