SacUlayia.l 



INFUSORI.VL ANIMALCULES. 



221 



The fm-tlicT distribution of the genera, by Ehi-enberg, will be seen in 

 the fbUowing table ; — 



One 



valved. 

 {Desiiii- 

 diacea). 



prism 



globulai 



smooth . 



flat 



Two or 



more 



valved. < 



Navicii- 



lacea. 



. prismatic < 



r three-sided Desmidium. 



four-sided Staurastnim. 



five-sided Pentasterias. 



clusters moniliform Tessararthra. 



do. herry-like Sphaerastrum. 



spinous Xanthidium. 



/ compressed or lying to- 

 band-like I ^•5*^^'' Arthrodcsmus. 



' united by serritures Odoutella. 



f many in each plate or disc. . Micrasteiias. 



plate or disc-like. ... •^ two ditto Euastrum. 



Lsing-le and disc-like Microthcca. 



r spherical, simple Pyxidicula. 



I 1 -celled, articulated filiform Gallionella. 



( many celled, concentrically Actiuocyclus. 



six openings to lorica . . Navicula. 



four ditto Eunotia. 



one ditto Coeconeis. 



^ waud-like Bacillaria. 



forming coral-like 

 clusters 



self-division complete 

 never band-like 



division incomplete, 



forming-band-like < 



clusters 



joiuted 



( plate-like Tessella. 





jointless f ^™'^® straight . . Fragilaria. 



(fragilej (bands spiral Meridion. 



single individuals broader than long , Isthmia. 



formed as a wand (prism-shaped) Syuedra. 



formed as a wedge Podosphenia. 



^1 



O J3 



stalkless, 

 sessile 



stalked ■< 



Covered with an amorphous 

 mass of gelatine 



'°< 



Covered with membranous or J 

 gelatinous tubes \ 



1 dichotomous by long. div. . Gomphonema. 



wedge-shaped ' 



( whorled or radiating by do. Echinella. 



lance-shaped, attachment dii-ect , Cocconema. 



banner-like ( ^ central opeiiiiig Achnauthes, 



attachment oblique ) ' . , • ^.^ • . ,, 



L ^ ^ no central opening Stnatclla. 



scattered FrustuUa. 



connected in a ring-like manner Syncyclia. 



rspiculi straight Nauuema. 



C tubes simply branched-< 



ditto aRgrcsatcd, 

 bundJe-like 



, ditto crooked Gloconeina. 



f slit like a bimch .Schizoncma. 



Ibranched like a tree Micromcga. 



