﻿PLATE II. 



All figures, unless otherwise designated, are magnified 18*diameters. 



PAGE. 



Fig. 1. Evactinopora radiata, M. and W. A nearly entire specimen of 

 this species. On the right side a ray is restored in outline. Nat. 



size, 42 



la. Basal view of fig. 1. Natural size. 



16. A tangential section of one of the rays, showing wall inflections, in- 

 terstitial vesicles, and secondary perforated deposit. 



lc. Longitudinal section, showing zocecia, interstitial vesicles, and sec- 

 ondary deposit, with the minute vertical canals. 

 Fig. 2. Peismopora SERRTJLATA, n. sp. A fragment with transverse section 



underneath. Natural size, 41 



2a and 26. Two views of another fragment showing mode of branching. 

 Natural size. 



2c. Tangential section of one of the faces. 



2d. A longitudinal section of one of the three leaves. 



2e. Portion of a transverse section, showing the tripartite character of 

 the zoarium, and the divisional laminse. 



2f. Surface of fig. 2, enlarged 8 diameters, showing arrangement of cells, 

 and non-poriferous spaces. 

 Fig. 3. CYSTODICTYA ocellata, Ulrich. Tangential section of this species, 

 showing the bidenticulate zooecia. Those on the right side are 

 cut at a deeper level, and here a few of the interstitial vesicles 

 are shown, 36 



3a. A vertical section, showing three zooecia andcharacter of interstitial 

 spaces. On the opposite side the section passes between two 

 rows of zocecia. 



Fig. 4. CYSTODICTYA line ATA, n. sp. A portion of a large specimen in .the 



authors cabinet. Natural size, 37 



4a. Surface of same enlarged. Shows the arrangement and form of the 



zooecia near the center of a branch. 

 46. About half of a transverse section. 



4c. A tangential section passing a little obliquely through the zoarium, 

 so as to show the inner and more superficial characters of the 

 zocecia and interstitial spaces. 

 Fig. 5. Cystodictya gtlberti, Meek, sp. Tangential section. The left side 

 of. the figure shows the bidenticulate character of the zocecia 

 near the surface. Toward the right side the section gradually 

 passes into the immature region near the median laminse, . . 36 



5a. Portion of a transverse section showing the vertical plates between 

 which the zocecia are arranged. 



56. A longitudinal section passing a little obliquely through the branch, 

 so as to show the entire outline of three zocecia on one side. 

 Fig. 6. COSCINIDM CYCLOPS, Keyserling. A tangential section of this species. 



A section prepared siuce the plate was printed, shows beside 

 the small dots in the interstitial spaces here shown, a much larger 

 number of more minute dots. These are about as numerous 

 as in fig. 16. 38 



