Bacillaria.] 



THE INFUSORIA. 



177 



The Bacillaria comprehend the following genera : — 



/ prism 

 shaped 



f. 



'three-sided, 

 four-sided .. 

 , five-sided .. 



X' One 



valved. . 

 {Desmi- (^ 

 diacea). 



(smooth 



I clusters 

 ( do. ben 



clusters monilifoim 

 berry-Uke , 



spinous 



r 



K flat 



/ round 



( compressed or lying together 

 (united by serritures 



Two or 



more 



valved. 



. (Navicu. 



\ lacea). 



plate or disc-like . 



spherical, simple ., 



forming coral-like 

 clusters 



self-division complete, 

 never band-like 



^prismatic( 



(many in each plate or disc 

 two ditto 

 single and disc-like 



t l-celled,articulated filiform 

 ( many celled, concentrically 



(six openings to lorica ... 

 four ditto 

 one ditto 



(^ wand-like 



division iwcomplete, 



foi-ming band-like 



clusters 



jointed 



( plate-like 



jointlessf''^"'J^^""'''S^* 

 ^ ° ' [ bands spiral ... 



/ single individuals broader than long , 



formed as a wand (prism-shaped) 

 formed as a wedge 



stalkless, 

 sessile 



, , , ( dichotomous by long. div. 



vedged-shaped I 



( whorledor radiatingby do. 



banner-like, 

 attachment oblique 



■ Covered with an amor- 

 phous mass of gelatine ... '^ 



Covered witli membranous 

 or gelatinous tubes .. 



lance-shaped, attachment direct 



a central opening . 



no central opening., 



scattered 



connected in a ring-like manner 



spiculi straight 



' tubes simply branched 



ditto aggi-egated, 

 bundle-like 



ditto crooked 



slit Hke a bunch 



branched like a tree 



Appended group. — Lorica simple, singly stalked, soft-valved, with manyretj-actile 1 

 (not vibratile] Tentaculae 1 



N 



Desmidium. 

 Staurastrum. 

 Pentasterias. 

 Tessararthra. 

 Sphaerastrum. 

 Xanthidium, 

 Arthrodesmus. 

 Odontella. 

 Micrasterias. 

 Euastrum. 

 Microtheca. 

 PjTcidicula. 

 Gallionella. 

 Actinocyclus. 

 Navicula. 

 Eunotia. 

 Cocconeis. 

 Bacillaria. 

 Tessella. 

 Fragilaria. 

 Meridion. 

 Isthmia. 

 Synedra. 

 Podosphenia. 

 Gomphonema. 

 Echinella. 



Cocconema. 



Achuanthes. 



StriateUa. 



Fnrstulia. 



Syncyclia. 



Naunema. 



Gloeonema. 



Schizonema. 



Micromega. 



Acineta. 



