; PLATE 25. 
Fig. 1. 105. 3. SrreprELaAsMA coRNICULUM. (Pag. 69.) 
1a. A small nearly perfect individual. 1b. A larger specimen. 
lc. A short and less curved specimen, with the surface distinctly marked. 
1d. A portion of the surface of the last enlarged. 
Fig. 2. 106. 4. STrREPTELASMA CRASSA. (Pag. 70.) 
a. Lateral view of a specimen, the edges somewhat broken. 
b. Longitudinal section, showing the internal arrangement of the lamelle. 
wo WwW Ww 
c. View of the cup, showing imperfectly the meeting of the lamelle in the centre. 
Fig. 3. 107. 5. SrREPTELASMA MULTILAMELLOSA. (Pag. 70.) 
3 a. Lateral view of a specimen, somewhat shortened from wearing off of the smaller extremity. 
3 b. Transverse section, showing the thin lamelle. 
3 ¢. An enlarged portion of the denuded outer surface. 
Fig. 4. 108. 6. STREPTELASMA PARVULA. (Pag. 71.) 
4 a. The lower part of a specimen of ordinary size, with the margin of the cup broken off, showing the lamelle 
within. 
4 6. Transverse section of the same, showing the simple radiating lamelle. 
4c. A group of the same. Three of the specimens lie upon the surface of the stone, with their bases nearly in 
contact. 
Fig. 5. 109. 1. Porires? veTusTa. (Pag. 71.) 
5 a. Surface of the specimen, a part only showing the cells. 
5b. A portion magnified. The figure on the right hand is one of the cells more distinctly enlarged, 
Fig. 6. 110. 1. ——— cyartuirormis (Genus undetermined ). (Pag. 72.) 
6 a. View of specimen, looking upon the upper or inner surface. 6 b. Lateral view. 
6c. Enlarged portion of the inner surface, showing the structure and arrangement of the cells. 
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