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Genus 84.<br />

CONTENTS. XV.<br />

Sub-Family III. Crypto- Raphidie/e<br />

Tribe XIX. Chtetocere.e<br />

I. (a) Rhizosoleniece.<br />

Rhizosolenia (Ehr. Brightwell) Per. Em. 1892<br />

Henseniella Schutt, 1893 frustules flexed.<br />

(b) Dactyliosolencce.<br />

.Genus 85. Dactyliosolen (Castr., 1886) Char. Em. Perag., 1892<br />

Genus 86. Guinardia H. Perag., 1892<br />

Genus 87. Lauderia Cleve, 1873<br />

Dotonula Schutt, 1893 spines absent on the surface of the disc.<br />

-<br />

Genus 87^ Peragalloa Schuti , 1895.<br />

(t) Altheyea.<br />

Genus 88. Attheya West, i860<br />

1 1 .<br />

Eu- C/iietocerece.<br />

Genus 89. Ch/Etoceros Ehr. (1844) Char. Em..<br />

Genus<br />

95.<br />

Chcetoceros Auct. valves with awns not arranged in a circle on the<br />

margin of the valves.<br />

Bacteriastrum Shadb. , i860 valves plane, bearing a circlet of horizo<br />

ital awns<br />

Corethron Castr., 1886 valves convex, furnished with a corona of<br />

erect spines<br />

Ditylum Bailey, 1861<br />

Syndetoneis Grun., 1888 .<br />

Pyrgodiscus Kitton, 1885.<br />

Dicladia Ehr., 1844 (spore of chcetoceros ?).<br />

Thaumatonema Grew, 1863.<br />

Syringidium Ehr., 1845<br />

Syndendrium Ehr., 1845 (spore of chcetoceros?).<br />

Hercotheca Ehr., 1S44<br />

.<br />

Goniothecium Ehr., 1844 .<br />

Tribe XX. Melosire^e<br />

Page<br />

. 410<br />

. 412<br />

4i3<br />

416<br />

4i7<br />

418<br />

419<br />

420<br />

420

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