ORDOVICIAN SYSTEM : LOWER NAUNGKANGYI STAGE. 



gated shales near Pu-pjao in south-western Yunnan, which resemble 

 very closely, judging from Prof. v. Loczy's description, the Naung- 

 kangyi beds of the Shan States. 1 



Dr. Bather remarks, with reference to the new species of this 

 genus described by him, that they all present certain primitive 

 characters reminiscent of the Ordovician Hemicosmites, and that 

 they differ in many respects from any known species oi Caryo- 

 crinus. From which it would seem that the genus appeared in 

 Burma before its occurrence in America. Protocrinus is known only 

 from the lower and middle Ordovician of the Baltic Provinces and 

 the upper Ordovician (Etage D 4) of Bohemia. The new species 

 approaches P. fragum Eichw. but differs in important respects from 

 all known species of the genus. 



The bryozoan Dijrtotrypa, two species of which occur at Sedaw, 

 is by far the most common fossil at that 

 locality. It may be picked up in large num- 

 bers on the slopes of the ravine, and is often found in situ, weather- 

 ing out like a small nodule from the shales. The genus, Mr. 

 Cowper Reed says, is typically Ordovician, of wide distribution in 

 northern Europe, and the sub-genus Mesotrypa, to which he refers 

 the Sedaw species, comes from the Trenton shales (middle Ordovi- 

 cian) of America. The new species D. (Mesotrypa) sedavensis, de- 

 scribed by him, bears a considerable resemblance to M. Whiteavesi 

 Nich., from the Trenton limestone, and M. regularis Foord. The 

 other, unnamed, species from this locality may be only a variety 

 or stage in the growth of M. sedavensis, but it differs in the more 

 discoidal, less elevated shape of the zoarium, in the rather larger 

 relative size of the zocecia, and the less numerous mesopores. 



Fistulipora is a genus ranging from Devonian to Permian, and 

 Mr. Cowper Reed remarks that it is unexpected to find a member 

 of it so low down in the stratigraphical series, but that a species 

 had been recorded from the Galena limestone (middle Ordovician) 

 of Manitoba. The absence of a lunarium renders it possible that 

 this form should be placed in the genus Cyclotrypa Ulrich. 



1 Reiso des Grafen Bela Szechenyi in Ostasien ; Vol. I, p. 767, Vol. Ill, p. 21. My 

 colleague Mr. Coggin Brown tells ine that ho passed through Pu-pjao on his way to 

 Tali-fu in 1907, and that he is convinced that the shah sin question belong to tho 

 Naungkangyi series. Ho was then much pressed for time and could find no Ions. Is , 

 but ho has since made a rich collection from these beds, which is now being worked 

 out (see p. 117). 



