PLATE 33. 



Fig. 1. 50S. 1. DlPLOPHYLLUM CiESPITOSUM. ( P^?- 116.) 



1 a. A single cell with a lateral bud on one side. The weathered portion near the top of the specimen shows 



very distinctly the transverse dissepiments. 

 1 i. A specimen cut obliquely, showing the transverse dissepiments in the inner circle of the cell. 

 1 c. A group formed by budding from a single stock below. One of the buds is broken off near the base. 



The exterior surface is well preserved in this specimen, showing the fine transverse striae. 

 1 d. A small group, showing one mode of budding. The continuation of the righthand portion of the figure 



has been broken off. 

 1 c. A cylindrical specimen, contracted at intervals from intermitted growth, and showing a tendency to 



budding at these points. On the lefthand side are two buds broken off; and on the righthand side are 



the germs of three other buds which have not expanded. 

 1 /. A portion of fig. 1 a enlarged, showing the transverse dissepiments uniting the lamellae. 

 1 g-, U. The cell natural size and enlarged, showing the denticulated appearance of the lamellae, arising from 



the dissepiments being partially preserved at the junction with the lamellje. 

 1 i. A vertical section of the cell. 

 1 A:. A fragment showing the ends of the several stems standing out above the weathered surface, having the 



exterior portion still cellular, while in many of them the centre is solid. 

 \ I. K polished section of a less crystalline specimen, showing the ends of several stems. 

 1 in. A part of a larger group, showing the manner of budding and increase. 

 1 n. A single stem with two buds in the lower part, which are broken off near the stock; while near the 



upper part the buds are numerous, and thrown out on all sides. 

 1 0. A longitudinal section of several stems, showing the tran.sverse dissepiments, which, near the base of one 



stem, are bent downwards in the middle, and are otherwise irregular in other parts of the stem. 

 1 f, r. Longitudinal sections from two different groups, showing irregularity in the transverse sejita of the 



centre of the cell. 



Fig. 2. 509. 2. DlPLOPHYLLUM c^spitosum? ( P^g- 118.) 



Fig. 3. 510. 1. Syringopoka? mult.icaulis. ( P^g- 119.) 



8 a. A small part of a larger group of these tubes from a silicious specimen. 



3 6. A transverse section, showing the ends of the tubes. 



3 c, d. The end of a tube, natural size and magnified. 



3 e. A separated tube, showing contraction at intervals, with a shorter one at the base, and a bud proceeding 

 appararently from betweea them . 



3 /. A longitudinal section from the top of the cup downwards, showing in the upper part the simple rays, 

 and below the complicated oblique septa. 



S g. A longitudinal section of a tube, the middle of the figure reaching to the centre of the tube, and show- 

 ing oblique septa, while at the two ends only the lamelte are seen. 



