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Fig. 1. Montictjlipoea L^EVIS, n. sp. View of the under side of a free speci- 

 men, natural size, 236 



la. Transverse section of same, enlarged 18 diameters. The lower portion 



cuts through one of the groups of large cells. 

 lb. Longitudinal section of same, enlarged 18 diameters. 



Fig. 2. Monticulipoka CONSIMILIS, n. sp. Natural size, view of the type 



specimen, 238 



Fig. 3. Monticulipoka parasitica, n. sp. Longitudinal section, magnified 



18 times, 238 



3a. Transverse section of same, enlarged 18 diameters. 



Fig. 4. Monticulipoka wetherbyi, n sp. View of two complete colonies, 



and portions of two others, natural size, 239 



4a. Tangential section of same, enlarged 18 times. 



4b. Longitudinal section of same, magnified 18 diameters. 



Fig. 5. Monticulipoka mammulata, D'Orbigny. Transverse section, en- 

 larged 18 diameters, 234 



5a. Longitudinal section of same, equally enlarged. 

 Fig. 6. Homotrypa OBLIQUA, n. sp. Natural size, view of an example more 



strongly tuberculated than is usual, 243 



6a. Surface of same, enlarged to 18 diameters. 



6b. Tangential section showing connecting foramina, small spiniform 

 tubuli, and cvstoid diaphragms. 



Fig. 7. Homotrypa curvata, n. sp. Natural size, view of atypical example 



of this species, 242 



7a. Surface of same, enlarged to 18 diameters. The lower portion of the 



figure represents one of the stellate maculae. The cells along the 



upper margin are of the average size. 

 7b. Represents the cells in the axial region of a transverse section. The 



cruciform lines which cross the calcite filling the tubes, are not 



shown. 



7c. A longitudinal section of same, enlarged 18 times. 



Id. A tangential section showing spiniform tubuli, and connecting 

 foramina, magnified to 18 diameters. 



Fig. 8. PERONOPORA UNiFORMis, n. sp. A vertical section showing the 

 median lamina and a few cells of one of the leaves of the zoarium, 



enlarged 18 diameters, 244 



8a. Tangential section of same, showing the angular cells, and small 

 number of interstitial tubes which characterize this species. 



