Dr. Grcville on some British Diatomacese. 



253 



corners of Ben-na-Muic-Dhui, down to the valleys of the Dee, 

 Glen Callater and Glen Tdt. The gatherings were subsequently 

 placed in my hands, with a request that I would examine and 

 report u])oii them to the Botanical Society. I have accordingly 

 submitted the collections to a patient investigation, and in now 

 presenting my account of them, I have to acknowledge the kind 

 assistance of the Rev. William Smith, Professor of Natural 

 History in the Cork College, to whom I referred the new and 

 dubious forms as the individual most competent to give an 

 authoritative decision in such cases. 



The following is a general list of the species collected, which, 

 although not so extensive as might have been anticipated, is 

 rich in rare and interesting forms. The new species, and those 

 recently or for the first time added to the British flora, are printed 

 in italics. 



Epithcmia tur^ida (Ehr.). 



al))estris, W. Sm. 



rupestris, IV. Sm. 



gibba (Ehr.). 



Eunotia Arcus (Ehr.). 



incisa. Grey. 



gracilis, JV. Sm. 



monodon, Ehr. 



diodon, Ehr., three forms. 



Camelus, Ehr. 



triodon, Ehr., two forms. 



tridenttda, Ehr. 



■ tetraodon, Ehr. 



quaternaria, Ehr. 



Cymbella cuspidata, Kiitz. 



affiuis, Kiitz. 



— — ventricosa, Kiitz. 



Scotica, W. Sm. 



Helvetica, Kiitz. 



lunata, W. Sm., nov. sp. 



cequalis, W. Sm., uov. sp. 



Amphora ovalis, Kiitz. 

 Cocconeis Pediculus, Ehr. 

 Cyclotella operculata, Kiitz. 

 Surirella linearis, IV. Sm. 



biseriata, Breb. 



Cymatopleura Solea {Kiitz.). 

 Navicula cocconeiformis, Greg., 

 nov. sp. 



rhomboides, Ehr. 



crassiuervia, Breb. 



serians, Kiitz. 



firma, Kiifz. 



ovalis, IV. Sm. 



angustata, W. Sm. 



gibberula, Kiitz. 



cryptocephala, Kiitz. 



Pinnularia major (Kiitz.). 



viridis {Ehr.). 



• hemiptera, Breb. 



acuminata, W. Sm. 



lata {Breb.). 



alpina, W. Sm. 



late-striata, Greg. 



radiosa {Kiitz.). 



acuta, W. Sm. 



tenuis, Greg. 



divergens, W. Sm. 



stauroneiformis, H^. Sm. 



Stauroneis Phoenicenteron {Ehr.). 



■ gracilis, Ehr. 



anceps, Ehr. 



Synedra luuaris, Ehr. 



radians, JV. Sm., with vars. ^. 



and y. 

 Cocconema lanceolatum, Ehr. 



cymbiforme, Ehr. 



Cistula, Ehr. 



Gomphonema acuminatum, Ehr., 



with var. y. 



dichotomum, Kiitz. 



■ tenellum, JV. Sm. 



capitatum, Ehr., with var. ^. 



olivaceum {Lyiigb.). 



• intricatum, Kiitz. 



Meridion circulare, j^g. 



constrictum, Ralfs. 



Himantidium Arcus, Ehr. 



majus, JV. Sm. 



pectinale {Dilliv.). 



undulatum, JV. Sm. 



Odontidium hyemale {Lyngb.). 



mesodou {Ehr.). 



anomalnm, W. Sm., nov. sp. 



