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ON A NEW BDELLOID ROTIFER, C ALU DIN A 



VESICULARIS. 



By James Murray. 



{Read December 15th, IDC 5.) 



Plate 18. 



In September, 1904, Mr. Bryce sent me some samples of moss, in 

 order to show me Callidina aculeata, Milne, and C. vorax, Janson, 

 two species with which I was not then acquainted. I was able 

 to find examples of both of them. In the moss which contained 

 C. aculeata I found also several specimens of a Bdelloid quite 

 distinct from any species known to me. The animal was carefully 

 studied, as far as the limited number of examples permitted. 

 Mr. Bryce was immediately notified of the occurrence of the 

 species in his moss, in the hope that he also would be able to 

 study it. Unfortunately he was unable to find it, and up to the 

 present has not detected a single example, nor have I, on further 

 examination of the material, been any more fortunate. 



We have therefore to depend solely on the observations made 

 on the original three specimens. 



As the species is a very well-marked one, easily distinguished 

 from all other Bdelloids of which we have sufficient descriptions, 

 and Mr. Bryce has not himself seen it, I venture to make a 

 description of it. 



Callidina vesicularis, n.sp. 



Specific characters. — Large, hyaline ; teeth, 6/5 ; vibratile tags, 



six pairs, very large, round or pyriform ; first foot-joint with two 



blunt processes, spurs small, separated by wide interspace. 

 Journ. Q. M. C, Series II.— No. 58. 19 



