1'is Transactions of the Society. 



Callidina armillata sp. n., pi. IV. figs. 2a-2d. 



Specific Characters. — Small, hyaline ; corona large ; sulcus wide ; 

 collar produced laterally as broad hyaline band, joining the margin 

 Of the mouth ; antenna short; teeth 2 -f- 1 ; jaw with broad wing; 

 foot 4-jointed ; spurs very small cones, interspace wide ; lumen of 

 stomach wide; toes small. 



Length, feeding, 300 /x; width of corona 80 fx, collar 70 yu., neck 

 50 fi, trunk 70 fx, across spurs 22 /x. The broad hyaline collar pro- 

 jects beyond the cheeks, but it is somewhat mobile, and varies in 

 amount of expansion. Antenna equal to half the neck-width. The 

 lumen is of unusnal width for a Callidina. but there is no resem- 

 blance to the pellet-makers (Habrotrocha), which have the lumen 

 wide. 



The expanded collar distinguishes C. armillata from all known 

 Bdelloids. It has its only close relatives in C. lepida (described in 

 this paper) and C. microcornis, a New Zealand species. These have 

 similar minute, widely separated spurs, and wide lumen. 



Habitat. — Katoomba, New South Wales, frequent. 



Callidina lepida sp. n., pi. IV. figs. 3a, 3b. 



Specific Characters. — Small, hyaline ; corona wide, sulcus shallow ; 

 collar prominent ; antenna short ; teeth 2 ; anal segment short, with 

 lateral prominences ; foot short, 3-jointed ; spurs short cones, with 

 wide interspace; stomach lumen wide. 



Length, feeding, 230 yx; width of corona 60 fx, neck 32 /j,, trunk 

 70 /x, spurs l-I ll. Upper lip not lobed, not as high as bridge, bearing 

 a median "ligule." Central setre on disks. Margins of mouth ex- 

 panded, showing beyond cheeks. Trunk closely plicate. Antenna 

 equal half neck-width. Pre-anal and anal segments distinct. 



Most resembling C. armillata, it differs in not having the collar 

 connected with the expanded mouth margin, in the unlobed upper 

 lip, and the cuneate anal segment. The jaw has not a broad wing. 



Habitat. — Katoomba, Blue Mountains. 



EXPLANATION OF PLATE V. 



-Callidina sernilata sp. n. 



-Ditto. Ditto. Jaw. 



-Callidina mirabilis sp. n. 



-Ditto. Ditto. Head and neck. 



-Ditto. Ditto. Antenna. 



-Ditto. Ditto. Jaw. 



-Callidina ? species ? 



-Ditto. Ditto. Jaw. 



-Callidina multispinosa (Thomp.). Form from Queensland. 



-Ditto. Ditto. Form from Katoomba. 



-Rotifer montanus Murray. Spurs of Australian variety. 



-Callidina formosa Murray. Egg. 



