4 E Canadian Arctic Expedition, 1913-18 



Diaschiza forficata (Ehrenberg). 



Diaschiza caeca DIXON-NUTTALL and FREEMAN, Journ. Royal Micr. Soc., 

 1903, p. 134, pi. 4, fig. 11. 



Abundant in a collection made by Johansen from a pond on the ridge at 

 Bernard harbour, on July 3, 1916. 



Diaschiza gracilis (Ehrenberg). 



Common among algae growing on stones in river bed at Bernard harbour, 

 August 16, 1915; abundant in ponds on the ridge at Bernard harbour, July 

 3, 1916. Both collections were made by Johansen. 



Diaschiza gibba (Ehrenberg). 



In a collection made by Johansen from ponds on the ridge at Bernard 

 harbour, July 3, 1916, rare. In Jessup's collections from a muskeg lake, 28 

 miles north of New Rampart House, June 25, 1911, rare; lakes on Old Crow 

 river flats, 40 miles north of New Rampart House, July 3, 1911, few; lakes 

 along the International Boundary, 48 miles north of New Rampart House, 

 July 7, 1911, few; pools at Fort Yukon, May 24, 1912, rare. 



Dicranophorus forcipatus (Miiller). 



Diglena forcipata HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 50, pi. 19, 

 fig. 2. 



Collected by Johansen among algae growing on stones in the river bed at 

 Bernard harbour, August 16, 1915, few; by Jessup from lakes on Old Crow 

 river flats, 40 miles north of New Rampart House, July 3, 1911, few. The 

 trophi of these Arctic specimens have only five large, relatively blunt, teeth 

 in each ramus, while the typical form has eleven or twelve. It is possible 

 that they may represent an undescribed species ; the partly contracted material 

 was not in such a condition as to make this clear. 



Encentrum algente, new species. 

 Plate I, figs. '1, 2. 



The body is elongate and very slender, almost vermiform; the integument 

 is soft and flexible and the animal highly contractile. 



The head is small and cylindric, its diameter somewhat less than that 

 of the abdomen, from which it is separated by a slight constriction at the level 

 of the gastric glands. The abdomen is cylindric nearly its entire length; pos- 

 teriorly it is slightly reduced at its junction with the foot, which has two joints 

 of nearly equal length. The toes are short, about one twentieth of the entire 

 length, blade-shaped and slightly decurved, with slender, acute points. 



The corona is terminal; the lateral, marginal cilia are somewhat longer 

 than the rest and form rudimentary auricles. The dorsal antenna is a small, 

 ciliated pit in the normal position; the lateral antennae are on the posterior 

 fourth of the abdomen. 



The trophi are forcipate and of a rather unusual type. The rami are of the 

 normal lyrate form, terminating in a strong, pointed tooth; on the inner edge, 

 about mid-length, there is an additional fairly large, pointed tooth. The 

 fulcrum is unusually well developed, its length being fully equal to the length 

 of the rami. The unci are aberrant; a single, short and robust tooth, hinged 

 to the ramus at mid-length on a knob-like epiphysis, appears to represent the 

 uncus proper; it is connected to the manubrium through a rather slender bar, 

 enlarged at the posterior end, and nearly as long as the tooth itself. The 



