57 



49- — Area oval or reniform (51). 



50. — Area elliptical, with acute apices. < '. phalangium, VS. 



51. — Area reniform. Large, marginal inter-radial heads. 



' Mullcri, A. S. 



52. — Area oval. No marginal beads. C. rotula, Grun. 



53. — Rays originating in large marginal beads. 



C. helianthus^ A. S. 



54. — No marginal beads. C. annularis, Greg. 



55. — Rays long, very fine, close, and numerous. C. radiosus, Ehr. 



56. — Rays very short, tooth-like (57). 



57. — -Rays with rounded ends internally. Inter-radial spaces 

 rounded at base near margin. Inter-radials with one 

 row of dots. C. margosinuatuS) Deby. 



58. — Rays bifid at apex internally. Inter-radials with four rows 

 of dots. C. albifrotis, Brun. 



Group IV.— THE STRIATA. 



1. — Area with a central stellate figure of fusiform, apiculate, 

 moniliform stria?, which do not reach the margin. 



C. co ruse us, A S. 



2. — Area not bearing a central star formed of fusiform stri e 



3. — Striated portion of Area limited to a narrow, parallel-sided, 

 central, longitudinal band or zone (5). 



Striated Areanot limited to a narrow, linear, central, parallel- 

 sided, longitudinal /.one (7). 



5. — Striate area bounded on each side by a smooth, lunulate 

 space. C. Sumat)\nsis, Leud. 



