ORDOVICIAN SYSTEM: LOWER NAUNGKANGYI STAGE. 77 



Returning to the vicinity of the railway between Sedaw and 



Maymyo, the lower Naungkangyis are ex- 

 Inliers near Maymyo. . . .. . , , . 



posed as inkers in one or two places, being 



probably brought up by anticlinal folds, though the structure 



cannot be made out with certainty, owing to the thickness 



of the jungle. Fossils were collected at the 

 Fossils, Lebyaungbyan. . n , T , , , /T QO 



following places : — lebyaungbyan (Loc. 00, 



B 4), five miles west of Maymyo, at the crest of a ridge 



immediately west of the village, including Rhinidictya sp. ; Phyll- 



oporina orientalis Reed ; Rafinesquina imbrex Pander ; Leptcena (?) 



ledetensis Reed ; Chonetes (?) thebavensis Reed ; Orthis testudinaria 



Dalman ; Porambonites intercedens Pander ; and Cyclocrinus cf . 



Spasski Eichw. Of these Phylloporina is a bryozoan ranging from 



Ordovician to Silurian, and the species desciibed by Mr. Cowper 



Reed resembles in some respects the Ordovician Protocrisina 



exigua Ulrich, but differs in its mode of growth and other characters. 



Leplcena (?) ledetensis is a new species described by Mr. Cowper Reed 



from the upper Naungkangyi beds of Ledet, three miles north-east 



of Lebyaungbyan, and its presence here seems to indicate that the 



horizon of the Lebyaungbyan beds is rather higher in the series 



than that of the beds hitherto described (Porambonites intercedens, 



Rafinesquina imbrex, and Orthis testudinaria being the only species 



found here which also occur in lower beds). In the shape and 



convexity of the valves and internal characters it resembles the 



well-known Wenlock and Ludlow fossil L. rhomboidalis Wahlenb. 



The presence of Chonetes so low down as the Ordovician has not 

 hitherto been recorded, and the reference of the single specimen 

 from Lebyaungby n to it is doubtful. Cyclocrinus Spasski, a pecu- 

 liar organism of somewhat doubtful affinities, occurs in the Ordovi- 

 cian beds of Russia. The rock here is a greenish sandstone, pass- 

 ing into a greenish, granular limestone. 



At Makyinu (Machinu) (Loc. 84, B4), about three miles south of 



Lebyaungbyan, at the head of a steep descent 

 Fossils, Makyinu. "„ . 0 " . , - r 



to hakangyi, the lol lowing fossils were col- 

 lected from a tough, greenish, micaceous sandy shale: — Protocrinus 

 sparsiporus Rather, a Sedaw form ; Cheirocrinus sp. ; Caryocrinus 

 sp. ; Rhinidictya cf. plumula Salter ; (?) Diplotrypa sp. ; Plectambonites 

 quinquecoslata McCoy ; Orthis (Dalmanella ?) chaungzonensis Reed ; 

 and 0. irravadica Reed. Rhinidictya of. plumula is, according to 

 Mi. Reed, comparable with Salter's Ptilodictya plumula, from the 



