SCOTTISH ROTIFERS, COLLECTED BY THE LAKE SURVEY. 



199 



Rotifers of North Uist. 



The Rotifers enumerated in the following short list were collected in the early 

 summer of 1904, while the lochs of the island were being surveyed. As the whole 

 district surveyed is one great wet moor, most of the Rotifers were got from bog or moor 

 mosses, chiefly Sphagytum and Hypnum of various species. 



One interesting collection was made from a tuft of Fontinalis growing in a mill- 

 stream, within reach of the tides, so that the animals living in the axils of the leaves 

 must be able to endure alternately fresh and salt water. The species found here were 

 Philodina fiaviceps, and all four species of Euchlanis on the list. P. Jlaviceps has 

 since been found actually in the sea, by Mr Wm. Evans. 



Philodina rugosa, Bryce. 



,, nemoralis, Bryce. 



,, jlaviceps, Bryce. 



„ macrostyla, Ehr., and variety tuberculata 

 (Gosse). 

 Callidina aspera, Bryce. 



„ lata, Bryce. 



,, angusticollis, Murray. 



„ sijmbiotica, Zel. 



„ tetraodon, Ehr. 



„ russeola, Zel. 



„ plicata, Bryce, and variety Idrundinella. 



„ papillosa, Thompson. 



,, multispinosa, Thompson. 



,, quadricornifera, Milne. 

 Rotifer tardus, Ehr. 



,, macrurus, Schrank. 

 ,, citrinus, Ehr. 

 Adineta vaga, Davis. 



Adineta barbata, Janson. 

 Ascomorpha ecaudis, Perty. 

 Microcodon claims, Ehr. 

 Copeus cerberus, Gosse. 

 Proales petromyzon, Ehr. 

 Furcularia longiseta, Ehr. 

 Rattulus longiseta, Schrank. 

 Diurella tigris, Miill. 

 Diaschiza gibba, Ehr. 

 Dinocharis tetractis, Ehr. 

 Stephanops muticus, Ehr. 

 Euchlanis lyra, Huds. 



,, oropha, Gosse. 



„ deflexa, Gosse. 



,, triquetra, Ehr. 

 Monostyla lunaris, Ehr. 



„ cornuta, Ehr. 

 Colurus obtusus, Gosse. 

 Anurxa serrulata, Ehr. 



Rotifer a of Orkney and Shetland. 



As I am aware of no published account of the Rotifers of these islands, a list of some 

 of those found by the Lake Survey is here given, though there is nothing of special 

 interest in the list. We found several species which are very local in their distribution, 

 some of them only previously known from one or two spots on the mainland of 

 Scotland. Though the majority of Rotifers are considered to be cosmopolitan in their 

 distribution, the same species appearing under similar conditions everywhere, the portion 

 of the earth's surface which has been carefully examined is too limited to permit us to 

 suppose that this is demonstrated, and so local lists have their uses. 



Arthroglena lutkeni, Berg., occurred in Orkney, and Brachionus bakeri, Ehr., in 

 Shetland, both for the first time in my experience. The lists from Orkney and Shetland 

 are given in parallel columns, though the information thus given is of little value, owing 

 to the inadequacy of the work done. As usual, the great majority of the species found 

 are Bdelloids. Forty-four species and three varieties are noted for Shetland, thirty-two 



