Kavictilacea.'] infusoeial animalcules. 323 



Kiitzing says : " The connected band of frustules (lorieaj) is attached 

 by an elongated, but inconspicuous stulli." Length 1 -570th to 

 1 -430th. 



Bacill-Iria pect mail's = Liatoma temie (Ag.) — Slender, striated; 

 often thi'ee to six times longer than broad ; of a brownish yellow 

 colour; striae nine in l-1200th. Kiitzing aiflrms that the chain is 

 affixed by an indistinct stalk. Length 1 -3240th to 1 -430th. In 

 fresh and stdt water. 



B. elongata = Biatoma Ehrenbergii (Kiitz.) — Striated, slender, 

 slightly contracted in the middle (P. 3, f. 169.) Striae twelve in 

 l-1200th. Chain fixed by a very minute stalk (Kiitz.) Length 

 1- 1150th to 1 -240th. In ponds, common. 



B. cuneata. — -"Wedge-shaped (cuneate), striated (fig. 170), margin 

 with a few teeth ; length not double the width ; lateral view ventri- 

 cosc, lanceolate. It approaches near Odontidium mesodon (Kiitz.) 

 Length l-1150th to l-1200th. Fresh water. 



B. Cleopatra = Grammatophora tnarina (Kiitz.) — Oblong, destitute 

 of striae ; colour golden yellow. "Was found by Ehrenberg near the 

 ruins of the Baths of Cleopatra, in Egypt. Length 1-5 70th to 1 -480th. 



B. (?) tabellaris =^ Tahellaria flocculosa (Kiitz.) — Smooth, narrow, 

 slightly enlarged at the middle ; frustules occuring in the form of 

 square plates; granular contents yellowish. Length 1-1 150th to 

 l-960th. In fresh water on Conferva. 



B. flocculosa. — Smooth, almost square, not enlarged at the middle. 

 In ponds and streams. Length 1- 1440th. 



This, and the two following species, Kiitzing considers to be repre- 

 sented by his Biatoma pectinale. The lateral \'iew he describes to be 

 sharply lanceolate. 



B. seriata. — Slender, straight, eight to nine times longer than 

 broad ; smooth ; the contained granules occur in four to five masses. 

 Length 1 -360th. In slow streams and ponds on Conferva. 



B. Ptolomai. — Smooth, very small, length t"\vice or thrice the 

 breadth. Colour pale. Found in Alexondi-ia. Length ] -3600th. 



As a member of this genus, Niigeli describes the following 

 organism ; — 



Each cell or segment has the form of a column, the bases of 

 which are cUipses. The axis is rather shorter than the long 



