86 D. BRYCE ON A NEW CLASSIFICATION OF THE BDELLOID ROTIFERA. 



the Scottish specimens must be referred to the Philodina collaris 

 of Ehrenberg, a species hitherto unrecognised. It is unfortunate 

 that with regard to this very species Ehrenberg was unable to 

 state the number of teeth, as this detail v/ould have been of 

 great value. But I rely less upon the general details given of 

 P. collaris than upon the description and figure of the stomach, 

 which prove clearly enough that this species was a pellet-maker, 

 and had a stomach with the wide lumen usual among pellet- 

 making forms. 



The Scottish species is the only pellet-maker known which 

 has two eyes in the neck, or, to locate them more precisely, 

 in the brain, and it further agrees with Ehrenberg's description 

 in having a small corona, and in the eyes being round. I did 

 not observe in my own specimens that there was any distinct 

 sw^elling of the neck such as Ehrenberg describes ; but he appears 

 to indicate that annulus-like thickening of the skin of the post- 

 oral segment which is noticeable in many species. As these 

 are nearly all pellet-making forms, this detail supports my view 

 that P. collaris was a pellet-maker. In accordance with that 

 view, and in the belief that the Scottish specimens are more 

 correctly to be assigned to P. collaris, I have included Ehren- 

 berg's species as recognisable, and placed P. hexodonta among 

 those which are insufficiently described. 



It seems probable that the specimens which Bilfinger (68) 

 assigned to P. hexodonta were similar to the Scottish examples. 



6. Rotifer hapiiciis Gosse. Neither Murray nor myself has 

 met with any species which rivals P. macroceros in the length 

 of the dorsal antenna but lacks the tapping motion character- 

 istic of the latter form. Bat the whole description given by 

 Gosse is so lacking in definite detail that there can be no question 

 of its insufficiency. Indeed, the whole central group of the 

 genus Rotifer, viz. E. vidgaris and its nearer relations, amongst 

 which R. hapticas is probably to be reckoned, stands greatly 

 in need of a much more critical examination than it has yet 

 received. 



7. Callidina hihamata Gosse. The value of the description 

 of this species rests solely upon the reality of the two " hooks " 

 at the apex of the rostrum. It seems certain that the supposed 

 " hooks " were simply the lateral presentment of the rostral 

 lamellae, possessed more or less conspicuously by every Bdelloid 



