ORDOVICIAN SYSTEM: NYAUNGBAW LIMESTONES. 



121 



devoid of either ambulacra, mouth, or anus, and was apparently 

 intended to be a float of some kind, it drifted away on the 

 death of the individual to which it belonged, shedding the crown 

 and stalk, and finally, becoming filled with water, sank to the 

 sea bottom at a distance from its original habitation (Op. citi, 

 p. 267). This supposition would explain why it is that crinoid 

 calices and other fragments are so rarely found associated with 

 Camarocrinus . 



It is worthy of remark in this connection that Camarocrinus 

 .,, „ asiaticus is associated, in the Nyaungbaw 



Association with Scy- ... 

 phoerinus in Burma. Limestone, with large numbers of the remains 



of a crinoid, which Mr. Reed has recognised 

 as probably Scyphocrimis, the genus that is commonly found to- 

 gether with Lobolithus in Bohemia. At the 21st mile on the cart 

 road, about 2 miles west of Nyaungbaw (Loc. 70, B 5). Mr. Datta 

 discovered whole slabs of rock, a pink limestone, covered with the 

 interlaced brachial ossicles and stem joints of this crinoid, and I 

 have since found imperfect specimens of Camarocrinus in the same 

 bed. On the other side of Nyaungbaw also, near Yemeye (Loc. 

 71), at the foot of the zig-zags leading up to Pyintha, where the 

 best preserved and most numerous specimens of Camarocrinus occur, 

 an imperfect calyx was obtained, closely allied, according to Mr. 

 Cowper Reed, to Sc. excavatus, from Etage E 1 — E 2 of Bohemia. 

 The association of Camarocrimis with Scy phoerinus, both in Bohemi-i 

 and in Burma, is certainly suggestive of a more intimate connection 

 between the two genera than Prof. Schuchert is willing to admit, 

 but it must be confessed that no specimens have yet been dis- 

 covered that point to anything more than a merely accidental 

 grouping together of the remains in the same beds. 



In a short review of Mr. Cowper Reed's work, published in the 

 American Journal of Science (4th series, Vol. 



JwSSmL NyaUDg " XXV ' P- 262 >' Prof - Schuchert takes excep- 

 tion to the position assigned by me to the 

 Nyaungbaw beds at the top of the Ordovician system, and remarks 

 that "the pahcontological evidence " as then presented "clearly 

 places this formation in close association with the Zebingyi beds," 

 at the base of the Plateau Limestone. But when it is considered 

 that Camarocrinus belongs to very different horizons in Bohemia 

 and America respectively, — no less than four formations intervening 



