Bacillaria. ] 



THE INFUSORIA. 



177 



The Bacillaria comprehend the following genera : 



/'three-sided. 



/ prism 

 shaped 



One 

 valved. 

 (Desmi- ( 

 diacea) 



j four-sided . 

 (five-sided 



globular J 



( clusters moniliform 



'" ( do. berry-like 



\ spinous 



band-like 



I 



^.flat ... 



round 



{ compressed or lying together 

 ' (united by serritures 



( many in each plate or disc 

 plate or disc-like ...-< two ditto 



(single and disc-like 



spherical, simple 



( l-celled,articulated filiform 

 forming coral-like J 



clusters ( many celled, concentrically 



Two or 

 more I 

 valved. ( 

 (Navicu-\ 

 \ lacea). 



self-division complete, . 

 never band-like 



division incomplete, 



forming band-like 



clusters 



six openings to lorica ... 



four ditto 



one ditto 



/wand-like 



jointed 



(plate-like 



1 jointlessf bandsstrai & nt 

 X. L ragl 6 ' ( bands spiral ... 



single individuals broader than long 



formed as a wand (prism-shaped) 



formed as a wedge 



/ dichotomous by long. div. 



/ stalkless, f 

 sessile j 



wedged-shaped 



( whorled or radiating by do. 



Covered with an amo 

 phousmassof gelatine . 



stalked ' lance-shaped, attachment direct 



banner-like, f a central 

 ^ attachment oblique j 



scattered 



connected in a ring-like manner 



no central opening 



Covered with membranous 

 or gelatinous tubes .., 



f spiculi straight 

 tubes simply branched J 



( ditto crooked 



ditto 

 b 



ted, 



slit like a bunch 



branched like a tree 



Appended group. Lorica simple, singly stalked, soft-valved, with many retractile } 

 (not vibratile) Tentaculae / 



Desmidium. 

 Staurastrum. 

 Pentasterias. 

 Tessararthra. 

 Sphaerastrum. 

 Xanthidium. 

 Arthrodesmus. 

 Odontella. 

 Micrasterias. 

 Euastrum. 

 Microtheca. 

 Pyxidicula. 

 Gallionella. 

 Actinocyclus. 

 Navicula. 

 Eunotia. 

 Cocconei's. 

 Bacillaria. 

 Tessella. 

 Fragilaria. 

 Meridion. 

 Isthmia. 

 Synedi-a. 

 Podosphenia. 

 Gomphonema. 

 EchineUa. 



Cocconema. 



Achnanthes. 



StriateUa. 



Fi-ustulia. 



Syncyclia. 



Naunema. 



Gloeonema. 



Schizonema. 



Micromega. 



Acineta. 



