292 



PSEUDO-RAPHIDIEjE. 



SUB-FAMILY II. PSEUDO-RAPHIDIEjE. 



Frustules 



generally 



bacillar in 



valve view, 



sometimes 



broadly 

 oval or sub- 

 orbicular, 

 very rarely 

 orbicular. 

 Frustules 

 with or 

 without 

 nodules. 



always 



with 



either 



without 



rarely 



' a pseudo-raphe (simple line or 

 blank space) on one or both 

 sides ; or 



septa true or false {vittce) in gir- 

 dle view ; or 



valves fusiform, sigmoid, beaked 

 or alate ; or 



with numerous plicae, costae, 

 striae or rows of transverse 

 granules on one or both of the 

 valves, rarely regularly radiate ; 

 costae sometimes showing in 

 girdle view. 



processes, 



teeth, 



spines, 



awns or 



true raphe 

 on the 

 valves, 



except spines found 

 rarely among the 

 SurirellecB and 

 Tabellariece when 

 the character is 

 sufficiently indica- 

 l ted by the above. 



angular in valve view, 

 hyaline, 

 unstriated, or 



much developed in girdle view, 

 unless longitudinally septate. 



