190 MR JAMES MURRAY ON 



species with the antenna partly retracted. Gosse was evidently aware of the close 

 affinity of the two species, as his description aims at discriminating them. 



Synchmta grandis, Zach. Castle Semple Loch, Kenfrew. 



S. oblonga, Ehr. Frequent in small lochs and reservoirs. 



Diaschiza era, Gosse. Loch Ness. 



Brachionus urceolaris, Ehr. Lochrutton, Dumfries. 



B. angularis, Gosse. Several small lochs near Dumfries. 



B. pala, Ehr., var. dorcas (Gosse). Hogganfield Loch, near Glasgow. 



Rotifers found in Ponds and Ditches. 



This short list is not a complete account of the Rotifers collected by the Lake Survey 

 in ponds, but only of those pond species which did not also occur in lakes. A 

 large number of species were got in ponds, including the majority of the species 

 recorded for the Scottish lochs. Callidina natans, a pond species, has already been 

 recorded (6). 



Floscularia cornuta, d'Ud. Bog pool on Blantyre Moor, near Glasgow. 



Philodina convergens, sp. n. (Plate I. figs. 1 to 3). 



Specific characters. — Of moderate size ; diameter of corona equal to or slightly 

 exceeding first cervical segment ; collar prominent, dorsal folds ending below summit 

 of upper lip ; sulcus between discs narrow, bottom convex, central setae on discs. Rami 

 much constricted at teeth, with prominent spine behind ; teeth 2/2. Antenna short. 

 Foot four-jointed. Spurs moderately long, with straight interstice, expanded at base ; 

 upper part almost parallel-sided, abruptly acute. Dorsal toes much smaller than 

 ventral. 



Length, feeding, 240 to 280 /x ; creeping, 333 m. Colour reddish. Trunk closely 

 longitudinally plicate. Diameter of corona, 50 m ; jaw, 25 m long ; spurs, 22 to 25 m 

 long. The rostrum is short, and no long tactile setae were seen. Length of antenna 

 equal to half the diameter of the first cervical segment. 



Pale brown eyes. Stomach walls with yellow globules. 



Habitat. — In washing of moss from the river Lochy, Killin, January 1906; 

 quarry at Nerston, East Kilbride, February 1906. 



In both localities the washing contained many Gammarus, and Gammarus 

 parasites (at Killin Phil, hamata, at Nerston P. laticeps), so there is at least a 

 suggestion that this is also a parasite. The corona is usually carried with the discs 

 approximated as in P. laticornis, but can be pretty widely extended. 



The points which distinguish this from other Philodime may seem rather slight, 

 but close attention to them will show that it is quite distinct. The spurs, though 

 narrow, are of the same form as in P. laticeps, etc., that is, blade-shaped. All the 



