45 Canadian Arctic Expedition, 1918-18 
Diaschiza forficata (Ehrenberg). 
Diaschiza caeca Dixon-Nutraut and Freeman, Journ. Royal Micr. Soc., 
1903, p. 134, pl. 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 (Miller). 
‘ Diglena forcipata Hupson and Gosse, Rotifera, 1886, vol. 2, p. 50, pl. 19, 
g. 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 
