The Genus " Robertsonia" 351 



Again, in thanking a few of his eminent scientific 

 friends for the aid they had given him in the prepara- 

 tion of his monograph, Dr. Brady says, " Especially 

 are my acknowledgments due to Mr. David Robert- 

 son, to whom for kind and ever active help during 

 many pleasant excursions, as well as for gifts of 

 numerous valuable gatherings of copepoda, I am 

 very largely indebted." The names which follow are 

 those of Norman, E. C. Davison, Sir John Lubbock, 

 Dr. Claus, and M. T. Thorell, a group with which 

 most naturalists would feel it an honour to be 

 associated. 



On May 18, 1879, Dr. Brady wrote to his friend, 

 " I have in my hands proofs of the second copepoda 

 volume, and, as I have given one of my genera your 

 name, Robertsonia^ it just occurs to me to ask if you 

 know of the name having been used by any other 

 author. It is quite likely that some of your friends 

 may have been beforehand with me in adopting 

 your name, and if so, of course my genus could not 

 stand. Please let me know." 



It appeared that the name had not previously been 

 used in science, and accordingly Dr. Brady paid his 

 friend the compliment of instituting the genus as 

 proposed, for a species called Robertsonia tenuis. In 

 the same volume he named a new species Mesochra 

 Robertsoni t with the remarks, " This I know only 

 from Irish specimens. It occurred in gatherings taken 

 by Mr. Robertson and myself in Lough Enask and 

 Lough Arddery (two of the small lakes of Conne- 

 mara), and abundantly in a brackish ditch near New- 

 port, co. Mayo, Ireland, where it was found by Mr. 



