242 



EOTIFERA. D. S. KeLLICOTT. 



I received in September three vials of plankton, from Mr. Chancey Judaj 

 with the request to report upon the Rotifera found therein. The vials Avere 

 marked and described as follows : " I. Contains plankton caught at the surface 

 of the water of Wawasee Lake, Indiana, by using a plankton net; taken August 

 28, 1895 ; killed in picro-sulphuric acid ; washed in 35 per cent, and 50 per cent, 

 alcohol and preserved in 85 per cent, alcohol." "II. Depth of haul, 60 feet 

 (Wawasee) ; depth of water, 65 feet; taken July 20, 1895; killed in Flemming's 

 Fluid; washed in 35 per cent, and 50 per cent, alcohol, and preserved in 85 per 

 cent, alcohol." "III. From Tippecanoe Lake ; depth of haul, 110 feet; depth 

 of water, 117 feet ; taken August 7, 1895; killed in Flemmings's Fluid; washed 

 in 35 per cent, and 50 per cent, alcohol, and preserved in 85 per cent, alcohol." 



I find that the Rotifera were much better preserved in II and III than in the 

 first. The illoricate species in I were scarcely recognizable ; in fact three species 

 found in this vial I have not been able to place more nearly than the probable 

 genus. Those in II and III have all been satisfactorily identified. While the 

 whole number recognized in these collections is not large some interesting facts 

 are brought to light. Three species not hitherto reported from this country are 

 among the number, and others rarely. It is certain that the rotijeral fauna of 

 these lakes is rich and will yield many unique forms as a reward to any student 

 who may be able to work in the region, to take and study them in the fresh state, 

 and in all their varied relations and situations of residence. 



I shall enumerate, with remarks, the species found in each haul separately, 

 although it will cause some repetition, and in the order of Hudson and Gosse's 

 Rotifera, without citing the bibliography farther than a description where the par- 

 tial bibliography, however, will usually be found. 



1. Floscularia mutabilis Bolton. Not infrequent. It is quite unexpected 

 that a floscule should occur among pelagic species, and yet there are four known 

 species of these Rhizota that cut loose and become sailors. Mr. H. S. Jennings 

 has found three of them in St. Clair and lakes of Michigan. Of this one he says: 

 " Very common in to wings from Lake St. Clair, either at the surface or near the 

 bottom. Hudson and Gosse, I, 56. 



2. Qucist£s brachiatm Hudson. A large number were found, but it was im- 

 possible to identify them surely. The tube conforms to the figures and descrip- 

 tions of that of Bruchiatus ; it is cylindrical, smooth, compact, perfectly hyaline, 



