120 LA TOUCHEj GEOLOGY OF NORTHERN SHAN STATES. 



The rocks of this formation consist for the most part of red or 

 chocolate brown limestones passing into grey 



^Lithological charac- or br ; ght and 80metimes purple lime . 



stones. Bands of red clay are interbedded 



with these, and the limestones themselves usually contain a large 



amount of argillaceous matter, in such cases presenting a peculiar 



lenticular structure, like that of the German ' Knollenkalk ' or ' Netz- 



kalk. ' It also resembles that already described as characterising 



the more calcareous portions of the purple band at the top of the 



upper Naungkangyis (p. 92). 



The large fossil named Echinosphcerites Kingi by Dr. Noetling 



has since been examined and fully described 

 Camarocnnus. , ' 



by Mr. lowper Keed, whose account of it 



is published in the Pala?ontologia Indica (Op. cit., p. 88, PI. VIII, 

 iigs. 16, 16a-e), under the name of Camarocrinus asiaticus. (A photo- 

 graphic reproduction of the type-specimen is given in Plates 25 and 

 26). The genus has been studied by Prof. Schuchert, 1 who has 

 described several species from the Helderberg Group of West Virginia, 

 Indian Territory and Tennessee, U.S. A. In Bohemia a similar fossil, 

 named Lobolithus by Barrande, is found, but at a lower horizon, 

 namely, in the stages E 1 b and E 2, whereas the Helderberg Group 

 corresponds to the Bohemian stage F. The organism was conjectured 

 by Hall to be a chambered bulb attached to the root of a crinoid. 

 to act as a kind of float or anchor to the body and arms. 

 Prof. Waagen and Dr. Jahn of Vienna, who have described the 

 specimens collected by Barrande, agree with this view, but Dr. 

 Jahn also supposes that they might represent ' brood receptacles ' 

 (Brutsbehdlter), and that some of them were a modification of the 

 root of Seyphocrinus, with which they are often found in associa- 

 tion in Bohemia. Prof. Schuchert, however, does not accept the 

 views of Dr. Jahn on these latter points, remarking that Seypho- 

 crinus is unknown in America, and that in the beds in which Cama- 

 rocrinus occurs in large numbers, the remains of other crinoids are 

 very rare. He is also convinced, from inspection of the actual 

 occurrence of Lobolithus with Scyphocrmus in Bohemia, that the 

 connection between the two is fortuitous (Op. at., p. 262). He 

 suggests, however, that since Camarocrinus was evidently not a 

 complete animal, nor the theca of either a cystid or crinoid, being 



1 Silurio and ljovonic Cystidca ; Smithsonian Aliscdl. Coll., Vol. XL VII, Pt. 2, pp. 

 53 -272. 



