SOME SCOTTISH ROTIFERS 165 



./?. guadrioculatus, Murray. Unlike most species of the genus, the 

 greatest thickness is found in the central segments. The foot 

 is short, but of the usual five segments. The eyes are in two 

 pairs, the lower further apart. Sometimes there are a few red 

 granules scattered between the two eyes of the same side. 

 Not common, Blantyre Moor, Fort Augustus. 



Callidina spinosa, Bryce. A four-toed species having the closest 

 affinity with PJiilodina aculeata. Rare, Fort Augustus. 



C. alpiuin, Ehr. This has four toes and a series of transverse ventral 

 folds on the trunk. Frequent, Killin, Mallaig, Inverness. 



C. Brycei, Weber. Very near the last, distinguished chiefly by a 

 row of transverse dorsal spines. Common, Blantyre Moor, 

 Ben Nevis, Mallaig. 



C. plena, Bryce. Found by Mr. Bryce in material sent from 

 Mallaig. Like the preceding species, it has four toes. 



C. plicata, Bryce. Very common both in bogs and in washings of 

 dry moss, Nutberry Hill, Lochinver, Inverness. 



C. qnadricornifera, Milne. Common, Blantyre Moor, Inverness. 

 C. papillosa, Thompson. Frequent, East Kilbride, Inverness. 



C. multispinosa, Thompson. Rare. Found by Mr. Bryce in 

 sediment from a pond on the summit of Nutberry Hill. 



C. ornata, Murray. Rare, Blantyre Moor. 



C. aspera, Bryce. Rare, Fort Augustus. 



C. asellicola, Bryce, MS. Parasitic on Asellus. Inverness-shire. 



C. magnicalcarata, Parsons. Parasitic on Asellus. This species 

 and C. asellicola resemble the genus Rotifer in the long many- 

 jointed foot and conspicuous toes. Inverness-shire. 



C. symbiotica, Zelinka. Frequent in moss washings, Inverness. 

 C. russeola, Zelinka. Frequent, Mallaig, Fort Augustus. 



C. scarlatina, Ehr. In pitchers of Frullania, not common, Killin, 

 East Kilbride, Fort Augustus. 



C. leitgebii\ Zelinka. Rare, Fort Augustus. 



C. tetraodon, Ehr. I find this the commonest of the symbiotic 

 species, and like the others it is not confined to the pitchers 

 of Frullania, but is found in many other situations. Inverness- 

 shire. 



C. elegans, Ehr. The type of that numerous group of species which 

 mould the food into pellets. Frequent, Inverness-shire. 



C. lata, Bryce. Very common, and generally distributed in different 

 situations, but most common in bogs, Blantyre Moor, Fort 

 Augustus. 



