SOME SOUTH AMERICAN ROTIFERS 



JAMES MURRAY 



The undernoted rotifers were obtained from moss kindly sent 

 to me by Mr. N. D. F. Pearce, of Cambridge, England, in the 

 early summer of 1906. The moss was sent from British Guiana. 

 The locality from which it came was unknown, but it was some- 

 where in the interior. 



A portion of the moss was still moist, but most of it had been 

 dried. The majority of the species were got from the dried moss. 



As is usual when dried moss is examined after a lapse of some 

 time, most of the rotifers found belonged to the order Bdelloida. 

 Of this order 13 species were distinguished; 11 of the species were 

 already known, most of them being common and widely distributed 

 species. One, Callidina perforata,^ was only recently discovered 

 in India, and a very distinct variety occurred more abundantly 

 than the type. C. multispiriosa was represented by a variety, 

 probably of specific value. Two new species are here described. 



Four species of the order Ploima were also found, — one Colurus, 

 two Monostyla, — and one Diglena. I was unable to determine 

 any of these. 



Callidina angusticollis Murray > : O.")). - \'crv abimdaut. All the 

 examples hcloiii^tMl to thr type, or to a small variety. The Indian 



C. perforata Murray. -Tlu' most ahimdam sju-cies in the col- 

 lection. The type ( Fio-. 1 ) was fairly plentiful, l)ut a variety, 

 described l)elo\v, was much more so. 



C. p. var. amsricana var. iiov. (Figs. 2-3).— Case smaller than 

 in the type, length Klli ityj)e al)()ut 13() /<). Posterior process 



Micr. Soc., 1906. 



