PLATE 36 A. 
Fig. 1. 521. 3. Heliolites pyriformis? (Pag. 133.) 
1 a. A weathered vertical section of a hemispheric mass, showing the tubes partially in relief upon the sur¬ 
face, with interspaces more abraded. 
1 b. An enlargement of several tubes, showing the structure of the interior. 
1 c. An enlargement from another part of the same specimen, where the cylindrical tubes stand out in relief. 
1 d. A portion of the surface of the same specimen, showing the openings of the cells upon the surface, and 
the intercellular spaces. . 
1 e. An enlargement from fig. 1 d, showing the structure of the surface and the openings of the cells. 
1 f. The base of a weathered calcareous specimen, where the lamellae and septa are nearly all obliterated, 
showing the striated interior and exterior of the tubes. 
1 g. An enlargement of a portion of the preceding figure. 
1 h. A fragment where the walls of the tubes are preserved, the elevated edges appearing to be produced by 
twelve points or granules, with here and there slight evidences of rays. 
1 i. The same enlarged, showing more distinctly the characters mentioned, and also the unequal distances of 
these tubes from each other ; in some cases the walls being nearly or quite in contact, while in others 
they are widely separated. 
1 k. A weathered surface, showing the exterior and interior surface of these cells. 
1 l. A weathered surface of a specimen preserving the cylindrical tubes, where the intercellular spaces have 
been filled with crystalline matter, which has assumed a minutely tubular or cylindrical form. 
1 l f. An enlargement of several of the fluted cells and tubular interspaces. 
1 m. Transverse section of the same, showing the ends of the minute tubes. 
Fig. 2. 522. 4. Heliolites macrostylus. ( Pag. 135.) 
2 a. A transverse section, natural size; the rays for the most part obliterated. 
2 b. A part of the same enlarged. 
2 c. A vertical section, showing the striated surfjtccs and close arrangement of the tu+'eSl 
2 c t- An enlargement of a single cell from 2 c. > ' •*“ . " 
