CONTAINING DIATOMACEOUS EXUVIAE. 



37 



G7. Pinnularia radiosa. 



68. ,, oblonga. 



69. ,, divergens. 



70. „ gibba. 



71. ,, gracilis. 



72. ,, viridula. 



73. ,, mesolepta. 



74. ,, staiironeiformis. 



75. „ latestriata.* 



76. ,, uudulata.* 



77. ,, tenuis.* 



78. „ parva.* 



79. ,, exigua.* 



80. Stauroneis Phoeniceuteron. 



81. „ gracilis. 



82. „ anceps. 



83. „ dilatata. 



84. „ punctata. 



85. „ rectangularis.* 



86. Pleurosigma attenuatum. 



87. Synedra Ulna. 



88. „ radians. 



89. „ pulchella. 



90. „ obtusa. 



91. „ biceps. 



92. „ lunaris. 



93. „ acicularis. 



94. Cocconema lanceolatum. 



95. „ Cistula. . 



96. „ cymbiforme. 



97. „ gibbum. 



98. Gomphonema geminatum. 



99. „ acuminatum. 



100. „ coronatum. 



101. „ curvatum. 



102. „ constrictum. 



103. „ capitatum. 



104. „ tenelluni. ! 



Total, 140 fresh- water species, which, added to 67 marine 

 forms, gives a grand total of 207 species, known as British. 



To these must be added a few which have now, for the first 

 time, occurred in this country, though known on the Continent. 

 Such are — 



208. Navicula nodosa,|| Kiitzing. 



209. Pinnularia pacliycephala,Tr Eabenhorst. 



210. „ (Navicula) Gastr urn.** Ehr. 



* These six species are figured in my account of the Mull deposit. 



t This species has lately been distinguished by Mr. Smith. 



X A new species, which I shall describe and figure in the next number 

 of the ' Journal,' along with several other recent forms, which I have 

 observed during the past year. 



§ A beautiful form, lately detected by Mr. Harrison. 



II To be figured in the next number of the ' Journal.' 



TT Occurs also in the Mull deposit, and will be figured in next number. 

 ** This form is figured in the present paper. See fig. 20. 



105. Gomphonema dichotomum. 



106. „ Fusticulus.t 



107. „ insigne.$ 



108. Meridion circulare. 



109. „ constrictum. 



110. Achnanthes exilis 



111. Achnanthidium lanceolatum. 



112. „ coarctatum, 

 Breb. 



113 Himantidium majus. 



114. „ Arcus. 



115. „ pectinale. 



116. „ gracile. 



117. „ bidens. 



118. Fragillaria capucina. 



119. „ virescens. 



120. Odontidium mesodon. 



121. „ mutabile. 



122. „ Tabellaria. 



123. „ Harrisoni.§ 



124. Denticula tenuis. 



125. „ sinuata. 



126. Tabellaria fenestrata. 



127. „ flocculosa. 



128. „ ventricosa. 



129. Diatom a vulgare. 



130. „ elongatum. 



131. Melosira varians. 



132. Orthosira arenaria. 



133. „ nivalis. 



134. Mastogloia elliptica. 



135. „ Dansei. 



136. Colletonema neglectum. 



137. „ vulgare. 



138. „ subflexile. 



139. Encyonema prostratum. 



140. „ CEBspitosum. 



