Robertson discovers a Gem. 353 



they had derived from Mr. Robertson. He had 

 most kindly, they say, placed at their disposal his 

 very extensive collection of ostracoda, including 

 some undescribed forms, and under the heading of 

 " Candona euplectella, Robertson, M.S.," they observe 

 that " Specimens of Candona euplectella, in fine con- 

 dition, and exhibiting in perfect order the reticulated 

 surface, tubercles and stiff hairs, excel in beauty all 

 other European freshwater ostracoda." 



Of the new species, Erpetocypris Robertsoni, they 

 say, " Erpetocypris Robertsoni has been found only 

 in two localities, Hayston Dam, near Peebles, and in 

 the river at Portree, Isle of Skye. In both places it 

 was taken by our friend Mr. David Robertson, after 

 whom we have much satisfaction in .naming it." 



In explaining the distribution of the different 

 species, these authors give the names of the writers 

 who are responsible for the various localities, except 

 when the responsibility rests with themselves or one 

 other authority. In these three instances they give 

 only initials. Some wonder might be felt why they 

 should extend this modest reserve, natural enough in 

 regard to their own names, to one and only one other 

 of the numerous authorities they cite. The explana- 

 tion is clear, that in using the initials D. R., which 

 occur repeatedly throughout the volume, .they are re- 

 garding their honoured friend and constant helper, 

 David Robertson, as one of themselves and practically 

 a partner in their work. 



It is interesting to notice that acknowledgments of 

 the same kind as those that are being made to Mr. 

 Robertson at this very day were being made to him a 



2 A 



