CONSPECTUS OF THE KAMIKIKS AM) <;KAKK\. :>1 



| Frustules cuneate in f. v., lunate in s. v 9 



' I Frustules uot as above 11 



( Valves cellulose, center blank, margin veined 



9. I Hemidifteiis xcix. 



(. Valves not as above 10 



f Valves with indistinct umbilicus, finely punctate 

 with radiating lines, dorsal and ventral margins 



10. -| with minute teeth or spines I'a/uui -in c. 



j All others, dorsal margin without spines, ventral 



[ frequently with pseudo-nodule EIODIA ci. 



f Disc with a radiating series of small, equal or sub- 

 equal granules ; and generally with a granular 



11. -I umbilicus or center; marginal teeth or spines 



rarely absent STEPHANODISC TS < 'i i . 



Valves not as above - -12 



Valves circular ; much inflated. Frustules in f. v. 

 with the longitudinal axis much longer than the 

 , transverse; uot ribbed, nor cellulose ; sutural por- 

 tion ("connecting zone") narrow; sometimes 



minute marginal teeth PYXIDICULA cm. 



Valves not as above 13 



Valves elliptic, circular, or sub-angular ; with a 

 prickly aspect (hispid ; ofteu with minute spines, 

 and with siuuato- reticulate rays or lines. ..Lira<Jiri(* civ. 

 1 Valves not as above.... ....14 



Disc circular or angular ; with conspicuous punctae ; 

 and divided into more or less plicate compart- 

 ments, often obscurely, by radiating, often dicho- 

 14. -' touming, lines or blank spaces ; center sometimes 

 bullate, or more or less distinctly reticulate.. 



STKTomscrs cv. 



Valves not as above "15 



I Frustules compound. Disc circular, with numerous. 



strong, straight, radial ribs; and a hyaline center; 

 , ribs connected by concentric lines, or rows of gem 



niaceous granules without spine oi- teeth 



i 



A UA< -lINnlDISICl'S C\ I. 



I Frustules not as above... 



Disc with a circle of well-defined marginal or inlra 

 marginal (subulate i spines; cellules in parallel 

 rows... Xi/Nt<')>lunii<t evil. 



(Cellules not in parallel rows, val\cs(!' 



CRESWELLIA=STEPHANOPYXIS .' i.vm. 

 Valves not as above ' ' 



