Dr. Greville on some British Diatomacese. 



253 



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

 Glen Callater and Glen Tilt. The gatherings were subsequently 

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

 report upon 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. 



Epithemia turgida (Ehr.). 



alpestris, W. Sm. 



rupestris, W. Sm. 



gibba {Ehr.). 



Eunotia Arcus (Ehr.). 



incisa, Greg. 



— — gracilis, W. Sm. 



monodon, Ehr. 



diodon, Ehr., three forms. 



• Camelus, Ehr. 



triodon, Ehr., two fonns. 



tridentula, Ehr. 



• tetraodon, Ehr. 



quaternaria, Ehr. 



C3'^mbella cuspidata, Kiitz. 



affinis, Kiitz. 



ventricosa, Kiitz. 



Scotica, W. Sm. 



Helvetica, Kiitz. 



lunata, W. Sm., nov. sp. 



eequalis, W. Sm., nov. sp. 



Amphora ovalis, Kiitz. 

 Cocconeis Pediculus, Ehr. 

 Cyclotella operculata, Kiitz. 

 Surirella linearis, W. Sm. 



biseriata, Breb. 



Cymatopleura Solea {Kiitz.). 

 Navicula cocconeiformis, Greg., 



nov. sp. 

 - rhomboides, Ehr. 



crassinervia, Breb. 



• serians, Kiitz. 



firma, Kiitz. 



ovalis, W. Sm. 



angustata, W. Sm. 



gibberula, Kiitz. 



cryptocephala, Kiitz. 



Pinnularia major {Kiitz.). 



viridis {Ehr.). 



hemiptera, Breb. 



acuminata, W. Sm. 



lata {Breb.). 



alpina, ^T. Sm. 



late-striata, Greg. 



radiosa {Kiitz.). 



acuta, W. Sm. 



tenuis, Greg. 



divergens, W. Sm. 



stauroneiformis, fV. Sm. 



Stauroneis Phoenicenteron {Ehr.). 



gracilis, Ehr. 



aneeps, Ehr. 



Synedra lunaris, Ehr. 



radians, W. Sm., with vars. ^. 



and y. 

 Cocconema lanceolatum, Ehr. 



cymbiforme, Ehr. 



Cistula, Ehr. 



Gomphonema acuminatum, Ehr., 



with var. y. 



dichotomum, Kiitz. 



tenellum, W. Sm. 



capitatum, Ehr., with var. /3. 



olivaceum {Lyngb.). 



intricatum, Kiitz. 



Meridion circulare, Ag. 



constrictum, Ralfs. 



Himantidiura Arcus, Ehr. 



majus, W. Sm. 



pectinale {Dilhv.). 



undulatum, W. Sm. 



Odontidium hyemale {Lyngb.). 



mesodon {Ehr.). 



anomalum, W. Sm., nov. sp. 



