PLATE 25. 



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



1 a. A small nearly perlecl individual. 1 b. A largev specimen. 



1 c. A slioi-t and less curved specimen, with the surface distinctly marked. 

 1 (/. A portion of the surface of the last enlarged. 



Fig. 2. 106. 4. Streptelasma crassa. (Pag. 70.) 



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



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



2 c. View of the c\ip, showing imperfectly the meeting of the lamellEB in the centre. 



Fig. 3. 107. 5. Streptelasma multilamellosa. (Pag. 70.) 



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

 3 b. Transverse section, showing the thin lamellse. 



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



Fig. 4. 108. 6. Streptelasma parvula. (P=>g- 71.) 



4 (i. The lower part of a specimen of ordinary size, with the margin of the cup broken off, showing the lamellae 



within. 

 ■1 b. Tran.sverse section of the same, showing the simple radiating lainelltp. 

 I c A group of the same. Three of the specimens lie upon the surface of tlic stone, wifli llicir bases nearly in 



contact. 



Fig. 5. 109. 1. Porites? vetusta. (Pag. 71.) 



!> a. Surface of the specimen, a part only showing the cells. 



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



Fig. 6. 110. 1. CY ATTnvonuis {GeTtustrndetermined). (Pag. 72.) 



(i a. View of .specimen, looking upon the upper or inner surface. b. Lateral view, 



li r. lOnlarged portion of the inner surface, showing the structiu'e and arrangement of the cells. 



