a. 
PEATE I. 
- AMPLEXOPORA ROBUSTA, n. sp. The surface of a well-preserved 
example, 18 diameters, 
. Tangential section, showing the dnhanain nid at the nagles i the 
cells, and, in many of the cells, the transversely divided funnel- 
shaped thera magnified 18 times. 
. A longitudinal section of same, representing the tubes in the peripheral 
region of a branch. 
. HETEROTRYPA VAUPELI, n. sp. The surface of a frond, enlarged 
18 diameters, so as to show the small granules (spiniform tubuli) 
which surround each cell, Q : 5 : 
. Tangential section, showing the spiniform no an terse tubes, 
enlarged 18 diameters. 
26. Longitudinal section of same, equally enlarged. 
. HETRROTRYPA SOLITARIA, n. sp. The surface of a frond, iad 
18 diameters, 
3a. A tangential section, showing the sell nations Doel antl vee feo 
interstitial tubes, magnified 18 times. 
. A longitudinal section of same, similarly enlarged. 
. DEKAYELLA OBSCURA, n. sp. The surface of one of the small branches, 
enlarged 18 diameters. The two sets of spiniform tubuli are 
readily recognized in well-preserved examples, while the cell- 
apertures are much obscured by the perforated surface pellicle, 
i. Tangential section, enlarged to 18 diameters. 
. Longitudinal section of same, showing one of the large spiniform 
tubuli, and several of the small ones, magnified 18 times. 
5. CALLOPORELLA HARRISI, n. sp. Surface of the discoidal zoarium, 
enlarged to 18 diameters, . : “ A 
A tangential section, enlarged 35 ainineters ahowine whe sual spini- 
form tubuli, numerous interstitial tubes, and the ring like walls 
of the proper zooecia. 
. A longitudinal section of same, enlarged 18 times. 
5c. Represents a section of the natural size, through the center of the 
discoidal zoarium, and shows the relative thickness and diameter 
of a rather large example. 
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