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MICROSCOPIC PREPARATIONS OF THE DIATOMACEiE. 



Smith and Beck supply the following Diatomacese described in the Synopsis. 

 As each specimen has been examined by the author of that work, the au- 

 thority of these mountings may be relied upon by those desirous of correctly 

 identifying these interesting and beautiful objects. 



Diatomaceous Earths in Balsam. 



Peterhead Deposit. 

 Premnay Peat. 

 Dolgelly Earth. 

 Lough Mourne Deposit. 



Lough Island-Reavey Deposit. 

 Can tyre Peat. 

 Marl Co. Down. 



Diatomaceo: in Balsam, or mounted Dry. 



No. of 

 Species. 



2. 

 4. 



9. 

 11. 

 12. 

 13. 

 14. 

 15. 

 18. 

 23. 

 24. 

 2.5. 

 31. 

 32. 

 33. 

 34. 

 35. 

 37. 

 38. 

 40. 

 41. 



Epithemia turgida. 

 Epithemia Zebra. 

 Epithemia Argus. 

 Epithemia proboscidea. 

 Epithemia Sorex. 

 Epithemia Westermanii. 

 Epithemia rupestris. 

 Epithemia gibba. 

 Epithemia ventricosa. 

 Eunotia A reus. 

 Eunotia triodon. 

 Cymbella maculata. 

 Cymbella Helvetica. 

 Cymbella Scotica. 

 Cocconeis Pediculus. 

 Cocconeis Placeutula. 

 Cocconeis Thwaitesii. 

 Cocconeis Scutellum. 

 Cocconeis Grevillii. 

 Coscinodiscus radiatus. 

 Coscinodiscus eccentricus. 

 Eupodiscus fulvus. 

 Eupodiscus crassus. 



No. of 

 Species. 



45. Triceratium alternans. 

 47. Cyclotella KUtzingiana. 

 50. Cyclotella Rotula. 

 57. Surirella biseriata. 

 59. Surirella constricta. 

 62. Surirella splendida. 



64. Surirella striatula. 



65. Surirella Gemma. 

 68. Surirella oralis. 



70. Surirella ovata. 



71. Surirella salina. 



7^. Tryblionella gracilis. 



7^. Tryblionella marginata. 



77. Tryblionella acuminata. 



78. Cymatopleura Solea. 



80. Cymatopleura elliptica. 



81. Cymatopleura Hibernica. 



82. Synedra lunaris. 



83. Synedra biceps. 



84. Synedra pulchella. 



89. Synedra radians. 



90. Synedra Ulna. 

 96. Synedra tabulata. 



