70 



LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



the station to the back of the hill up which the zig-zags of the 

 railway are carried. This hill is composed of Devonian limestones, 

 which are separated from the Ordovician rocks by a fault running 

 north and south along the bed of the ravine at the back of the 

 hill, and crossing the railway just below the third Reversing station, 

 where the crushed and slickensided aspect of the soft Ordovician 

 limestones and shales is very conspicuous. The fossils are found 

 scattered over the slopes on the eastern side of the ravine, and are 

 sometimes found embedded in the shales. They comprise : — 

 Aristocystis dagon, Heliocrinus fiscella, H. rugatus, H. qualus, Oary- 

 ocrinus turbo, C. avellana, C. aurora, and Protocrinus sparsiporus, 

 all new species determined by Dr. Bather ; Diplotrypa sedavensis 

 Reed ; D. sp.; Fistulipora sp. Schizoireta cf. elliptica Kutorga ; Rafi- 

 nesquina imbrex Pander ; Clitambonites cf. pyron Eichwald ; and 

 Poramhonites intercedens Pander. 



Of these fossils Aristocystis is the only genus that has not been 

 found elsewhere than in Bohemia. Accord- 

 ing to Dr. Bather 1 it has not yet been re- 

 corded from America, or from the Ordovician of either England or 

 the Baltic Provinces. Only one species is recognised by Dr. Jaekel 

 as belonging to the genus, namely, A. bohemicus, Barrande, and the 

 Burmese species seems to be sufficiently distinct from this to warrant 

 a specific name, though Dr. Bather calls attention to certain points 

 of similarity. 



Heliocrinus ranges from the base of the Llandeilo to upper 

 Caradoc beds, and is of wide distribution in northern Europe. Of 

 the new species described by Dr. Bather H. fiscella approaches 

 most nearly to H. balticus Eichwald and H. aranea Schlotheim. 

 //. rugatus resembles in its ornamentation H. Helmhackeri Barr. and 

 //. Rouvillei v. Kcenen, but has a less projecting mouth and anus. 

 //. qualus approaches in shape nearest to H. confortatus Barr. and 

 in ornamentation to H. granatum Wahlenb. Caryocrinus is mainly 

 confined to beds of Niagaran (Wenlock) age in the United States, 

 but two species have been recorded from Scandinavia in strata of 

 upper Ordovician age. The only other representative of the family 

 hitherto recorded from Asia is Hemicosmites ? Loczyi Jaekel, 2 from 

 some marly crinoid limestones mterstratified with yellow and varie- 



1 Palceontologia Indica, New Series, Vol. II, Mem. No. 3, p. 13, Pt. I, figs. ]-5. 



2 (). Jaekel, Stammesgeschichte der Pelraatozocu ; I. Theeoide;i unci Cystoidea 

 (Berlin, 1899), p. 315. 



