CONTENTS. 



CHAPTER III. 



Bibliography ..... 



General Bibliography .... 



Collections of Diatoms .... 

 Collections used for this Work 

 Special Bibliography of the British Isles 



Table of Names of Authors and Collectors cited 



Unit of Measurement .... 



DESCRIPTION OF GENERA AND SPECIES. 



Sub-Family I. Raphidie^ .125 



Tribe I. Cym belled . . . . 125 



Genus 1. Amphora Ehr., 1831 . . . -125 



Okedenia Eul. in litt = Amphora inflcxa H. L. Sm. 



Genus 2. Cvmbella Ac, 1830, Char. Em. . . . 140 



Cymbella Ag. . 1830 frustules free. 

 Cocconenia Ehr., 1829 fruslules stipitate. 

 Syncyclia Ehr., 1835 frustules arranged in a circle. 



Genus 3. Encyonema (Ktz., 1833), H.V.H. Emend, 1885 . 148 



Tribe II. Navicule^; . . -152 



Genus 4. Mastogloia Thwaites, 1848, Char. Em. . . 153 



Genus 4a. Stigmophora Wallich, i860 . . -156 



Genus 5. Dictyoneis Cleve, 1890 . . . . 157 



Genus 6. Stauroneis Ehr., 1843, Char. Em. . . . 158 



Staurogramma Rab. , 1853 valves with decussating striae. 

 Staurosigma Grun., i860 valves with sigmoid raphe. 

 Pleurostauron Rab., 1859 frustules cohering in filament. 

 Endostauron Grun. , 1868 frustules enclosed in mucous tubes. 



Genus 7. Navicula Bory, 1822 .... 162 



Alloieneis Schum., 1867 striae of unequal length on the two sides of 



the valve. 

 Anomneoneis Pfitz. , 1871 corresponding with the group Sadptece 



of this work. 

 Caloneis Cleve, 1891 valves indistinctly punctate, with striae crossed 



by longitudinal lines. 

 Craticula Grun., 1868 valves anomalous, showing transverse costae. 

 Diadesmis Ktz., 1844 Navicula united in long bands. 

 Dickieia Berk., 1844 scattered frustules in a plane frond 

 Diploneis Ehr., 1840 valves constricted at the median portion. 

 Falcatella Rab., 1853 a medley of forms with arcuate valves. 

 Libellus Cleve, 1873 frustules with connective membrane showing 



numerous plicae. 

 Neidium Pfitzer, 1871 corresponding with the group Affines of this 



work. 

 Pinnularia Ehr., 1840 valves with beads confluent into costae and 



consequently showing continuous striae in the form of canililuli. 

 Rhaphidodiscus Th. Christian, 1887 genus founded either on the 



accidental superposition of a Navicula and Melosira or on 



certain disciform Navicula. 

 Schizonema Ag., 1824 Navicula enclosed in mucous tubes. 

 Schizostauron Grun., 1867 Navicula furnished with a pseudo- 



stauros, bifurcated in the form of a St. Andrew's Cross. 

 Stauroptera Ehr., 1843 Navicula having a pseudo-stauros. 

 Stictodesmis Grun., 1863, and Perizonium Cohn and John, 1862 



Navicula with craticular transverse costae. 

 Trachyneis Cleve, 1893 corresponding with the group Aspereceol this 



work. 

 ? Cyclophora Castr. , 1878 valve having a median (craticular?) 



annulus. 



