M. F. DUNLOP ON A NEW ROTIFER, CATHYPNA LIGONA. 31 



toes, which are then mostly turned towards the head. The 

 head when exserted is inchned downwards. The species is 

 readily distinguished by the peculiarly-shaped appendage already 

 referred to, and as the form suggests a spade-like appearance 

 it is proposed to call it Cathypna ligona (L. ligo, a spade). 



I am indebted to Mr. C. F. Rousselet for the followinsr 

 remarks on this new species. He says it " has close relatives. 

 The nearest in shape, with a posterior square-shaped appendage, 

 is Monostyla lamellata, found by Dr. Daday * in salt marshes 

 in Hungary, and again found in Russia by A. Skorikow, who 

 gave it a new name — Monostyla (q^j^endiculata ; but this animal 

 has a single toe and is a true Monostyla. Then, in 1892, 

 Anderson and Shephard (Notes on Victorian Kotifers) described 

 a new species under the name of Distyla icththyoura, but which 

 is really a Cathypna^ which has a smaller posterior appendage. 

 About the same time in 1892 the same animal, or a slight 

 variety of it, was described from America by C. H. Turner f 

 under the name of Cathypna leontina, and in 1894 it was 

 once more found in Finland by Dr. Levander, t and described as 

 a new species under the name of Cathypna apjjendiculata." 



I regret that, unfortunately, I was only able to mount one 

 specimen, and that with its head retracted. I found a large 

 number of empty loricae, which shows that the animal was fairly 

 plentiful, and had I known earlier that it was new, I might 

 have had several living specimens for observation. Mr. Dixon- 

 Nuttall, however, has with his usual felicitous touch drawn a 

 correct likeness of the mounted specimen which is reproduced 

 in the accompanying plate. 



I have to thank. Mr. Dixon-Nuttalk for his delineation, and 

 also Mr. Rousselet and Mr. Hood for the aid they have 

 given me. 



* E. V. Daday. Beitrage ziir Kenntniss der Microfaima der Natronwasser 

 des Alfoldes. Math. u. Naturw. Berichte aus Urigarn XI. 1893, 



t C. H. Turner. Notes upon the Cladocera, Copepoda, Ostracoda, and 

 Eotifera of Cincinnati. Bulletin Denison University VI. 1892. 



X K. M. Levander. Materialen zur Kenntniss der Wasserfauna der 

 Umgebung von Helsingfors. Acta Societatis pro Fauna et Flora Fennica 

 XII. 1894. 



