274 



Part III. — Ninth Annual Report 



PEOTOZOA. 



Rhizopoda were common all over the loch. Several forms were obtained 

 in the dredged and hand-netted material ; the following are the more 

 typical varieties observed : — 



Difflugia piriformis. This form varies from pear to balloon shape, but 

 the pear shape is usually the more common. 



Difflugia globularis. — The test is more or less globular, J to -J- being 

 truncate and forming the aperture ; this form was much less frequent than 

 the last. 



Difflugia corona. — Test crown shaped, furnished posteriorly with few 

 or more comua. This appeared to be a scarce form. 



Difflugia marsupiformis. — Test from the side view varies a good deal, 

 but the most common form was that of a slightly eccentric and depressed 

 hemisphere. The aperture is not central, but is situated more to one side, so 

 that its outer margin is usually close to the edge of the test, while the inner 

 margin is some distance from the opposite edge. This form of Difflugia 

 was of frequent occurrence. 



DIATOMACEA. 



Diatomacea were abundant, especially in the deeper parts of the loch, and 

 included a considerable number of species. J. Rae, M.D., and Mr 

 Robert Kidston, F.R.S.E., F.G.S., have kindly furnished me with the 

 following list of species : — 



Amphora ovalis, Kiitz. 

 Asterionella formosa, Hassal. 

 Cymbella cymbiformis, Ehr. 

 ,, anglica, Lagenstedt. 

 ,, cistula, Hempr. 

 Cyclotella operculata, var. mesoleia, Grim. 

 Ceratoneis arcus, Kiitz. 

 Campy lodiscus costatus, W. Sin. 

 Cocconeis scutellum, Ehr. 

 ,, pediculus, Ehr. 

 Cymatopleura solea (Breb.), W. Sm. 

 Diatoma vulgare, Borq. 



,, tenue, Kiitz. 

 Epithemia turgida (Ehr. ), Kiitz. 



,, sorex, Kiitz. 

 Encyonema ccespitosum, Kiitz. 

 Fragilaria vircscens, var. (?) exigua,Grxm. 

 ,, construens, var. binodis, Grim. 



,, mutabilis, (W. Sm.), Grim. 

 Gomphonema {acuminata var.), Brcbis- 



sonii, Kiitz. 

 Gomphonema intricatum, Kiitz. 



,, olivaceum, Ehr. 



Meridion circulare, Ag. 



Melosira orichalcea, W. Sm. 



., varians, Ag. 

 Navicula Smithii, Breb. 



,, radiosa, Kiitz. 



,, ,, var. acuta, Kiitz. 



,, gastrum (Ehr. ), Doukin. 



,, viridula, Kiitz. 



,, mesolepta, Ehr. 



,, limosa, Kiitz. 



,, gibba, Ehr. 



,, pusilla, Sm. 



,, Reinhardti, Grim, 

 sp. 

 Nitzschia sigmoidea (Ehr. ), "W. Sm. 



,, thermalis (Kiitz), Grim. 

 Pleurosigma ammdnatuwi (Kiitz), Grim. 



,, Sp>enscrii, W. Sm. 



Stauroneis anceps, Ehr. 

 Surirclla linearis, W. Sm. 



,, biseriata, Breb. 



,, ovalis, Breb. 

 Tabellaria flocculosa, (Roth.), Kiitz. 

 Tryblionella angustata, W. Sm. 



,, ,, var. curta, Grim. 



2. Raith Lake, Camilla Loch, and Lochgelly Loch in the 



County of Fife. 



These lochs were visited during the month of August, and were exam- 

 ined by hand-net from the shore. 



