ON THE PAGODA STONE OF THE CHINESE. 403 



become contracted into something like the form of 

 a broad-arrow barb (6) on each side of the siphuncle, 

 the intervening space (c) between the outer shell and 

 the lining membrane of the chamber being filled 

 with spar; and the same can be seen more or less 

 distinctly in the next four smaller chambers (a 21-24). 

 The part which forms the barb of the arrow has 

 a black margin surrounding a clear central sparry- 

 portion. Dr. Woodward's plate shows the same 

 separation and contraction of the lining membrane 

 of the chamber. When the specimen is held up 

 before a bright gas-flame, this is all seen more 

 distinctly, and the siphuncle and division into cham- 

 bers can be traced to the apex of the shell. In 

 these latter the contraction of the chambers has 

 gradually increased till the section represents only a 

 small projection on each side of the siphuncle. 



In Mr. Dowsley's specimen the chambers are 

 more uniform in size. The broken one at the 

 edge is filled with spar; in the next two it is 

 mixed with greystone; while the next two, and 

 on the other side all four, are filled with spar. 

 The three following are filled with greystone, and 

 have the chambers defined by the thread of calcite, 

 and the intervening septum by greystone ; on the 

 opposite side they are j)artly filled with spar. The 

 next four (10th, 11th, 12th, and 13th) are filled with 

 greystone, and are all lined with the thread of 

 calcite, with the septum in greystone between them. 

 On the other side one-third of the 10th, and the 

 whole of the 11th, is filled with greystone ; while 

 the 12th and remaining chambers to the apex are 

 filled with spar and are more or less hazy, but on 

 wetting the stone the septa of the chambers are 

 all brought out, and even a portion of siphuncle 

 is seen on the 18th and three following chambers. 

 The last 2^ inches to the apex are transparent. 



This beautiful tapering specimen would probably 

 be two or three inches longer, and not being dis- 

 figured, as I might say, by the siphuncle, would, I 



