Rotifera of New Zealand. By J. Murray. 577 



Pleuretra brycei (Weber). Plate XVI. figs. 2a-2c. 



Variety. — Spines on anterior margin of trunk small, median 

 furca short. Lateral spines (in front of first dorsal row) one at 

 each side ; first dorsal row ten ; second, third, and fourth dorsal 

 rows of four spines each. The fourth row is on the rump. Skin 

 papillose, papillae with central dots. Spurs not seen. 



This variety, which is only known in New Zealand, has more 

 transverse dorsal rows of spines than any other variety. It is 

 also peculiar in having four spines in the last row (on the rump). 

 Most forms have only two. Only a Canadian form, and a distinct 

 species (P. africana), have four spines on the rump. It is curious 

 that with the great development of the dorsal spines^ the lateral 

 spines are reduced in number, and the anterior ones in size. 



Callidina microcornis sp. n. Plate XVI. 

 figs. 4a-4c. 



Specific Characters. — Of moderate size, stout ; corona less than 

 trunk ; rostrum short ; antenna f of neck width ; teeth 2 ; stomach 

 with wide lumen ; foot short, 3-jointed ; spurs minute points, with 

 wide convex space. 



Length, feeding, 300/a, width of corona 85 /a, trunk 100 fi, across 

 spurs 24 /x. Sulcus less than disk ; collar slightly prominent. Jaw 

 triangular, with thick border. 



The very minute spurs are like those of C. armillata and C. 

 lepida, which also have the wide lumen. It has not the hyaline 

 collar of armillata, nor the knobbed anal segment of lepida. 



Habitat. — West Coast, S. Island ; Australia. 



^Callidina papillosa (Thomp.). 



The New Zealand form is like the smaller Canadian form (figured 

 in another number of this Journal), which is near the type, but has 

 more numerous warts on the trunk. 



Callidina multispinosa (Thomp.). Plate XVI. 

 figs. 5a, 5b. 



Variety. — Long-spined ; teeth 3 + 2 or 4 + 1 ; five stout spines 

 on each side of anterior trunk ; a dorsal series of spicules across 

 widest part of central trunk ; a spicule in the angle of junction of 

 first and second anterior segments of trunk ; several lateral spicules 

 on central trunk and on rump. 



The only form of the species observed in New Zealand ; it is 

 also present in Australia, and is confined to Australasia. 



