Ganctdian Rotifera. By J. Murray. 293 



cilia long, usually projecting from mouth as two pencils when the 

 animal is creeping ; antenna one-quarter to one-third of neck width. 



When feeding, the trunk has the flask shape common to tube- 

 dwellers, the foot being quite hidden. No doubt it is a tube- 

 dweller, though it has never been seen in a tube. The pellucid 

 dots on the trunk are exceptionally large and regular ; they do 

 not extend on to the neck. Egg of 75//, by hh p. 



It is not necessary to compare it in detail with other species. 

 The elongate head, prominent mouth-margin and dotted skin are 

 sufficient to distinguish it from those species which come nearest 

 to it. 



Habitat.— Ottawa, ; very abundant. 



Cercbtotrocha cornigera ( Bryce). 



The known range of this remarkable species is rapidly extend- 

 ing. It is now known in Spitsbergen, Scotland, Ireland, Australia, 

 and Canada. It appears to have a preference for mountains : in 

 Scotland it is commonest on mountain-tops, and in Australia and 

 Canada it occurred at high levels. 



Adineta longicornis Murray. 



The range of this species is proving extensive, chiefly in warm 

 countries, but now recorded for New Zealand, the Antarctic, and 

 Canada. 



Doubtful Species. 



Marked with an asterisk (*) in the list. 



Philodina socialis H. S. M. — diagnosis extracted from key : 

 " not colourless, white ; antenna, 2-jointed ; foot, 6-jointed ; toes, 4 ; 

 spurs, large, stout ; eyes 2, cervical. In flocculent colonies."f 



Judging from the name it might be supposed that this was an 

 attempt to put Kellicott's Callidina socialis in its proper genus 

 with a fuller description ; but it is not said to be parasitic, and it 

 has cervical eyes. Unfortunately, this description, fairly good as 

 far as it goes, is not accompanied by a figure. There is nothing to 

 suggest that it might not be Philodina commensalis ! 



P. (Dissotroclui) imnnosa Bailey. The figure leaves little doubt 

 that this is D. macrostgla, the " tubercled " form. 



Callidina rediviva Ehr. Ehrenberg's diagnosis was sutficientlv 

 vague, and he appears to have been willing to identify the species 

 from contracted examples showing nothing distinctive. 



C. socialis Kell. Unfortunately Keilicott snves no fk f ure and 

 Ins description is not full enough to enable us to assign it to a 

 genus, now that the genus Embata has been separated, and the 

 Callidime distinguished from the Philodina' primarily by the 

 number of toes. The parasitic habit and the characters given 



t Craig, Proc. Nat. Sci. Assoc, Stateu Inland, xviii. (1896). 



