CONTAINING DIATOMACEOUS EXUVI.K. 



G7. 



Pinnular 



ia radiosa. 



105. 



Gomphonema dichotomum. 



68. 



i» 



oblonga. 



106. 



„ Fusticulus.t 



69. 



ii 



divergent. 



107. 



„ insigne.'j; 



70. 



H 



gibba. 



108. 



Meridion circulare. 



71. 



>j 



gracilis. 



109. 



„ constrictum. 



72. 



»> 



viridula. 



110. 



Achnanthes exilis. 



73. 



ii 



mesolepta. 



111. 



Achnantliidium lanceolatuin 



74. 



>> 



stauroneiformis. 



112. 



„ coarctatum, 



75. 





latestriata.* 





Breb. 



76. 



>» 



undnlata.* 



113 Himantidium majus. 



77. 



}> 



tenuis.* 



114. 



„ Arcus. 



78. 



>» 



parva.* 



115. 



„ pectinale. 



79. 



>> 



exigua.* 



116. 



„ gracile. 



80. 



Stauroncis Phoenicenteron. 



117. 



„ bidens. 



81. 



>? 



gracilis. 



118. 



Fragillaria capucina. 



82. 



jj 



anceps. 



119. 



„ virescens. 



83. 



j> 



dilatata. 



120. 



Odontidium mesodon. 



84. 



» 



punctata. 



121. 



„ mutabile. 



85. 



»? 



rectangularis.* 



122. 



„ Tabellaria. 



86. 



Pleurosi 



ima attcnuatum. 



123. 



„ Harrisoni.§ 



87. 



Syuedra 



Ulna. 



124. 



Denticula tenuis. 



88. 



' 



radians. 



125. 



„ sinuata. 



89. 



» 



pulchella. 



126. 



Tabellaria fenestrata. 



90. 



» 



obtusa. 



127. 



„ flocculosa. 



91. 



>j 



biceps. 



128. 



„ ventricosa. 



92. 



» 



lunaris. 



129. 



Diatoma vulgare. 



93. 



j> 



acicularis. 



130. 



„ elongatum. 



94. 



Cocconema lanceolatum. 



131. 



Melosira varians. 



95. 



» 



Cistula. 



132. 



Orthosira arenaria. 



96. 



u 



cymbifornie. 



133. 



„ nivalis. 



97. 



» 



gibbum. 



134. 



jMastogloia elliptica. 



98. 



Gomphonema geininatum. 



135. 



„ Dansei. 



99. 







acuminatum. 



136. 



Colletonema neglectum. 



100. 



JJ 



coronatum. 



137. 



„ vulgare. 



101. 



» 



curvatum. 



138. 



„ subnexile. 



102. 



J) 



constrictum. 



139. 



Encyonema prostratum. 



103. 



» 



capitatam. 



140. 



„ caespitosum. 



104. 



» 



tenellum. 







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 pachycepbala,!" Eabenhorst. 



210. „ (Navicula) Gastrum.** 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. 



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



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



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



