Sketch of the Infusori of the family Bacillaric 285 
shall merely refer to them by the numbers given to the figures 
representing them. I hope that these figures’will enable some of 
the learned students of this family in Europe to decide which 
species are new, and perhaps if this paper should meet the eyes 
of Ehrenberg, he may oblige us by furnishing for this Journal 
the authentic names of the species I have represented in the ac- 
companying plates. 
For what relates to the classification and synonymy of this 
family I am chiefly indebted to an abstract of Ehrenberg’s work 
on eee which is appended to Mandl’s Traité pratique du 
cope. The generic and specific characters which I give 
are in most cases literal translations from this work. I have 
also studied with much profit Kutzing’s Synopsis Diatomearum 
inthe Linnea for 1833. 'The plates accompanying Kutzing’s 
memoir have decided many doubts forme. Ehrenberg’s great 
work.on Infusoria I have not yet seen. 
Without further preface, Tshall eins — a translation of 
pa see? te e a age 3 
BACILLARIA. sis Shemitlce 
Sees 
“ Polygastric (distinctly or probably*) without intestinal canal ; 
appendices (distinctly or probably ) variable, undivided, body ard 
tiform ; carapace often prismatic and siliceous, with One or seve- 
ral openings, often having the form of articulated polypi doms, in 
consequence of imperfect, spontaneous (longitudinal) division. % 
Ehrenberg divides this family into the following groups, viz. 
Desmidiacea, having the carapace simple, free, and univalve, 
(not usually. siliceous.) 
Naviculacea, with the carapace simple, fre, with two or more 
valves, (siliceous. ) 
Echinellea, with the carapace simple, fixed, (siliceous. ) 
Miatotnais,. with the carapace double, ano, and enveloped 
in tubes or gelatine.) 
He separates the Closteria as a distinct family, but this genus 
isso closely allied to Euastrum, that I cannot hesitate to follow 
the example of most writers upon the eabjoetes and to class them 
with the Desmidiacez. 
fT gen a» the cornea of Ehrenberg i with regard to the 
SweeLie y OP 
