JOUENAIj 



OF THE 



KOYAL MICROSCOPICAL SOCIETY. 



AUGUST, 1913. 



TRANSACTIONS OF THE SOCIETY. 



XI. — South Amei'ican Rotifer a. Part II. 

 By James Murray, F.E.S.E. 



(Read April 16, 1913.) 

 Plates XIII, XIV, XV. 



Order PLOIMA: LOBICATA. 



Family Cathypnid^. 



In dealing with this family I have felt it necessary to figure, as 

 far as possible, every species observed. The family has suffered 

 more than most from careless work, so that in many cases the 

 mere recording of a name conveys no idea of the animal observed. 

 In the three genera, Monostyla, Distyla and Cathypna, I know of 

 eighty alleged species which have been described. Many of these 

 do not even belong to the family ; many are based on trifling 

 differences ; many are insufficiently described ; very many are 

 simply synonyms which their authors would have avoided creating 



EXPLANATION OF PLATE XIII. 



Fig. 18a.. — Cathy pna minnesotensis. Dorsal view. 

 186. Ditto. Side of foot. 



19. — C. lima. Dorsal view. 

 20a. — C. grandis sp. n. Dorsal view. 

 206. Ditto. Ventral view of foot. 



21a. — C.leontina. Dorsal view. 



216. Ditto. Side of lorica, showing frontal plates. 



21c. Ditto. Variety ; dorsal view. 



(All figures magnified 260 diam.) 

 Aug. Wth, 1913 2 A 



