436 



Further Notes on Macrotrachelous Callidin^. 



By David Bryce. 



{Bead September 21st, 189L) 



Plates XXIII. and XXIV. 



This third paper on this group of Callidin^e has for its principal 

 object the description of 10 species not referred to in my earlier 

 notices. 



Since I read to the Society the second of these, there has been 

 added to the rapidly swelling list of Rotifer literature a very 

 important contribution by Dr. Janson/ dealing exclusively with 

 the Ehrenbergian family, Philodina^a, that is to say, with the genera 

 included in Hudson and Gosse's sub-order Bdelloida. I do not 

 propose here to fully enumerate the contents of this treatise, a 

 copy of which the author very courteously presented to our 

 library, and to which each of us has, therefore, convenient access, 

 but merely to point out to our members, in general and apprecia- 

 tive terms, the scope and usefulness of the work, which is 

 admirably planned, and presents to us in a very compact form a 

 mass of information upon the genera included. It was high time 

 that such a monograph should be put forward, more especially as 

 regards the genera Callidina and Adineta, which have received so 

 many additions in these recent years. In all 52 species are 

 admitted as valid, of which Rotifer has 13 (including two species 

 previously known under the generic name Actinurus), Philodina 

 8, Callidina 25, Discopus 1, and Adineta 5. In addition to 

 the specific characters of each of these forms. Dr. Janson 

 provides a general key for their identification, which will to some 

 extent facilitate this puzzling task. Tiiere is also a bibliography 

 in continuation of those published by Dr. Zelinka in 1886 and 

 1888, and carried up to September, 1892. My descriptions of 

 Call, pusilla, Call, cormgera, and Adineta clauda were not put 

 forward until after that date, and consequently these species are 

 not among the 52 species admitted, and have to be added, as are 



