Analytical Tables for the 

 Determination of the Campylodisei 



Table for the arrangement into Groups of the forms 

 of Campylodiscus. 



i- — Valves with a narrow, smooth, central space, or longitudinal 

 line (Raphe). Group I. Raphidae. 



2. — Valves with a broad area instead of a linear blank space or 

 line (3). 



3- — Area clearly defined and limited by internal termination of 

 the Rays (5). 



4. — Area undefined (or null from absence of the Rays). Group 

 II. Vagae. 



5.— Area smooth, unadorned.* Group III. Hyalinas. 



6. — Area either striated or punctate (including punctato-striate). 



(7). 

 7. — Area bearing distinct striae. Group IV. Striatae. 



8. — Area simply punctate or punctato-striate. Group V. 

 Punctata. 



" Under very high powers, often very minutely dotted. 



4 



