XVI. 



CONTENTS. 



Page 



434 



435 

 43 6 

 437 

 437 

 437 

 43 



Genus 103. Stephanopyxis Ehr., 1844, Char. Em. 



Cresswellia Grev. , 1857 (spines coronal). 



Trochosira Kitton, 1871 central processes or spines not numerous. 



Genus 104. Muelleriella H. Van Heurck, 1894 



Genus 105. Thalassiosira Cleve, 1892 



Genus 106. Skeletonema Grev., 1865 



Genus 107. Stephanogonia Ehr., 1844, Char. Em. 



Genus 108. Pantocsekia Grun., 1886 . 



Genus 109. Melosira Ac, 1824, Char. Em. 



Orthosira Thw. , 1848 frustule with puncta surface plane, dentate. 



Aulacosira Thw., 1848 joints cylindrical, bisulcate. 



Gaillonella Bory, 1823 valves carinate. 



Paralia Heib. , 1863 valve punctate and areolate. 



Liparogyra Ehr., 1844 valves with internal thickenings. 



Genus iio. Endyctia Ehr., 1845 .... 445 



Genus in. Cyclotella Ktz., 1833 . . 445 



Genus 112. Podosira Ehr., 1840 . . . 447 



Genus 113. Druridgea Donkin, 186 1 . . . . 448 



Genus 114. Hyalodiscus Ehr., 1854 .... 448 



Genus 115. Centroporus Pant., 1889 . . . 449 



Tribe XXI. Biddulphie/e. 

 I. Isthmiece. 

 Genus 116. Isthmia Agardh, 1830 . . . . 451 



II. HemiaulidecB. 

 Genus 117. Terpsinoe Ehr., 1843 .... 452 



Pleurodesmium Ktz., 1846 Frustules united by short processes, like 



feet. 

 Tetragranima Ehr., 1843 valve furnished with four costce. 



Genus 118. Hydro-sera Wallich, 1858 . . . 453 



Genus 119. Anaulus (Ehr., 1844) Char. Emend. . . 454 



Eunotogramma Weisse, 18154 valve lunate. 



Genus 120. Helminthopsis H. Van. Heurck, 1892 . . 455 



Genus 121. Hemiaulus (Ehr., 1844) H. L. Smith Em. . . 455 



Corinna Heib., 1863 valve cuneate, with two unequal processes. 

 Trinacria Heib., 1863 valve triangular, with three processes. 

 Solium Heib., 1863 valve quadrangular, with four processes. 



Genus 122. Ploiaria Pant., 1889 .... 457 



Genus 123. Graya Brun & Grove, 1892 . . . 458 



Genus 124. Pseudo-Rutilaria Grove & Sturt, 1886 . . 459 



Genus 125. Rutilariopsis H.V.H. 1894 . . 459 



Genus 126. Baxteria H.V.H. , 1893 .... 460 



III . Euca?npie<z. 

 Genus 127. Eucampia (Ehr., 1839) Char. Em. . . . 461 



Molleria Cleve, 1873 valve much excavated, apices prolonged into 

 horns. 



