6o 



On< marginal bead between each pan ol Rays. 



c '. ( '</,.•/, rni u, (Grove), I »«. l>\ 



\ marginal beads. I uus } 1 >eby. 



41. Inter-radials distinctl) punctate. * 5 itus, Grev. 



42. Inter-radials smooth. I . t/tar, Brun. 



Group V. PUNCTATA. 



1 .— Raj s moniliform (3). 



2. — Rays not moniliform (5). 



3. — Area quadrate. C. Hardmanianus^ Grev. 



4.- Area oval. C. daemelidnus^ A. S. 



5. — Rays infundibuliform (7). 



6. — Rays not infundibuliform (13). 



7. — Margin headed, two beads per inter-radial ($1,). 



8. — Margin not beaded (9). 



9. — Area with a broad circlet ol longish, dark, sub-parallel lines. 



C. Sc/iLinitzii, Jan. 

 10.- No circlet of any kind (11). 



11. Area small, central oval. C. chrysanthemum^ T. and 11. 



1 _\ Area large, circular. ('. c/ivosus, J. Brun. 



Atlas, pi. 55, I. 4, 5, 6. The true C. bicostatus^ \Y. Sm., is a much more 

 delicate form, [ts inter-radials and inter-striae can generally only lie seen t<> 

 be striate under an immersion lens, while in Grunow's form both are rela- 

 tively punctato-striate, the puncta being elongate. This last Dint 

 think may doubtfully be considered as an extremely small variety, with inter- 

 rupted rays of Camp. clypeuSy l.hr. I have seen what seems to he a sporangia! 

 valve ol W. Smith's form, measuring vS0$ in diameter, from Mr. Kitton's 

 cabinet, labelled from ( 'hristianstadt, in which the inter-striab are more dis- 

 tinctly striate, while the inter-radials remain smooth. 



