LS. | 



i)l \ HiM \. | 



! 



doubtful creatun hat one division of them, Uie Cymb 



putrid ha vi a siliceous covering, and consequently their form i 

 ill, \ are not destroyed by fire. When in perfection tl 

 unfrcqu?utl) become greenish when dn ; thej llj ofcitl 



inutic form, and often marked «itli Btreaks and D 



rarv, putrifj very Blowly, have Dot a sUiceou 

 in ilr;. ing. \\ hen in perf< ction th< j are gi Derail) of an hi rl 

 most frequently have the fragments divided into i«" porl 



form, hut sometimes differing much as 1 j division is n . liuiu 



mucosum merelj by a shallovi groove passing round the joint, and in !>■ 

 b\ aotches in the angles, bj which if is rendered still more I -. whilst 



jtrum the two portions are connected onlj bj a central V. 11. 11. 



I In another place {lb. 13. 377) tl"> accurate observer 



ol starch among 1 1 1 » ■ Di Bmidiese, which, not I" ing an animal ; 

 Settle the question of the vegetable nature ofal Least that portion ol Brittlewi 

 of still waters, and oozy plao a in the northern parts of the world. 

 The Dses of thi Be plants to man are unknown. 



Suborder I. Cymi ■ I oeconema, Ehr. 



Individuals quite achnai I 

 .r, mIi- Btrlati 



ill, 



i 

 i \\\ ■. 



Hap a Ktz. 



I . Ktz. 



. VVaUr. 



I. Ii-lli, i; | 



KUtx. 

 ilphia, Cray. 

 > I ihoi i ma, 



Ktz. 

 / , Kts. 



Si I, . Ktz. 



1 unotla, Ehr. 



I>tlmii:i . 



Diatoma, 2 



I, I lir. 

 Tabeuaria, i. 

 Ua, Ehr. 

 Fragilaria, / 



1 tory. 

 Mum, W allr. 

 monema, Ag. 

 Ti tracyclu 

 1 Dium, /./;. 



Mf.'. \ 



B 

 i 

 Oncobyrsa, Ag. 



Buborder II. Hydroli- 

 NE.E. — Individuals en- 



GENEH \. 



• I in tul „ 

 gular. 



Encyonema, Kit. 

 Dickiea, I- 

 Hydrolinum, Link. 



Moru 



ill. 



Sj. i . i 



Homo Ig. 



Gloiodii ■ 

 Hydrurue, 



■ ray. 

 Micro: 

 I 



Xanthidium. 



. 

 Ilarv. 



Turp. 

 Odonti 



I 



M 



- 



ii. 

 ■ 



S 

 II, liactis, fit*. 



Suborder III Di s»n- & 

 i — Individuals <g 

 lindrical. 



tg. 



■ ■ . i i, / 

 , as. liE.s. 45. Sp. 167. 



Posi 



.1 



DiATOSUCEiE. I Be-Palmi 



/:■'//' 



3 thus described the i 

 inotia turgida, not very ua i in ditches, thi 



□ the De8midie8e, in the union of the endochrome of two appi 

 this mixed endochrome developing around itself ;\ proper i 

 miug converted int<> the Bporangium. In 



fruetules of the Eunotia have tl i 

 sition, and from each of these surfaces t\\.> protubi 

 ir ones in the opposite frustule: these protuberances im 

 of communication by which the endochrome of the two frustidi 

 well us the Bpot where is subsequently developed tl 

 the two sporangia. The mixed endochrome occurs al 

 between the connected fruatules, bul ti shortly bi 



100th r_\ hndrical membrane. Around the whole strui tui 

 of mil, -us is developed, l>y which thi empty frustuli 

 Bporongia. In < lomphonema and < 

 origin to two Bporangia, and around eaoh pair ol fr 

 firm mucus or gelatine, which gradually disappears a 



N 



Sphinctocj 



Sphterophora, 



ADDITION \' 



li.l cystis, .' 

 Trlgonocj Btis, 



alocystis, 

 lly- - 

 Didymoprium 



<; im i: v 



- 

 \ 

 i •. 





