178 i THE MICROSCOPICAL NEWS. 
like that Rotifer; anteriorly, it has two lateral spines, and is 
excised posteriorly for protrusion of tail foot. This is short and 
stout (not at all like the Brachionean tail foot), and is terminated 
by rather long decurved stout toes. The last form is one which 
recalls Pleurotrocha constricta, as it has a constriction immediately 
behind the head ; but it is as large again as that Rotifer,—and like 
it very active. In its general organization, it is Hydatinean ; and 
(han 
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SLO Gy ee 
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Fig. 25a. 
having a short foot, and two long recurved toes, nearly as long as 
its body. I should be inclined to consider it as Votommata 
Tigris; but Pritchard states that the toes of this species are 
curved downwards. One’s greatest difficulties in classification 
most frequently occur among Rotifers of the family Hydatinea, 
many of them being minute, rarely occuring, and imperfectly 
described in our present Text-books. 
