DAVID BRYCE ON THREE NEW SPECIES OF CALLIDINA. 367 



some species only very slightly marked, as, for instance, in the 

 genus Rotifer and in Philodina citrina and some others, but more 

 usually there is a quite distinct furrow or notch, and in many 

 species the lobes are separated by a relatively wide interspace, 

 more or less flat. 



To the general rule that Philodinidae with a tube-like lumen 

 have a bilobed upper lip, perhaps the best-known exception is 

 "Callidina Ehrenhergi, whose high upper lip forms a single lobe 

 with rounded front. C. nana sp. nov., is likewise an exception, 

 and in other respects shows some appearance of close relationship 

 to C. Ehreitberyi. 



Another exception is found in C. decora sp. nov., which, unlike 

 C. luma, has widely separated pedicels, but the upper lip rises so 

 slightly as to leave uncovered the nexus between their bases. 



The third new species, C. concinna, conforms strictly to the 

 rule indicated, the high upper lip being, I think, quite distinctly, 

 though not deeply, notched. 



Of these three species, only C. decora appears to be uncommon. 

 I have found both the others on several occasions. C. concinna 

 is representative of a series of " races," which agreed in the 

 characters specified, but varied somewhat in their size and other 

 iletails insufficiently important to justify their separation. 



The figures of the new species were first drawn to a scale 

 equalling x 800, but have been reduced to the equivalent of x 530. 



The numbers after names of authors refer to the Bibliography 

 appended to my paper on " A New Classification of the Bdelloid 

 Rotif era " {Journ. Quek. Micr. Cluh^ Ser. 2, Vol. XI. p. 61). 



Callidina nana sp. nov. (PI. 12, Fig. 2). 



Specific Characters. Corona rather narrower than collar ; 

 pedicels distinct, closely proximate ; upper lip rising nearly as 

 high as discs, narrow, undivided, rounded. Rami with two 

 teeth each. Foot short, of three segments ; spurs short acute 

 cones, with little or no interspace. Egg with moderately 

 numerous short blunt spines. 



A small and somewhat slender form not uncommon in ground 

 mosses, and occasionally met with in Sphagnum. When creeping 

 about it has much the appearance of a small Habrotrocha, the 

 head and rostrum being a little more elongate than is usual in 



