Canadian Rotifer a. By J. Murray. 291 



and second segments of trunk at each side, two ligular rounded pro- 

 cesses ; on central trunk at each side, one similar sublateral 

 process at broadest part ; conical processes at posterior angles of 

 central trunk and on rump ; on the foot, a curved lateral seta with 

 bulbose base. No transverse dorsal series. 



This variety is peculiar in having only ligular processes in 

 front of the widest part of the body. 



All these varieties figured occurred together near the Lake of 

 the Woods, and the intermediate forms are too numerous to figure. 



Callidina zickendrahti Eichters. Plate VII. figs. 10a, 10&. i 



Sufficiently near Eichters' type, yet with some differences. 

 There is the same number (five pairs) of ligular processes, mostly 

 forked at the ends. In the figure several appear broken off. They 

 are not all in the same positions. The pair on the central trunk 

 form part of the dorsal transverse series. There is a long seta on 

 the second trunk segment. Teeth 2. 



Examples from Russia, which I have been enabled by the kind- 

 ness of Dr. Penard to see, differ more from Eichters' type, having 

 the dorsal transverse series of large thick knobs (as in fig. 6, 

 Plate VII). 



Found at the Lake of the Woods, with the series of forms .of, 

 G. multispinosa figured on the same plate. 



Mniobia obtusicornis sp.n. Plate VIII. figs. loa-13d. 



Specific characters. — Large, stout; corona less than trunk; an- 

 tenna short; jaw with thick coloured border, teeth 3/3 or 3+1. 

 Foot 4-jointed ; spurs small, rounded, separated by broad convex 

 interspace ; last joint expanded into a broad collar surrounding the 

 reniform disc which represents the toes. 



Length, when feeding, 500//-, width of corona 120 fi, neck 75 p, 

 trunk 150 /m, across spurs 30 /a. Sulcus as wide as disc. Collar 

 not very prominent ; lobes on upper lip not reaching as high as 

 bridge. Antenna half of neck width. Trunk broadly plicate ; 

 pale yellow. Stomach wall with yellow globules of moderate size. 

 Spurs stippled. In certain positions the interspace is obliterated, 

 and they have the appearance shown in fig. 13d. 



The form of spurs and the expanded last segment of the foot 

 distinguish this from all other species of Mniobia. The foot is 

 similarly expanded in a Canadian Callidina, C. asperula, described 

 in this paper. Doubtless it is used as a sucker, to ^ive support to 

 the foot-disc. 



Habitat. — Victoria, B.C. ; very abundant. 



Mniobia montium sp.n. Plate VIII. figs. 14a, 14Z>. 



Specific characters. — Large, slender, hyaline. Corona narrow 

 with small deep sulcus. Collar very prominent ; lobes on upper 



