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PLATE 25. 



Fig. 1. 105. 3. Stkeptelasma corniculum. (Pag. 69.) 



1 a. A small nearly perfect iniiividual. 1 6. A larger specimen. 



1 e. A short and less curved specimen, with the surface distinctly marked. 

 1 rf. A portion of the surface of the last enlarKed. 



Fig. 2. 106. 4. Stbeptelasma ckassa. (Pag. 70.) 



. 2 a. Lateral view of a specimen, the edges somewhat broken. 



2 b. Longitudinal section, showing the internal arrangement of the lamelte. 



2 e. View of the cup, showing imperfectly the meeting of the lamella in the centre. 



Fig. 3. 107. 5. Streptelasma multilamellosa. (Pa?- 70.) 



3 a. Lateral view of a specimen, somewhat shortened from wearing off of the smaller extremity. 

 3 b. Transverse section, showing the thin lamelliB. 



3 c. An enlarged portion of the- denuded outer surface. 



Fig. 4. 108. 6. Streptelasma parvttla. (Pag- ''^0 



4 a. The lower part of a specimen of ordinary size, with the margin of the cup broken olT, showing the lamellte 



within. 

 4 6. Transverse section of the same, showing the simple radiating lamell:e. 



4 r. A group of the same. Three of the specimens lie upon the surface of the stone, with thoir bases nearly in 



contact. 



Fig. 6. 109. 1. Pobites? VETU8TA. (Pag. 71.) 



5 a. Surface of the specimen, a part only showing the cells. 



r> b. A portion magnified. The figure on the right hand is one of the cells more distinctly enlarged. 



Fig. 6. 110. 1. CYArmFonviia {Genus undetermtTied). (Pag. 72.) 



6 a. View of specimen, looking upon the upper or inner surface. 6 ft. Lateral view. 



n r. Enlarged portion of the inner surface, showing the structure and arrangement of the cells. 



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