PLATE VL. 
All the figures excepting fig. 2, are enlarged to 18 diameters. 
| 2 fae 
la. 
Fig. 2. 
8a. 
Fig. 9. 
9a. 
SPATIOPORA MONTIFERA, n. sp. Tangential section showing the 
peculiar spongy structure of the cell-walls, : : 
Longitudinal section showing the entire length of the epee An 
interstitial tube, and a few diaphragms are represented. 
LEPTOTRYPA MINIMA, n. sp. A specimen showing the small monti- 
cules. and the general appearance of the zoarium of this species, 
as it is invariably found growing upon the shell of an Orthoceras, 
. Tangential section representing the cells, spiniform tubuli, and one of 
the monticules. 
. Longitudinal section through the entire length of fhe tubes. 
. LEPTOTRYPA CLAVIS, n. sp. A tangential section of this species ex- 
hibiting the somewhat ere cells, and the small but distinct 
spiniform tubuli, 
. Longitudinal section of a specimen atiaoned £6 a oniabid column. 
. LEPTOTRYPA ORNATA, n. sp. The upper half of this figure represents 
a portion of a tangential section, and shows only cells of the 
average size, with the spiniform tubuli at their angles. The lower 
half represents a longitudinal section of the zoarium from the shell 
of the Cyrtolites upon which it is growing to the tube-apertures, 
. DEKAYIA ASPERA, Elwardsand Haime. A tangential section of this 
species inserted for comparison, 
. DEKAYIA TRENTONENSIS, n. sp. Tangential section. The lower 
portion of this figure represents a portion of one of the groups of 
slightly larger cells, 
. A portion of a longitudinal section, Snowing several oe the epunntoen 
tubuli, thickening walls, and numerous diaphragms. 
. DEKAYIA APPRESSA, n. sp. A small portion of the surface without 
the pellicle, 
. The same with the pelvele: The cell-walls are a little too distinct. 
. A tangential section of this species, showing the comparatively small 
spiniform tubuli, and thin walls. 
. DEKAYIA MULTISPINOSA, n. sp. A tanzential section, showing the 
numerous spiniform tubuli, and on one side a group of the small 
cells, 
Represents the per roheral outing oft a loneitadinial kection 
DEKAYIA PELLICULATA, n. sp. A tingential section of this species, 
exhibiting the small cells and spiniform est between the 
ordinary cells, : 5 : r 
A por:ion of the peripheral region of a Todgiudinal section, showing 
the unequiul tabulation of the tubes. 
Fig. 10 DEKAYIA PAUPERA, n. sp. Tangential section, showing in the upper 
portion a part of one of the groups of large cells, and the small 
spiniform tubuli, 
10a. The peripheral portion of a fan etiatinal section of this species. 
PAGE 
168 
161 
160 
154 
